Abstract
Growth‐promoting diazotrophs can enhance the growth and development of associated crops by transferring fixed N or by improving nutrient uptake through modulation of hormone‐linked phenomena in inoculated plants. Six rhizobial diazotrophs isolated from a wide range of legume hosts were investigated to determine their growth‐promoting activities in lowland rice ( Oryza sativa L.) during 1997. Seeds and seedlings of rice Pankaj were inoculated with different rhizobia and grown in potted soil supplemented with varied amounts of mineral N. Inoculation with Rhizobium leguminosarum bv. trifolii E11, Rhizobium sp. IRBG74, and Bradyrhizobium sp. IRBG271 increased rice grain and straw yields by 8 to 22 and 4 to 19%, respectively, at different N rates. Nitrogen, P, and K uptake were increased by 10 to 28% due to rhizobial inoculation. Nitrogen‐15‐based studies indicated that the increased N uptake was not due to biological N 2 fixation (BNF). Inoculation also increased Fe uptake in rice by 15 to 64%. Indole‐3‐acetic acid (IAA) accumulated in the external root environment of rice plants when grown gnotobiotically with rhizobia. The results indicate that certain strains of rhizobia can promote rice growth and yield, most likely through mechanisms that involve changes in growth physiology or root morphology rather than BNF.
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Claims 6
Claim · model-written summary
Rhizobial inoculation increased rice grain yield by 8 to 22%.
- Taxon
- rice
Oryza sativae0 - Treatment
- Inoculation with Rhizobium leguminosarum bv. trifolii E11, Rhizobium sp. IRBG74, and Bradyrhizobium sp. IRBG271e0
- Outcome
- graine0
- Direction
- increasede0
- Value
- 8 to 22e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with Rhizobium leguminosarum bv. trifolii E11, Rhizobium sp. IRBG74, and Bradyrhizobium sp. IRBG271 increased rice grain and straw yields by 8 to 22 and 4 to 19%, respectively, at different N rates”
Claim · model-written summary
Rhizobial inoculation increased rice straw yield by 4 to 19%.
- Taxon
- riceOryza sativae0
- Treatment
- Inoculation with Rhizobium leguminosarum bv. trifolii E11, Rhizobium sp. IRBG74, and Bradyrhizobium sp. IRBG271e0
- Outcome
- straw yieldse0
- Direction
- increasede0
- Value
- 4 to 19%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation with Rhizobium leguminosarum bv. trifolii E11, Rhizobium sp. IRBG74, and Bradyrhizobium sp. IRBG271 increased rice grain and straw yields by 8 to 22 and 4 to 19%, respectively, at different N rates”
Claim · model-written summary
Rhizobial inoculation increased rice N, P and K uptake by 10 to 28%.
- Taxon
- riceOryza sativat0
- Treatment
- rhizobial inoculatione0
- Outcome
- Nitrogen, P, and K uptakee0
- Direction
- increasede0
- Value
- 10 to 28%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen, P, and K uptake were increased by 10 to 28% due to rhizobial inoculation”
t0“Rice”
Claim · model-written summary
The increased nitrogen uptake was not attributable to biological nitrogen fixation.
- Taxon
- riceOryza sativat0
- Outcome
- increased N uptakee0
- Qualifier
- not due to biological N 2 fixation (BNF)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increased N uptake was not due to biological N 2 fixation (BNF)”
t0“Rice”
Claim · model-written summary
Rhizobial inoculation increased rice iron uptake by 15 to 64%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation also increased Fe uptake in rice by 15 to 64%”
Claim · model-written summary
IAA accumulated around roots of rice grown with rhizobia.
- Taxon
- riceOryza sativae0
- Organ / stage
- roote0
- Outcome
- Indole‐3‐acetic acid (IAA) accumulatede0
- Qualifier
- when grown gnotobiotically with rhizobiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Indole‐3‐acetic acid (IAA) accumulated in the external root environment of rice plants when grown gnotobiotically with rhizobia”
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