Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus)
Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Wu, Zhichao [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2015 |
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| Rechteinformationen: |
Nutzungsrecht: Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved. |
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| Schlagwörter: |
Biological Transport - genetics |
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| Systematik: |
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| Übergeordnetes Werk: |
Enthalten in: Chemosphere - Kidlington, Oxford : Elsevier Science, 1972, 119(2015), Seite 1217-1223 |
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| Übergeordnetes Werk: |
volume:119 ; year:2015 ; pages:1217-1223 |
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| DOI / URN: |
10.1016/j.chemosphere.2014.09.099 |
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| 520 | |a Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. | ||
| 540 | |a Nutzungsrecht: Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved. | ||
| 650 | 4 | |a Brassica napus - genetics | |
| 650 | 4 | |a Cadmium - metabolism | |
| 650 | 4 | |a Soil Pollutants - toxicity | |
| 650 | 4 | |a Cadmium - toxicity | |
| 650 | 4 | |a Soil Pollutants - metabolism | |
| 650 | 4 | |a Plant Roots - metabolism | |
| 650 | 4 | |a Biological Transport - genetics | |
| 650 | 4 | |a Plant Shoots - metabolism | |
| 650 | 4 | |a Brassica napus - growth & development | |
| 650 | 4 | |a Xylem - metabolism | |
| 650 | 4 | |a Brassica napus - metabolism | |
| 650 | 4 | |a Xylem - genetics | |
| 700 | 1 | |a Zhao, Xiaohu |4 oth | |
| 700 | 1 | |a Sun, Xuecheng |4 oth | |
| 700 | 1 | |a Tan, Qiling |4 oth | |
| 700 | 1 | |a Tang, Yafang |4 oth | |
| 700 | 1 | |a Nie, Zhaojun |4 oth | |
| 700 | 1 | |a Hu, Chengxiao |4 oth | |
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10.1016/j.chemosphere.2014.09.099 doi PQ20160617 (DE-627)OLC1963053583 (DE-599)GBVOLC1963053583 (PRQ)c2205-873aaa733932021263e60b07321a6d06d287d3b5840505aa87a63d8dcd089ed20 (KEY)0012464820150000119000001217xylemtransportandgeneexpressionplaydecisiverolesin DE-627 ger DE-627 rakwb eng 333.7 DNB AR 10100 AVZ rvk 38.32 bkl 35.00 bkl Wu, Zhichao verfasserin aut Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. Nutzungsrecht: Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved. Brassica napus - genetics Cadmium - metabolism Soil Pollutants - toxicity Cadmium - toxicity Soil Pollutants - metabolism Plant Roots - metabolism Biological Transport - genetics Plant Shoots - metabolism Brassica napus - growth & development Xylem - metabolism Brassica napus - metabolism Xylem - genetics Zhao, Xiaohu oth Sun, Xuecheng oth Tan, Qiling oth Tang, Yafang oth Nie, Zhaojun oth Hu, Chengxiao oth Enthalten in Chemosphere Kidlington, Oxford : Elsevier Science, 1972 119(2015), Seite 1217-1223 (DE-627)129288586 (DE-600)120089-6 (DE-576)014470187 0045-6535 nnns volume:119 year:2015 pages:1217-1223 http://dx.doi.org/10.1016/j.chemosphere.2014.09.099 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25460764 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 AR 10100 38.32 AVZ 35.00 AVZ AR 119 2015 1217-1223 |
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10.1016/j.chemosphere.2014.09.099 doi PQ20160617 (DE-627)OLC1963053583 (DE-599)GBVOLC1963053583 (PRQ)c2205-873aaa733932021263e60b07321a6d06d287d3b5840505aa87a63d8dcd089ed20 (KEY)0012464820150000119000001217xylemtransportandgeneexpressionplaydecisiverolesin DE-627 ger DE-627 rakwb eng 333.7 DNB AR 10100 AVZ rvk 38.32 bkl 35.00 bkl Wu, Zhichao verfasserin aut Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. Nutzungsrecht: Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved. Brassica napus - genetics Cadmium - metabolism Soil Pollutants - toxicity Cadmium - toxicity Soil Pollutants - metabolism Plant Roots - metabolism Biological Transport - genetics Plant Shoots - metabolism Brassica napus - growth & development Xylem - metabolism Brassica napus - metabolism Xylem - genetics Zhao, Xiaohu oth Sun, Xuecheng oth Tan, Qiling oth Tang, Yafang oth Nie, Zhaojun oth Hu, Chengxiao oth Enthalten in Chemosphere Kidlington, Oxford : Elsevier Science, 1972 119(2015), Seite 1217-1223 (DE-627)129288586 (DE-600)120089-6 (DE-576)014470187 0045-6535 nnns volume:119 year:2015 pages:1217-1223 http://dx.doi.org/10.1016/j.chemosphere.2014.09.099 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25460764 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 AR 10100 38.32 AVZ 35.00 AVZ AR 119 2015 1217-1223 |
