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24-Epicastasterone and KH2PO4 protect grain production of wheat crops from terminal heat impacts by modulating leaf physiology.
- Source :
- Archives of Agronomy & Soil Science; Sep2023, Vol. 69 Issue 11, p2006-2019, 14p
- Publication Year :
- 2023
-
Abstract
- Heat stress during the grain filling is one of most critical factors impacting grain yield in winter wheat. In a two-year field experiment, we studied the effects of 24-Epicastasterone and KH<subscript>2</subscript>PO<subscript>4</subscript> on heat-stressed wheat applied during different times. A completely randomized block design was used with three reagents, that is, 24-Epicastasterone, KH<subscript>2</subscript>PO<subscript>4</subscript> and H<subscript>2</subscript>O and three spraying times, that is, pre-heat, under-heat and post-heat. Two cultivars, that is, Huaimai 33 and Annong 0711 were subjected to a 7 d post-flowering heat stress using plastic tents. Our study suggests that greater grain weight in heat-stressed plants was achieved through sustaining leaf greenness and higher assimilates supplies to grains. When heat-stressed plants sprayed either with 24-Epicastasterone or KH<subscript>2</subscript>PO<subscript>4</subscript> could sustain a relatively higher leaf photosynthetic capacity by up-regulating antioxidant enzymes with reduced damage on lipid membranes and leaf chlorophyll. We also found that KH<subscript>2</subscript>PO<subscript>4</subscript> was relatively more effective in improving leaf physiology and grain yield of heat-stressed plants than 24-Epicastasterone. Further analysis showed that pre-heat or post-heat was more pronounced in protecting plants from heat injury than spraying the plants under heat stress. Thus, spraying KH<subscript>2</subscript>PO<subscript>4</subscript> either prior to or post stress incidence is recommended to protect wheat crops from terminal heat stress. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03650340
- Volume :
- 69
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Archives of Agronomy & Soil Science
- Publication Type :
- Academic Journal
- Accession number :
- 163446205
- Full Text :
- https://doi.org/10.1080/03650340.2022.2130265