Effects of High Temperature on Grain Filling of Single-season Rice and Ratoon Rice in Hunan Province and Its Countermeasures
To clarify the effects of the rare continuous high temperature weather in 2022 on the grain filling of single-season rice and ratoon rice in Hunan Province,the seed setting rate and grain plumpness of inbred rice and hybrid rice were investigated in the planting area of single-season rice of Hunan Province.The results showed that high temperature significantly decreased the seed setting rate of single-season rice,and the effect on inbred rice was greater than that on hybrid rice.At the same time,the effect of high temperature on the seed setting rate of single-season rice was significantly different among regions with a greater effect in the northern region of Hunan Province.The seed setting rate of inbred rice and hybrid rice in the region north of 28° N was 6.7 and 3.1 percentage points lower than that in the region south of 28° N,respectively.Furthermore,the effects of high temperature on grain filling and yield of ratoon rice in the main season and ratooning season were significantly different.For those varieties with the harvest time of main season before July 15 and the full heading stage of ratooning season between September 1 to 17,the effect of high temperature on the seed setting rate and grain yield of main and ratooning seasons could be alleviated to a certain extent.In view of the effects of high temperature on the grain filling of single-season rice and ratoon rice,and the current situation of ratoon rice production in Hunan Province,some strategies were put forward to cope with the effects of high temperature stress on the grain filling of single-season rice under global warming environment,such as breeding of high temperature tolerant rice varieties,selecting and planting hybrid rice varieties in the area north of 28° N in Hunan Province under the condition of equal economic benefits,and readjusting the planting mode from single-season rice to ratoon rice and matching the appropriate sowing date.
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