Chinese Journal OF Rice Science >
Effects of Drought Priming During Tillering Stage on Panicle Development and Yield Formation Under High Temperature During Panicle Initiation Stage in Rice
Received date: 2023-11-15
Revised date: 2024-01-22
Online published: 2024-05-13
【Objective】 The aim of this study was to investigate the impact of drought priming during the tillering stage on rice panicle development and yield formation under high temperatures during the panicle initiation stage, along with the underlying physiological mechanisms.【Method】 Two rice varieties, Liangyoupeijiu (heat-sensitive) and Shanyou 63 (heat-tolerant), were chosen for the study. A pot experiment was conducted with two water treatments (flooding irrigation and drought priming during tillering stage) and two temperature treatments (normal temperature and high temperature during panicle initiation stage). The effects of drought priming on spikelet differentiation and degradation, pollen viability, spikelet fertility, spikelet size, grain yield, and underlying physiological characteristics were evaluated.【Result】 Under normal temperature treatment, there was no significant difference in grain yield between flooding irrigation and drought priming for both varieties. However, under high temperature treatment, drought priming led to a significant increase in seed setting rate and 1000-grain weight, resulting in a 54.0% increase in grain yield for Liangyoupeijiu and a 20.1% increase for Shanyou 63 compared to flooding irrigation. Drought priming also resulted in the significant increases in the activities of peroxidase and superoxide dismutase and significant decrease in malondialdehyde content of spikelet, and significant increase in the pollen viability by 26.0%, and in spikelet fertility by 39.0% in Liangyoupeijiu under high temperature treatment. Under flooding irrigation, high temperature treatment resulted in significant reductions in spikelet size and differentiated spikelet number for both varieties compared to normal temperature treatment. However, under high temperature treatment, drought priming led to significant increases in the contents of panicle non-structural carbohydrates and spikelet cytokinins (trans-zeatin and trans-zeatin-riboside), as well as increases in spikelet length, width, and differentiated spikelet number across both varieties.【Conclusion】 Drought priming during the tillering stage effectively mitigated the negative effects of high temperature stress on spikelet development and fertility by enhancing antioxidant enzyme activities, cytokinin content in spikelets, and non-structural carbohydrate levels in panicles. This resulted in improved rice yield formation under high temperature stress conditions, offering insights for rice production in regions prone to high temperature stress.
ZHAO Yiting, XIE Keran, GAO Ti, CUI Kehui . Effects of Drought Priming During Tillering Stage on Panicle Development and Yield Formation Under High Temperature During Panicle Initiation Stage in Rice[J]. Chinese Journal OF Rice Science, 2024 , 38(3) : 277 -289 . DOI: 10.16819/j.1001-7216.2024.231110
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