The role of root border cells in aluminum resistance of pea (Pisum sativum) grown in mist culture

被引：31

作者：

Yu, Min ^{[1
]}

Shen, Renfang ^{[2
]}

Liu, Jiayou ^{[1
]}

Chen, Rongfu ^{[2
]}

Xu, Miaomiao ^{[1
]}

Yang, Yong ^{[1
]}

Xiao, Hongdong ^{[1
]}

Wang, Huizhen ^{[1
]}

Wang, Huoyan ^{[1
]}

Wang, Changquan ^{[3
]}

机构：

[1] Foshan Univ, Dept Hort, Foshan 528000, Peoples R China

[2] Chinese Acad Sci, China Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

[3] Sichuan Agr Univ, Coll Resources & Environm, Yaan 625014, Peoples R China

来源：

JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE | 2009年 / 172卷 / 04期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

cell wall; mucilage; pectin root; growth; PECTIC POLYSACCHARIDE; RHAMNOGALACTURONAN-II; SUPPLEMENTAL BORON; CALLOSE FORMATION; DISTAL PART; TOXICITY; MAIZE; SENSITIVITY; CYTOSKELETON; MUCILAGE;

D O I：

10.1002/jpln.200800039

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Root border cells are considered to contribute to aluminum (Al) resistance by protecting the root apex from Al toxicity. In the present study, the responses of root apices of pea (Pisum sativum) to Al exposure in mist culture with border cells stripped off or not were compared. Inhibition of root elongation, induction of callose synthesis, and accumulation of Al were more pronounced in root apices stripped from border cells. Aluminum application led to higher Al concentrations in border cells than in root apices. The same trend was found for Al contents in cell walls of border cells compared to root apices. The analysis of cell-wall pectin indicated that the concentrations of total sugars, uronic acids, and 2-keto-3-deoxyoctonic acid (KDO) were higher in border cells than in root apices, especially when exposed to Al. Together, these results suggest that root border cells enhance the Al resistance of root apices by immobilizing Al in their cell-wall pectin, thus protecting the root apex.

引用

页码：528 / 534

页数：7

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