TY - JOUR
T1 - Effect of Azospirillum brasilense coinoculated with Rhizobium on Phaseolus vulgaris flavonoids and Nod factor production under salt stress
AU - Dardanelli, Marta S.
AU - Fernández de Córdoba, Francisco J.
AU - Espuny, M. Rosario
AU - Rodríguez Carvajal, Miguel A.
AU - Soria Díaz, María E.
AU - Gil Serrano, Antonio M.
AU - Okon, Yaacov
AU - Megías, Manuel
PY - 2008/11
Y1 - 2008/11
N2 - 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.
AB - 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.
KW - Abiotic stress
KW - Azospirillum brasilense
KW - Coinoculation
KW - Flavonoids
KW - Nod factors
KW - nod-gene expression
KW - Rhizobium etli
KW - Rhizobium tropici
UR - http://www.scopus.com/inward/record.url?scp=53449091860&partnerID=8YFLogxK
U2 - 10.1016/j.soilbio.2008.06.016
DO - 10.1016/j.soilbio.2008.06.016
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AN - SCOPUS:53449091860
SN - 0038-0717
VL - 40
SP - 2713
EP - 2721
JO - Soil Biology and Biochemistry
JF - Soil Biology and Biochemistry
IS - 11
ER -