期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 40, 期 11, 页码 2713-2721出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2008.06.016
关键词
Azospirillum brasilense; Rhizobium tropici; Rhizobium etli; Coinoculation; Flavonoids; Nod factors; nod-gene expression; Abiotic stress
类别
资金
- Spanish Ministry of Education and Science [AGL2006-13758-C05-01, AGL2006-13758-C05-04]
The effects of salt upon Azospirillum brasilense strain Cd on plant growth, nodulation, flavonoid and lipochitooligosaccharide (LCOs-Nod factor) production, were sequentially followed after 4, 7 and 14 days during a Rhizobium-Phaseolus vulgaris cv. Negro Jamapa interaction, in a hydroponics growth system. Azospirillum brasilense promoted root branching in bean seedling roots and increased secretion of nod-gene-inducing flavonoid species, as detected by high-performance liquid chromatography (HPLC). The results also support that A. brasilense allows a longer, more persistent exudation of flavonoids by bean roots. A general positive effect of Azospirillum-Rhizobium coinoculation on the expression of nod-genes by Rhizobium tropici CIAT899 and Rhizobium etli ISP42, and on nodulation factor patterns, was observed in the presence of root exudates. The negative effects obtained under salt stress on nod-gene expression and on Nod factors' appearance were relieved in coinoculated plants. (c) 2008 Elsevier Ltd. All rights reserved.
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