High temperature negatively impacts rice production, and the heat-tolerant cultivars could improve the resistance to high
temperature stress. In the present study, six rice varieties were exposed to high temperatures stress (35°C and 38°C) for 3 days
during the early filling stage. The differences among two high-temperature treatments were analyzed in terms of yield
components, grain quality and physiological parameters of rice. The results showed that high temperature decreased seed
setting rate, 1000-grain weight, plumpness, single plant yield, brown rice rate, milled rice rate and amylose content while
increased unfilled grain rate of all rice varieties compared with the control. However, the yield components of different rice
varieties in response to high temperature exhibited significant genotypic differences. In addition, the influence of high
temperature on the hybrid rice variety Jinyou402 was greater than that on Ganxin203, and the influence of high temperature
on the conventional rice variety E134 was greater than that on Zhong531. The 38°C treatment was more damaging to early
rice than the 35°C treatment. Meanwhile, the influences of high temperature on the physiological parameters of flag leaves
were consistent with the influence on yield components and grain quality.
Jun Yang, Xiaorong Chen, Changlan Zhu, Xiaosong Peng, Xiaopeng He, Junru Fu, Jianmin Bian, Lifang Hu, Linjuan Ouyang, Haohua He. (2018) EFFECTS OF HIGH TEMPERATURE ON YIELD, QUALITY AND PHYSIOLOGICAL COMPONENTS OF EARLY RICE, , Volume 55, Issue 1.
