Heat Stress Is More Damaging to Superior Spikelets than Inferiors of Rice (Oryza sativa L.) due to Their Different Organ Temperatures
文献类型: 外文期刊
作者: Guanfu Fu ; Baohua Feng +; Caixia Zhang ; Yongjie Yang ; Xueqin Yang ; Tingting Chen ; Xia Zhao ; Xiufu Zhang ; Qianyu Jin *; Longxing Tao *
作者机构:
关键词: heat injury;inferior spikelets;organ temperatures;rice (Oryza Sativa L.);superior spikelets
期刊名称: FRONTIERS IN PLANT SCIENCE
ISSN: 1664-462X
年卷期: 2016 年 7 卷
页码:
收录情况: JCR(2021版)
摘要: In general, the fertility and kernel weight of inferior spikelets of rice (Oryza Sativa L.) are obviously lower than those of superior spikelets, especially under abiotic stress. However, different responses to heat stress are seemed to show between the superior and inferior spikelet, and this response is scarcely documented that the intrinsic factors remain elusive. In order to reveal the mechanism underlying, two rice plants with different heat tolerance were subjected to heat stress of 40 degrees C at anthesis. The results indicated that a greater decrease in fertility and kernel weight was observed in superior spikelets compared to inferior spikelets. This decrease was primarily ascribed to their different organ temperatures, in which the temperature of the superior spikelets was significantly higher than that of inferior spikelets. We inferred the differences in canopy temperature, light intensity and panicle types, were the primary reasons for the temperature difference between superior and inferior spikelets. Under heat stress, the fertility and kernel weight of superior and inferior spikelets decreased as the panicle numbers per plant were reduced, which was accompanied by significantly increasing the canopy temperatures. Thus, it was suggested that the rice plant with characteristic features of an upright growth habit and loose panicles might be more susceptible to heat stress resulting from their higher canopy and spikelets temperatures.
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