Physiological mechanism underlying the effect of high temperature during anthesis on spikelet-opening of photo-thermo-sensitive genic male sterile rice lines

Author:

Chen Jing,Xu Yangdong,Fei Keqi,Wang Rui,He Jiang,Fu Lidong,Shao Shimei,Li Ke,Zhu Kuanyu,Zhang Weiyang,Wang Zhiqin,Yang Jianchang

Abstract

AbstractDecrease in the grain yield resulted from a low percentage of opened spikelets under high temperature (HT) during anthesis is a serious problem in the seed production of photo-thermo-sensitive genic male sterile (PTGMS) rice (Oryza sativa L.) lines, and the mechanism is little understood. Elucidating the physiological mechanism underlying the effect of HT during anthesis on spikelet-opening of PTGMS lines would have great significance in exploring the effective way to mitigate the adverse effect of HT. In this study, two PTGMS lines and one restorer line of rice were used and were subjected to normal temperature (NT) and HT treatments. The results showed that, compared with NT, HT significantly decreased the percentage of opened spikelets, fertilization percentage and seed-setting by significantly increasing the percentage of wrapped spikelets and reducing the spikelet-opening angle, length of spikelet-opening time. The HT significantly decreased the contents of soluble sugars, jasmonic acid (JA) and methyl jasmonate (MeJA) in the lodicules before and at glume-opening, which were significantly correlated with and accounts for the low percentage of opened spikelets under HT for rice, especially for the PTGMS lines.

Funder

National Natural Science Foundation of China

the National Key Research and Development Program of China

Jiangsu Creation Program for Post-graduation Students

the Top Talent Supporting Program of Yangzhou University

Priority Academic Program Development of Jiangsu Higher Education Institutions

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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