Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar

Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, dow...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Muhammad eShahbaz [verfasserIn] Karl eRavet [verfasserIn] Graham ePeers [verfasserIn] Marinus ePilon [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2015

Schlagwörter:	Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase

Übergeordnetes Werk:	In: Frontiers in Plant Science - Frontiers Media S.A., 2011, 6(2015)
Übergeordnetes Werk:	volume:6 ; year:2015

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.3389/fpls.2015.00407

Katalog-ID:	DOAJ030011140

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author_variant	m e me k e ke g e ge m e me
matchkey_str	article:1664462X:2015----::roiiainfoprotesipooyteieetotasotneeo
hierarchy_sort_str	2015
callnumber-subject-code	SB
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allfields	10.3389/fpls.2015.00407 doi (DE-627)DOAJ030011140 (DE-599)DOAJb3da9faf89654978b1d41705c4495f82 DE-627 ger DE-627 rakwb eng SB1-1110 Muhammad eShahbaz verfasserin aut Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression. Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase Plant culture Karl eRavet verfasserin aut Graham ePeers verfasserin aut Marinus ePilon verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 6(2015) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:6 year:2015 https://doi.org/10.3389/fpls.2015.00407 kostenfrei https://doaj.org/article/b3da9faf89654978b1d41705c4495f82 kostenfrei http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00407/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2015
spelling	10.3389/fpls.2015.00407 doi (DE-627)DOAJ030011140 (DE-599)DOAJb3da9faf89654978b1d41705c4495f82 DE-627 ger DE-627 rakwb eng SB1-1110 Muhammad eShahbaz verfasserin aut Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression. Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase Plant culture Karl eRavet verfasserin aut Graham ePeers verfasserin aut Marinus ePilon verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 6(2015) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:6 year:2015 https://doi.org/10.3389/fpls.2015.00407 kostenfrei https://doaj.org/article/b3da9faf89654978b1d41705c4495f82 kostenfrei http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00407/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2015
allfields_unstemmed	10.3389/fpls.2015.00407 doi (DE-627)DOAJ030011140 (DE-599)DOAJb3da9faf89654978b1d41705c4495f82 DE-627 ger DE-627 rakwb eng SB1-1110 Muhammad eShahbaz verfasserin aut Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression. Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase Plant culture Karl eRavet verfasserin aut Graham ePeers verfasserin aut Marinus ePilon verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 6(2015) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:6 year:2015 https://doi.org/10.3389/fpls.2015.00407 kostenfrei https://doaj.org/article/b3da9faf89654978b1d41705c4495f82 kostenfrei http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00407/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2015
allfieldsGer	10.3389/fpls.2015.00407 doi (DE-627)DOAJ030011140 (DE-599)DOAJb3da9faf89654978b1d41705c4495f82 DE-627 ger DE-627 rakwb eng SB1-1110 Muhammad eShahbaz verfasserin aut Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression. Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase Plant culture Karl eRavet verfasserin aut Graham ePeers verfasserin aut Marinus ePilon verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 6(2015) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:6 year:2015 https://doi.org/10.3389/fpls.2015.00407 kostenfrei https://doaj.org/article/b3da9faf89654978b1d41705c4495f82 kostenfrei http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00407/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2015
allfieldsSound	10.3389/fpls.2015.00407 doi (DE-627)DOAJ030011140 (DE-599)DOAJb3da9faf89654978b1d41705c4495f82 DE-627 ger DE-627 rakwb eng SB1-1110 Muhammad eShahbaz verfasserin aut Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar 2015 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression. Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase Plant culture Karl eRavet verfasserin aut Graham ePeers verfasserin aut Marinus ePilon verfasserin aut In Frontiers in Plant Science Frontiers Media S.A., 2011 6(2015) (DE-627)662359240 (DE-600)2613694-6 1664462X nnns volume:6 year:2015 https://doi.org/10.3389/fpls.2015.00407 kostenfrei https://doaj.org/article/b3da9faf89654978b1d41705c4495f82 kostenfrei http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00407/full kostenfrei https://doaj.org/toc/1664-462X Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 6 2015
language	English
source	In Frontiers in Plant Science 6(2015) volume:6 year:2015
sourceStr	In Frontiers in Plant Science 6(2015) volume:6 year:2015
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase Plant culture
isfreeaccess_bool	true
container_title	Frontiers in Plant Science
authorswithroles_txt_mv	Muhammad eShahbaz @@aut@@ Karl eRavet @@aut@@ Graham ePeers @@aut@@ Marinus ePilon @@aut@@
publishDateDaySort_date	2015-01-01T00:00:00Z
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callnumber-first	S - Agriculture
author	Muhammad eShahbaz
spellingShingle	Muhammad eShahbaz misc SB1-1110 misc Photosynthesis misc Plastocyanin misc Superoxide Dismutase misc poplar misc prioritization misc Polyphenol oxidase misc Plant culture Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar
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topic_title	SB1-1110 Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar Photosynthesis Plastocyanin Superoxide Dismutase poplar prioritization Polyphenol oxidase
topic	misc SB1-1110 misc Photosynthesis misc Plastocyanin misc Superoxide Dismutase misc poplar misc prioritization misc Polyphenol oxidase misc Plant culture
topic_unstemmed	misc SB1-1110 misc Photosynthesis misc Plastocyanin misc Superoxide Dismutase misc poplar misc prioritization misc Polyphenol oxidase misc Plant culture
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title	Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar
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title_full	Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar
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title_sort	prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar
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title_auth	Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar
abstract	Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression.
abstractGer	Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression.
abstract_unstemmed	Plastocyanin is an essential and abundant copper protein required for photosynthesis in higher plants. Severe copper deprivation has the potential to cause a defect in photosynthetic electron transport due to a lack in plastocyanin. The Cu-microRNAs, which are up-regulated under Cu deficiency, down-regulate the expression of target Cu proteins other than plastocyanin, cytochrome-c oxidase and the ethylene receptors. It has been proposed that this mechanism saves Cu for plastocyanin maturation. We aimed to test how hybrid poplar, a species that has capacity to rapidly expand its photosynthetically active tissue, responds to variations in Cu availability over time. Measurement of chlorophyll fluorescence after Cu depletion revealed a drastic effect on photosynthesis in hybrid poplar. The decrease in photosynthetic capacity was correlated with a reduction in plastocyanin protein levels. Compared to older leaves, plastocyanin decreased more strongly in developing leaves, which also lost more photosynthetic electron transport capacity. The effect of Cu depletion on older and more developed leaves was minor and these leaves maintained much of their photosynthetic capacity. Interestingly, upon resupply of Cu to the medium a very rapid recovery of Cu levels was seen in the younger leaves with a concomitant rise in the expression and activity of plastocyanin. In contrast, the expression of those Cu proteins, which are targets of microRNAs was under the same circumstances delayed. At the same time, Cu resupply had only minor effects on the older leaves. The data suggest a model where rapid recovery of photosynthetic capacity in younger leaves is made possible by a preferred allocation of Cu to plastocyanin in younger leaves, which is supported by Cu-microRNA expression.
collection_details	GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2003 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700
title_short	Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar
url	https://doi.org/10.3389/fpls.2015.00407 https://doaj.org/article/b3da9faf89654978b1d41705c4495f82 http://journal.frontiersin.org/Journal/10.3389/fpls.2015.00407/full https://doaj.org/toc/1664-462X
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Prioritization of copper for the use in photosynthetic electron transport in developing leaves of hybrid poplar

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