Seed-Set of Large-Panicle Rice Cultivars Suffered from High Temperature at Anthesis

doi:10.3969/j.issn.1000-6362.2018.02.002

Abstract

Abstract: Enhancing sink capacity of large panicle is an important way to improve yield potential of super rice. However, environmental factors often impact fertilization and grain filling of large-panicle rice greater than those of the normal panicles. In this experiment, seed-set of large-panicle rice cultivars suffered from high temperature (daily mean temperature 30℃ and 33℃) within a phytotron at anthesis were investigated using two large-panicle rice cultivars (BL006 and R-nongbai) and one normal panicle rice cultivar (Huanghuazhan) as well. The natural light phytotron was applied in this experiment to simulate the typical disastrous high temperature weather of Hubei province in the field. Under high temperature treatments, spikelet fertilities of all the tested cultivars were decreased, and spikelet fertilities of BL006, R-nongbai and Huanghuazhan were decreased by 10.37，10.05 and 7.24 percentage points under high temperature 30℃, and by 53.17，65.38 and 8.17 percentage points under high temperature 33℃, respectively. High temperatures at 30℃ and 33℃ made a greater adverse impact on the inferior spikelets and superior spikelets, respectively, and the decrease of spikelet fertility under high temperature was associated with photosynthesis. Under high temperature 30℃, grain weights of BL006 and R-nongbai were decreased by 1.69% compared with normal temperature, whereas those of Huanghuazhan were increased by 2.45%. Under high temperature 33℃, grain weights of BL006 and Huanghuazhan were decreased by 18.38% and 11.65%, respectively, whereas those of R-nongbai were increased by 3.10%. In addition to high temperature, positions of the spikelet on a panicle also played an important part in determining grain weights. Accordingly, breeding large-panicle rice cultivars with tolerance to high temperature needs to improve heat resistance of spikelets on a panicle and photosynthetic capacity of rice cultivar.

Key words: Large-panicle rice, Anthesis, Spikelet fertility, 1000-grain weight, Photosynthetic capacity

CHEN Jian-zhen, YAN Hao-liang, LIU Ke, MU Qi-lin, ZHU Kai-dian, ZHANG Yun-bo, TIAN Xiao-hai. Seed-Set of Large-Panicle Rice Cultivars Suffered from High Temperature at Anthesis[J]. Chinese Journal of Agrometeorology, 2018, 39(02): 84-91.

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