Selenium Application Improves Drought Tolerance during Reproductive Phase of Rice

Girija Prasad Patnaik, V. Monisha, N. Thavaprakaash (), M. Djanaguiraman (), S. Sachin, Kannamreddy Vikram, Thaimadam Girwani, M. Jeeva, M. Monicaa, Likhit Patnaik, Biswaranjan Behera, Kancheti Mrunalini, G. Srinivasan, Mude Ashok Naik, S. V. Varshini and S. Sapthagiri
Additional contact information
Girija Prasad Patnaik: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
V. Monisha: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
N. Thavaprakaash: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
M. Djanaguiraman: Department of Crop Physiology, Tamil Nadu Agricultural University, Coimbatore 641003, India
S. Sachin: Agroclimate Research Centre, Tamil Nadu Agricultural University, Coimbatore 641003, India
Kannamreddy Vikram: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
Thaimadam Girwani: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
M. Jeeva: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
M. Monicaa: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
Likhit Patnaik: Department of Agricultural Biotechnology, Odisha University of Agriculture and Technology, Bhubaneswar 751003, India
Biswaranjan Behera: ICAR—Indian Institute of Water Management, Bhubaneswar 751023, India
Kancheti Mrunalini: ICAR—Indian Institute of Pulse Research, Kanpur 208024, India
G. Srinivasan: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
Mude Ashok Naik: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
S. V. Varshini: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India
S. Sapthagiri: Department of Agronomy, Tamil Nadu Agricultural University, Coimbatore 641003, India

Sustainability, 2023, vol. 15, issue 3, 1-13

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.

Keywords: rice; drought; critical stage; selenium; foliar spray (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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