Selenium Application Improves Drought Tolerance during Reproductive Phase of Rice

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 experime...

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Bibliographic Details
Published in:Sustainability 2023-02, Vol.15 (3), p.2730
Main Authors: Patnaik, Girija Prasad, Monisha, V, Thavaprakaash, N, Djanaguiraman, M, Sachin, S, Vikram, Kannamreddy, Girwani, Thaimadam, Jeeva, M, Monicaa, M, Patnaik, Likhit, Behera, Biswaranjan, Mrunalini, Kancheti, Srinivasan, G, Naik, Mude Ashok, Varshini, S. V, Sapthagiri, S
Format: Article
Language:English
Subjects:
Agricultural production
Agricultural research
Climate change
Crop yield
Crop yields
Crops
Cultivation
Drought
Drought resistance
Droughts
Experiments
Field tests
Flowering
Foliage
Grain cultivation
Irrigation
Moisture content
Physiological aspects
Plant growth
Plot (Narrative)
Potassium
Productivity
Rain
Rice
Selenium
Stress
Sustainability
Temperature effects
Water content
Water sprays
Wheat
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Summary: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.
ISSN:2071-1050
2071-1050
DOI:10.3390/su15032730