Abstract
Rice (Oryza sativa L.) grain yield is reduced by drought stress during reproductive stages. In this work, the effects of foliar selenium (Se) spray on the reduction of drought stress are measured and the most critical stage of rice is identified. Three field experiments were carried out. In experiments I and II, the sensitive stage was determined by imposing drought stress at the panicle initiation and flowering stages by withholding irrigation for 10, 15, 20, and 25 days. In experiment III, drought stress was induced by depriving plants of moisture for 20 or 25 days. Se spray was then applied at rates of 0, 10, and 20 mg L−1 to alleviate the drought, and its effects were evaluated. Overall, it was reported that the panicle initiation stage was more vulnerable to drought stress than the flowering stage, as evidenced by a larger reduction in grain yield. Employing Se as a foliar spray at a rate of 20 mg L−1 under drought stress enhanced the number of filled grains m−2, the total number of grains m−2, and grain yield ha−1 by 22.0, 4.3, and 11.0%, respectively, over water spray. This shows a positive interaction or synergistic interaction between drought tolerance and selenium application. These results demonstrate that foliage supplementation of Se at a dosage of 20 mg L−1 alleviate the adverse effects of drought stress at the panicle initiation stage in rice cultivation. Se mitigated the negative effects of drought by improving the membrane stability index, relative water content, and proline content.
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Claims 5
Claim · model-written summary
Drought at the panicle initiation stage reduced grain yield more than drought at the flowering stage.
- Taxon
- Oryza sativa
Oryza sativae0 - Organ / stage
- panicle initiation stagee1
- Treatment
- drought stresse1
- Outcome
- grain yielde1
- Direction
- larger reductione1
- Comparator
- flowering stagee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) grain yield is reduced by drought stress during reproductive stages”
e1“the panicle initiation stage was more vulnerable to drought stress than the flowering stage, as evidenced by a larger reduction in grain yield”
Claim · model-written summary
Foliar Se at 20 mg L−1 under drought increased the number of filled grains per m2 over water spray.
- Taxon
- Oryza sativaOryza sativae0
- Treatment
- Se as a foliar spraye2
- Outcome
- number of filled grainse2
- Direction
- enhancede2
- Value
- 22.0e2
- Qualifier
- under drought stresse2
- Comparator
- water spraye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) grain yield is reduced by drought stress during reproductive stages”
e2“Employing Se as a foliar spray at a rate of 20 mg L−1 under drought stress enhanced the number of filled grains m−2, the total number of grains m−2, and grain yield ha−1 by 22.0, 4.3, and 11.0%, respectively, over water spray”
Claim · model-written summary
Foliar Se at 20 mg L−1 under drought increased the total number of grains per m2 over water spray.
- Taxon
- Oryza sativaOryza sativae0
- Treatment
- Se as a foliar spraye2
- Outcome
- total number of grainse2
- Direction
- enhancede2
- Value
- 4.3e2
- Qualifier
- under drought stresse2
- Comparator
- water spraye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) grain yield is reduced by drought stress during reproductive stages”
e2“Employing Se as a foliar spray at a rate of 20 mg L−1 under drought stress enhanced the number of filled grains m−2, the total number of grains m−2, and grain yield ha−1 by 22.0, 4.3, and 11.0%, respectively, over water spray”
Claim · model-written summary
Foliar Se at 20 mg L−1 under drought increased grain yield over water spray.
- Taxon
- Oryza sativaOryza sativae0
- Treatment
- Se as a foliar spraye2
- Outcome
- grain yielde2
- Direction
- enhancede2
- Value
- 11.0%e2
- Qualifier
- under drought stresse2
- Comparator
- water spraye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) grain yield is reduced by drought stress during reproductive stages”
e2“Employing Se as a foliar spray at a rate of 20 mg L−1 under drought stress enhanced the number of filled grains m−2, the total number of grains m−2, and grain yield ha−1 by 22.0, 4.3, and 11.0%, respectively, over water spray”
Claim · model-written summary
Se alleviated the negative effects of drought on the membrane stability index, relative water content and proline content.
- Taxon
- Oryza sativaOryza sativae0
- Treatment
- See3
- Outcome
- membrane stability index, relative water content, and proline contente3
- Direction
- improvinge3
- Qualifier
- negative effects of droughte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice (Oryza sativa L.) grain yield is reduced by drought stress during reproductive stages”
e3“Se mitigated the negative effects of drought by improving the membrane stability index, relative water content, and proline content”
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