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- W2116715417 abstract "ABSTRACT Nitrogen (N) and phosphorus (P) are the most limiting factors for plant growth. Some microorganisms improve the uptake and availability of N and P, minimizing chemical fertilizer dependence. It has been published that the RD64 strain, a Sinorhizobium meliloti 1021 strain engineered to overproduce indole-3-acetic acid (IAA), showed improved nitrogen fixation ability compared to the wild-type 1021 strain. Here, we present data showing that RD64 is also highly effective in mobilizing P from insoluble sources, such as phosphate rock (PR). Under P-limiting conditions, the higher level of P-mobilizing activity of RD64 than of the 1021 wild-type strain is connected with the upregulation of genes coding for the high-affinity P transport system, the induction of acid phosphatase activity, and the increased secretion into the growth medium of malic, succinic, and fumaric acids. Medicago truncatula plants nodulated by RD64 ( Mt -RD64), when grown under P-deficient conditions, released larger amounts of another P-solubilizing organic acid, 2-hydroxyglutaric acid, than plants nodulated by the wild-type strain ( Mt -1021). It has already been shown that Mt -RD64 plants exhibited higher levels of dry-weight production than Mt -1021 plants. Here, we also report that P-starved Mt -RD64 plants show significant increases in both shoot and root fresh weights when compared to P-starved Mt -1021 plants. We discuss how, in a Rhizobium -legume model system, a balanced interplay of different factors linked to bacterial IAA overproduction rather than IAA production per se stimulates plant growth under stressful environmental conditions and, in particular, under P starvation." @default.
- W2116715417 created "2016-06-24" @default.
- W2116715417 creator A5023529510 @default.
- W2116715417 creator A5052030028 @default.
- W2116715417 date "2010-07-15" @default.
- W2116715417 modified "2023-10-17" @default.
- W2116715417 title "Improvement of Phosphate Solubilization and <i>Medicago</i> Plant Yield by an Indole-3-Acetic Acid-Overproducing Strain of <i>Sinorhizobium meliloti</i>" @default.
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- W2116715417 doi "https://doi.org/10.1128/aem.02756-09" @default.
- W2116715417 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2901742" @default.
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