Aluminum tolerance in Centipedegrass (Eremochloa ophiuroides [Munro] Hack.): Excluding Al from root
文献类型： 外文期刊
作者： Yan, Jun 1 ; Chen, Jingbo 1 ; Yu, Li 2 ; Liu, Jianxiu 1 ;
作者机构： 1.Chinese Acad Sci, Inst Bot, Nanjing, Jiangsu, Peoples R China
2.Shanghai Acad Agr Sci, Inst Hort Res, Key Lab Protected Hort Technol, Shanghai 201403, Peoples R China
关键词： Centipedegrass;Aluminum tolerance;Organic acid anions;Hematoxylin staining;X-ray microanalysis;Citrate secretion;Mechanisms
期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）
ISSN： 0304-4238
年卷期： 2012 年 143 卷
页码：
收录情况： SCI
摘要： Centipedegrass (Eremochloa ophiuroides [Munro] Hack.) is a C4 perennial grass and well adapted to acid soils. Centipedegrass accession E041 (Lingchuan, Guangxi Province, China) was found to be more tolerant to Aluminum (Al) than E006 (Nanjing, Jiangsu Province, China). The objective of this study was to identify possible mechanisms associated with centipedegrass. After exposure to Al, citrate was detected in both E041 and E006 roots secretion. Phosphorous (P) starvation and La3+ (Lanthanum) treatment did not induce organic acid secretion. Secretion of organic acid of both E041 and E006 need an initial lag phase of 6 h, and increased significantly after 6h exposure to Al, which suggested that centipedegrass showed a pattern II-type organic acid secretion. Secretion of citrate increased with increasing external Al concentration, but the amount of citrate secreted was higher in E041 than in E006 which also accumulated more Al than E041. Al accumulated in the epidermal and sub epidermal cortical of root apices. The results suggested that secretion of citrate may be one of Al exclusion mechanisms in centipedegrass, and other mechanism may help to prevent Al from entering into central cylinder. (C) 2012 Elsevier B.V. All rights reserved.
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