Grain-filling of superior spikelets and inferior spikelets for japonica rice under low-amplitude warming regime in lower reaches of Yangtze River Basin
| Autor: | Wenzhu Chen, Lin Chen, Ganghua Li, Haixiang Zhang, She Tang, Zhenghui Liu, Yanfeng Ding, Zhi Dou, Shaohua Wang, Chengqiang Ding |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
biology 04 agricultural and veterinary sciences Structural basin Grain filling biology.organism_classification 01 natural sciences Japonica Japonica rice Grain weight Horticulture 040103 agronomy & agriculture Genetics Yangtze river 0401 agriculture forestry and fisheries Environmental science Animal Science and Zoology Cultivar Sink (computing) Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | The Journal of Agricultural Science. 159:59-68 |
| ISSN: | 1469-5146 0021-8596 |
| DOI: | 10.1017/s0021859621000228 |
| Popis: | 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°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°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. |
| Databáze: | OpenAIRE |
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