Journal
JOURNAL OF AGRICULTURAL SCIENCE
Volume 159, Issue 1-2, Pages 59-68Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0021859621000228
Keywords
Elevated temperature; grain weight; rice; sink strength; yield
Categories
Funding
- National Key R&D Program of China [2017YFD0300100, 2017YFD0300107, 2017YFD0300103]
- National Natural Science Foundation of China [32071949, 31701366, 31901446]
- Jiangsu Collaborative Innovation Center for Modern Crop Production (JCIC-MCP)
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Research on rice grain-filling under different temperature conditions indicated that warming less than 4 degrees Celsius did not greatly affect rice yield, but led to different responses for superior and inferior spikelets during the grain-filling process.
Grain-filling, as the final growth stage of rice, is sensitive to environmental temperature change. Previous studies mainly concerned about the effects of high temperature stress during grain-filling on rice growth, and most experiments were carried out with pot for cultivating rice and greenhouse for warming. This research investigated the response of rice grain-filling of superior spikelets (SS) and inferior spikelets (IS) of two japonica cultivars to elevated temperature during grain-filling stage under open-field warming conditions in lower reaches of Yangtze River Basin using free-air temperature enhancement facility. Results indicated that rice yield was not significantly changed by warming less than 4 degrees C. SS and IS showed different responses to elevated temperature during the grain-filling stage, whereas there were similar trends between two cultivars and years. For SS, although elevated temperature enhanced its filling rate during the early grain-filling period, and caused a shorter grain-filling period and a lighter grain weight; for IS, elevated temperature improved its grain weight by enhancing its filling rate during middle and late grain-filling period due to the increased number of days with suitable temperature. For both SS and IS, key starch biosynthesis enzymes and indole-3-acetic acid content exhibited generally a similar dynamics trend with grain-filling rates, and these sink strength parameters presented higher levels under elevated temperature relative to natural temperature for IS during middle and late grain-filling period. Consequently, warming less than 4 degrees C presented different influences on SS and IS; the improvement of IS filling under warming regime was associated with the intensification of grain sink strength.
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