期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 67, 期 3, 页码 979-989出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erv514
关键词
Aluminium; cell wall; nitric oxide; pectin; pectin methylation; pectin methylesterase
资金
- National Basic Research Programme (973 Programme) of China [2013CB127403]
- National Natural Science Foundation of China [31272237, 30771292]
- Foundation for University PhD Granting Discipline of the Ministry of Education [20120101110130]
- IPNI
Nitric oxide (NO) is an important bioactive molecule involved in cell wall metabolism, which has been recognized as a major target of aluminium (Al) toxicity. We have investigated the effects of Al-induced NO production on cell wall composition and the subsequent Al-binding capacity in roots of an Al-sensitive cultivar of wheat (Triticum aestivum L. cv. Yang-5). We found that Al exposure induced NO accumulation in the root tips. Eliminating NO production with an NO scavenger (cPTIO) significantly alleviated the Al-induced inhibition of root growth and thus reduced Al accumulation. Elimination of NO, however, did not significantly affect malate efflux or rhizosphere pH changes under Al exposure. Levels of cell wall polysaccharides (pectin, hemicelluloses 1, and hemicelluloses 2) and pectin methylesterase activity, as well as pectin demethylation in the root apex, significantly increased under Al treatment. Exogenous cPTIO application significantly decreased pectin methylesterase activity and increased the degree of methylation of pectin in the root cell wall, thus decreasing the Al-binding capacity of pectin. These results suggest that the Al-induced enhanced production of NO decreases cell wall pectin methylation, thus increasing the Al-binding capacity of pectin and negatively regulating Al tolerance in wheat.
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