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10.1016/j.chemosphere.2014.09.099 doi PQ20160617 (DE-627)OLC1963053583 (DE-599)GBVOLC1963053583 (PRQ)c2205-873aaa733932021263e60b07321a6d06d287d3b5840505aa87a63d8dcd089ed20 (KEY)0012464820150000119000001217xylemtransportandgeneexpressionplaydecisiverolesin DE-627 ger DE-627 rakwb eng 333.7 DNB AR 10100 AVZ rvk 38.32 bkl 35.00 bkl Wu, Zhichao verfasserin aut Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. Nutzungsrecht: Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved. Brassica napus - genetics Cadmium - metabolism Soil Pollutants - toxicity Cadmium - toxicity Soil Pollutants - metabolism Plant Roots - metabolism Biological Transport - genetics Plant Shoots - metabolism Brassica napus - growth & development Xylem - metabolism Brassica napus - metabolism Xylem - genetics Zhao, Xiaohu oth Sun, Xuecheng oth Tan, Qiling oth Tang, Yafang oth Nie, Zhaojun oth Hu, Chengxiao oth Enthalten in Chemosphere Kidlington, Oxford : Elsevier Science, 1972 119(2015), Seite 1217-1223 (DE-627)129288586 (DE-600)120089-6 (DE-576)014470187 0045-6535 nnns volume:119 year:2015 pages:1217-1223 http://dx.doi.org/10.1016/j.chemosphere.2014.09.099 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25460764 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 AR 10100 38.32 AVZ 35.00 AVZ AR 119 2015 1217-1223 |
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10.1016/j.chemosphere.2014.09.099 doi PQ20160617 (DE-627)OLC1963053583 (DE-599)GBVOLC1963053583 (PRQ)c2205-873aaa733932021263e60b07321a6d06d287d3b5840505aa87a63d8dcd089ed20 (KEY)0012464820150000119000001217xylemtransportandgeneexpressionplaydecisiverolesin DE-627 ger DE-627 rakwb eng 333.7 DNB AR 10100 AVZ rvk 38.32 bkl 35.00 bkl Wu, Zhichao verfasserin aut Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. Nutzungsrecht: Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved. Brassica napus - genetics Cadmium - metabolism Soil Pollutants - toxicity Cadmium - toxicity Soil Pollutants - metabolism Plant Roots - metabolism Biological Transport - genetics Plant Shoots - metabolism Brassica napus - growth & development Xylem - metabolism Brassica napus - metabolism Xylem - genetics Zhao, Xiaohu oth Sun, Xuecheng oth Tan, Qiling oth Tang, Yafang oth Nie, Zhaojun oth Hu, Chengxiao oth Enthalten in Chemosphere Kidlington, Oxford : Elsevier Science, 1972 119(2015), Seite 1217-1223 (DE-627)129288586 (DE-600)120089-6 (DE-576)014470187 0045-6535 nnns volume:119 year:2015 pages:1217-1223 http://dx.doi.org/10.1016/j.chemosphere.2014.09.099 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25460764 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 AR 10100 38.32 AVZ 35.00 AVZ AR 119 2015 1217-1223 |
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10.1016/j.chemosphere.2014.09.099 doi PQ20160617 (DE-627)OLC1963053583 (DE-599)GBVOLC1963053583 (PRQ)c2205-873aaa733932021263e60b07321a6d06d287d3b5840505aa87a63d8dcd089ed20 (KEY)0012464820150000119000001217xylemtransportandgeneexpressionplaydecisiverolesin DE-627 ger DE-627 rakwb eng 333.7 DNB AR 10100 AVZ rvk 38.32 bkl 35.00 bkl Wu, Zhichao verfasserin aut Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) 2015 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. Nutzungsrecht: Crown Copyright © 2014. Published by Elsevier Ltd. All rights reserved. Brassica napus - genetics Cadmium - metabolism Soil Pollutants - toxicity Cadmium - toxicity Soil