期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 63, 期 11, 页码 4095-4106出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ers090
关键词
Allantoate; allantoin; allantoinase; development; gene expression; nitrogen fixation; ureides
资金
- Ministerio de Educacion y Ciencia, Spain [AGL2009-11290, AGR01283]
- Consejeria de Innovacion, Ciencia y Empresa (Junta de Andalucia, Spain) [P07-RNM-03307]
- Plan Andaluz de Investigacion [BIO-115]
- Consejeria de Innovacion, Ciencia y Empresa (Junta de Andalucia, Spain)
The ureides allantoin and allantoate are key molecules in the transport and storage of nitrogen in ureide legumes. In shoots and leaves from Phaseolus vulgaris plants using symbiotically fixed nitrogen as the sole nitrogen source, ureide levels were roughly equivalent to those of nitrate-supported plants during the whole vegetative stage, but they exhibited a sudden increase at the onset of flowering. This rise in the level of ureides, mainly in the form of allantoate, was accompanied by increases in allantoinase gene expression and enzyme activity, consistent with developmental regulation of ureide levels mainly through the tissue-specific induction of allantoate synthesis catalysed by allantoinase. Moreover, surprisingly high levels of ureides were also found in non-nodulated plants fertilized with nitrate, at both early and late developmental stages. The results suggest that remobilized N from lower leaves is probably involved in the sharp rise in ureides in shoots and leaves during early pod filling in N-2-fixing plants and in the significant amounts of ureides observed in non-nodulated plants.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据