Production and metabolism of indole acetic acid in roots and root nodules of Phaseolus mungo

Ghosh, Sudip Kumar; Basu, P. S.

doi:10.1016/j.micres.2006.01.001

Cited by 57 publications

(28 citation statements)

References 19 publications

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“…However, at later stages, roots with mature root nodules of Phaseolus mungo (L.) were found to contain high levels of indole acetic acid (IAA) compared to non-nodulated roots (Ghosh and Basu 2006). Also, IAA transport inhibitors, such as 1-naphthylphthalamic acid (NPA), triiodobenzoic acid (TIBA), have been reported to reduce the number of mature nodules, thereby demonstrating the importance of IAA in maturation of nodule structures (Takanashi et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Endophytic bacteria improve nodule function and plant nitrogen in soybean on co-inoculation with Bradyrhizobium japonicum MN110

et al. 2014

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The potential of bacterial endophytes to improve symbiotic efficiency through synergistic interactions with rhizobia can help to improve nodulation and nitrogen fixation in legume plants. In the present study, we compared the effect of endophytic plant growth-promoting bacteria on nodulation and effective rhizobial symbiosis in soybean. Nodule endophyte Bacillus megaterium LNL6 isolated from root nodules of Lesperdeza sp. and plant endophyte Methylobacterium oryzae CBMB20 isolated from rice leaves were selected as endophytic co-inoculants. Treatment of Bradyrhizobium japonicum MN110 along with B. megaterium LNL6 and M. oryzae CBMB20 exhibited an increase in nodule number in pots at 35 days after sowing compared to single inoculation of MN110. Additionally, both the co-inoculation treatments showed significant increase in nodule activity which was measured in terms of nodule leghemoglobin content, nodulated root ARA and total plant nitrogen content compared to solitary inoculation of B. japonicum MN110. Though ACCD activity of the co-inoculated strains can be attributed to increase in nodule number, the observed increase in root nitrogenase activity and leghemoglobin content in the nodules is understood as due to plant growth promotion traits of the specific endophytic strains. High levels of IAA produced by B. megaterium LNL6 can be considered to have aided development of mature nodules which thereby improved the nodular nitrogen fixation. Thus, endophytic lifestyle combined with plant growth-promoting traits, such as IAA production, ACC deaminase, cellulase and nitrogenase activity by B. megaterium LNL6 and M. oryzae CBMB20, contributes to the improvement of overall symbiotic nitrogen fixation by the plant.Keywords Co-inoculation Á Nodule efficiency Á Methylobacterium Á Bacillus Á Root nodule nitrogenase activity Abbreviations IAA Indole-3-acetic acid ACC 1-Aminocyclopropane-1-carboxylate DAS Days after sowing

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Section: Discussionmentioning

confidence: 99%

Endophytic bacteria improve nodule function and plant nitrogen in soybean on co-inoculation with Bradyrhizobium japonicum MN110

et al. 2014

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“…In general, root nodules contain more auxin than non-nodulated roots (Badenochjones et al 1983;Ghosh and Basu 2006). Nodules induced with low IAA-producing Rhizobium mutants contain less IAA than nodules initiated by the wild-type strain (Theunis 2005).…”

Section: Symbiosismentioning

confidence: 99%

Auxin and Plant-Microbe Interactions

Spaepen

Vanderleyden

2010

Cold Spring Harbor Perspectives in Biology

876

508

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“…This difference could be the result of direct effects resulting from trophic competitions and antagonistic/synergic interactions between inoculated strains as related earlier by Figueiredo and others (2008b). These initial results led to the choice of two strains: Sm78D (symbiotic strain) and 104 (PGPR more tolerant to salt stress than S90) for further work (inoculation under salt stress), In fact, the use of a PGPR that is highly tolerant to salt stress can increase the growth of legumes under salt stress conditions (Ghosh and Basu 2006;Shukla and others 2012) consequently the S90 strain, which was less tolerant to salt than the 104, strain was excluded. A beneficial effect of these two selected isolates (Sm78D and 104) on SDW and RDW was observed in both single inoculations than in co-inoculation at different ratios (Table 2).…”

Section: Effect Of Bacterial Inoculation On Plant Growthmentioning

confidence: 99%

An Approach of Improving Plant Salt Tolerance of Lucerne (Medicago sativa) Grown Under Salt Stress: Use of Bio-inoculants

Baha

Bekki

2014

J Plant Growth Regul

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This study was conducted to examine the effects of the combined application of rhizobial strains and plant growth-promoting rhizobacteria at different ratios on growth and salt tolerance of lucerne. Vegetative growth, relative water content, photosynthetic pigments and organic and inorganic solute contents in leaves were measured after 6 weeks of sowing. The results showed that bacterial inoculation significantly increased shoot and root dry weight, leaf number and relative water content whereas salinity reduced the growth of plants mainly in root dry weight and leaf area. However, the obtained results showed a significant improvement in the growth under salt stress of inoculated plants compared to non-inoculated ones. Regarding photosynthetic pigments, inoculation and salt induced significant variations in the total chlorophyll content, whereas changes in carotenoids remained insignificant. The inoculated plants accumulated less sodium and chloride and maintained a constant potassium content compared to non-inoculated plants. This would imply that the bacteria have retained Na ? and Cl -and so have consequently limited their translocation to the leaves and have promoted selectivity of K ? ions relative to Na ? . The levels of organic solutes and soluble proteins were not significantly affected in most plants by both salt and bacterial inoculation, suggesting that they are not directly involved in the strategy of salt tolerance of Lucerne. These results indicate that inoculation with these plant growth promoting rhizobacteria could mitigate the adverse effects of soil salinity on growth of lucerne suggesting that these species could be used as bio-inoculants to increase productivity in arid and semi-arid lands.

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Production and metabolism of indole acetic acid in roots and root nodules of Phaseolus mungo

Cited by 57 publications

References 19 publications

Endophytic bacteria improve nodule function and plant nitrogen in soybean on co-inoculation with Bradyrhizobium japonicum MN110

Endophytic bacteria improve nodule function and plant nitrogen in soybean on co-inoculation with Bradyrhizobium japonicum MN110

Auxin and Plant-Microbe Interactions

An Approach of Improving Plant Salt Tolerance of Lucerne (Medicago sativa) Grown Under Salt Stress: Use of Bio-inoculants

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