Pollutants - metabolism Plant Roots - metabolism Biological Transport - genetics Plant Shoots - metabolism Brassica napus - growth & development Xylem - metabolism Brassica napus - metabolism Xylem - genetics Zhao, Xiaohu oth Sun, Xuecheng oth Tan, Qiling oth Tang, Yafang oth Nie, Zhaojun oth Hu, Chengxiao oth Enthalten in Chemosphere Kidlington, Oxford : Elsevier Science, 1972 119(2015), Seite 1217-1223 (DE-627)129288586 (DE-600)120089-6 (DE-576)014470187 0045-6535 nnns volume:119 year:2015 pages:1217-1223 http://dx.doi.org/10.1016/j.chemosphere.2014.09.099 Volltext http://www.ncbi.nlm.nih.gov/pubmed/25460764 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-GEO SSG-OLC-PHA SSG-OLC-DE-84 SSG-OPC-GGO GBV_ILN_21 GBV_ILN_70 GBV_ILN_4012 AR 10100 38.32 AVZ 35.00 AVZ AR 119 2015 1217-1223 |
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The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. 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Wu, Zhichao ddc 333.7 rvk AR 10100 bkl 38.32 bkl 35.00 misc Brassica napus - genetics misc Cadmium - metabolism misc Soil Pollutants - toxicity misc Cadmium - toxicity misc Soil Pollutants - metabolism misc Plant Roots - metabolism misc Biological Transport - genetics misc Plant Shoots - metabolism misc Brassica napus - growth & development misc Xylem - metabolism misc Brassica napus - metabolism misc Xylem - genetics Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) |
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333.7 DNB AR 10100 AVZ rvk 38.32 bkl 35.00 bkl Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) Brassica napus - genetics Cadmium - metabolism Soil Pollutants - toxicity Cadmium - toxicity Soil Pollutants - metabolism Plant Roots - metabolism Biological Transport - genetics Plant Shoots - metabolism Brassica napus - growth & development Xylem - metabolism Brassica napus - metabolism Xylem - genetics |
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xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (brassica napus) |
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Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) |
| abstract |
Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. |
| abstractGer |
Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. |
| abstract_unstemmed |
Cadmium (Cd) is a toxic metal which harms human health through food chains. The mechanisms underlying Cd accumulation in oilseed rape are still poorly understood. Here, we investigated the physiological and genetic processes involved in Cd uptake and transport of two oilseed rape cultivars (Brassica napus). L351 accumulates more Cd in shoots but less in roots than L338. A scanning ion-selective electrode technique (SIET) and uptake kinetics of Cd showed that roots were not responsible for the different Cd accumulation in shoots since L351 showed a lower Cd uptake ability. However, concentration-dependent and time-dependent dynamics of Cd transport by xylem showed L351 exhibited a superordinate capacity of Cd translocation to shoots. Additionally, the Cd concentrations of shoots and xylem sap showed a great correlation in both cultivars. Furthermore, gene expression levels related to Cd uptake by roots (IRT1) and Cd transport by xylem (HMA2 and HMA4) were consistent with the tendencies of Cd absorption and transport at the physiological level respectively. In other words, L351 had stronger gene expression for Cd transport but lower for Cd uptake. Overall, results revealed that the process of Cd translocation to shoots is a determinative factor for Cd accumulation in shoots, both at physiological and genetic levels. |
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| title_short |
Xylem transport and gene expression play decisive roles in cadmium accumulation in shoots of two oilseed rape cultivars (Brassica napus) |
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Zhao, Xiaohu Sun, Xuecheng Tan, Qiling Tang, Yafang Nie, Zhaojun Hu, Chengxiao |
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