MISC

2006年7月

Internal mechanisms of plant adaptation to aluminum toxicity and phosphorus starvation in three tropical forages

JOURNAL OF PLANT NUTRITION
  • Toshihiro Watanabe
  • ,
  • Mitsuru Osaki
  • ,
  • Hiromi Yano
  • ,
  • Idupulapati M. Rao

29
7
開始ページ
1243
終了ページ
1255
記述言語
英語
掲載種別
DOI
10.1080/01904160600767484
出版者・発行元
TAYLOR & FRANCIS INC

Many tropical forage grasses and legumes grow well in acid soils, adapting to excess aluminum (Al) and phosphorus (P) starvation stresses by using mechanisms that are still unclear. To determine these mechanisms, responses to Al toxicity and P starvation in three tropical forages were studied: two grasses, Brachiaria hybrid cv. 'Mulato' (B. ruziziensis clone 44-06 x B. brizantha cv. 'Marandu') and Andropogon gayanus, and one legume, Arachis pintoi. The tropical grasses tolerated high levels of At toxicity and P starvation, with the Brachiaria hybrid maintaining very low levels of Al concentration in shoots. Al-27 Nuclear Magnetic Resonance spectroscopy (NMR) analysis revealed that, in the Brachiaria hybrid, Al makes complexes with some ligands such as organic-acid anions in the root symplast. The forages probably adapted to P starvation through high P-use efficiency. These experiments provide the first direct evidence we know of that organic acid anions within root tissue help detoxify A] in non-accumulator species such as the Brachiaria hybrid.

Web of Science ® 被引用回数 : 19

リンク情報
DOI
https://doi.org/10.1080/01904160600767484
CiNii Articles
http://ci.nii.ac.jp/naid/80018995352
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000239386800007&DestApp=WOS_CPL