文献类型： 外文期刊
作者： Chen, Anle 1 ; Liu, Tong 1 ; Deng, Yan 1 ; Xiao, Ran 1 ; Zhang, Tong 1 ; Wang, Yuan 2 ; Yang, Yuheng 1 ; Lakshmanan, Prakash 1 ; Shi, Xiaojun 1 ; Zhang, Fusuo 1 ; Chen, Xinping 1 ;
作者机构： 1.Southwest Univ, Coll Resources & Environm, Interdisciplinary Res Ctr Agr Green Dev Yangtze Ri, Chongqing 400715, Peoples R China
2.Southwest Univ, Key Lab Low carbon Green Agr Southwestern China, Minist Agr & Rural Affairs, Chongqing 400716, Peoples R China
3.Southwest Univ, Coll Plant Protect, Chongqing 400715, Peoples R China
4.Sugarcane Res Inst, Guangxi Acad Agr Sci, Nanning 530007, Peoples R China
5.Univ Queensland, Queensland Alliance Agr & Food Innovat, St Lucia, Qld 4067, Australia
6.China Agr Univ, Natl Acad Agr Green Dev, Coll Resources & Environm Sci, Key Lab Plant Soil Interact, Beijing 100193, Peoples R China
关键词： Nitrate; Cadmium; Suberin; Radial transport; Maize root
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）
ISSN： 0048-9697
年卷期： 2023 年 878 卷
页码：
收录情况： SCI
摘要： In this study, effect of nitrate-dependent suberization in maize root on cadmium (Cd) uptake and accumulation was investigated. Suberization in maize roots was significantly lower in plants grown with a high nitrate supply compared with low nitrate. This decrease was seen in the total amount of suberin, in which the aliphatic suberin amount was sig-nificantly decreased, whereas no difference in aromatic suberin content between different N-treatments. RNA-sequencing showed that suberin biosynthesis genes were upregulated in low nitrate treatment, which correlated well with the increased suberin content. Bioimaging and xylem sap analysis showed that reduced exodermal and en-dodermal suberization in roots of plants grown under high nitrate promoted radial Cd transport along the crown root. The enhanced suberization in crown roots of plants grown in low nitrate restricted the radial transport of Cd from epi-dermis to cortex via decreased accessibility to Cd related transporters at the plasmalemma. Also, under low nitrate sup-ply, the Cd transport gene ZmNramp5 was upregulated in the crown root, which may enhance Cd uptake by root tip where exodermis and endodermis were not fully suberized. These results suggest that high nitrate supply enhances Cd uptake and radial transport in maize roots by reducing exodermal and endodermal suberization.
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