Involvement of multiple aluminium exclusion mechanisms in aluminium tolerance in wheat

被引：57

作者：

Pellet, DM

Papernik, LA

Jones, DL

Darrah, PR

Grunes, DL

Kochian, LV

机构：

[1] CORNELL UNIV,USDA ARS,US PLANT SOIL & NUTR LAB,ITHACA,NY 14853

[2] UNIV OXFORD,DEPT PLANT SCI,OXFORD OX1 2JD,ENGLAND

来源：

PLANT AND SOIL | 1997年 / 192卷 / 01期

关键词：

aluminium tolerance; malate; phosphate; rhizosphere pH; root (apex exudate); Triticum;

D O I：

10.1023/A:1004256121772

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

The goal of this study was to determine if AI-chelators other than malate are released from root apices and are involved in Al-tolerance in different wheat (Triticum aestivum L.) genotypes. Also we wanted to establish if root exudates contribute to increases in rhizosphere pH around the root tip. In seedlings of Al-tolerant Atlas, we have documented a constitutive phosphate exudation from the root apex. Because phosphate can complex Al and bind protons, it could play an important role in Al tolerance, both via complexation of Al3+ and by contributing to the alkalinization of rhizosphere pH observed at the apex of Atlas. This study suggests that in wheat, Al-tolerance can be mediated by multiple exclusion mechanisms controlled by different genes.

引用

页码：63 / 68

页数：6