Effects of low temperature stress during flowering period on pollen characters and flag leaf physiological and biochemical characteristics of rice

• Published in: Ying yong sheng tai xue bao Vol. 22; no. 1; p. 66
• Main Authors: Deng, Hua-Bing, Che, Fang-Lu, Xiao, Ying-Hui, Tang, Wen-Bang, Pan, Yi, Liu, Zhi-Xian, Chen, Li-Yun
• Format: Journal Article
• Language: Chinese
• Published: China 01.01.2011
• Subjects: Adaptation, Physiological; Cold Temperature; Flowers - physiology; Oryza - growth & development; Oryza - metabolism; Oryza - physiology; Plant Leaves - physiology; Pollen - metabolism; Stress, Physiological
• ISSN: 1001-9332

Taking cold-tolerant rice cultivar 996 and cold-sensitive rice cultivar 4628 as test materials, a growth chamber experiment was conducted to investigate their pollen characters and flag leaf physiological and biochemical characteristics under the effects of low temperature stress. The plants were respectively treated with low temperature [ 19 degrees C (06:00-8:00; 19:00-23:00 )/21 degrees C (08:00-10:00; 16:00-19:00)/23 degrees C (10:00-16:00)/17 degrees C (23:00-06:00)] and optimal temperature [24 degrees C (06:00-8:00; 19:00-23:00)/26 degrees C (08:00-10:00; 16:00-19:00)/30 degrees C (10:00-16:00)/22 degrees C (23:00-06:00)] for seven days after heading. Low temperature stress decreased the anther dehiscence coefficient and pollen germination rate, as well as the sterile pollen rate of spikelets on middle and lower parts of panicles, with the anther dehiscence coefficient and pollen germination rate of cultivar 996 being significantly higher than those of cultivar 4628, indicating that cold-tolerant cultiv