Low temperature, especially occured at booting stage, would cause sterility of rice florets and became one of restricting factors of rice yield. In order to evaluate the effect of low temperature on yield of rice, and ascertain the low temperature warning indicator at booting stage in South China, a controlled experiment was conducted with two cultivars, Tianyou 998 and Guinongzhan at four daily minimum temperature levels (18, 16, 14, and 12℃, diurnal temperature range is 4℃,nutural air temperature as CK) with three durations (1, 3, and 5 d). The results showed that under the low temperature treatment during the booting stage of earlyseason rice, SOD and POD enzyme activities of the second leaf from top decreased, MDA content increased,SPAD value and photosynthetic rate declined, the percentage of pollen fertility and spikeletfertilized rate decreased. The number of grains per panicle, seedsetting rate, and 1000grain weight decreased, leading to a reduction in grain yield. When Tmin≤16℃ (3 d),the grain yield of Tianyou 998 and Guinongzhan significantly decreased, as well as development progress of grains and photosynthesis of the second leaf from top(P<0.05). The lower temperature and longer duration have a greater influence on the damage to rice. The coldtolerance of hybrid rice Tianyou 998 was weaker than the conventional rice Guinongzhan. The critical temperature for chilling damage was the daily lowest temperature 16℃ (3 days).
LI Jianling1,3, HUO Zhiguo2, WU Liji1, ZHU Qinghua1, HU Fei1，*
. Effects of Low Temperature on Grain Yield of Rice and Its Physiological Mechanism at the Booting Stage[J]. Chinese Journal OF Rice Science, 2014
, 28(3)
: 277
-288
.
DOI: 10.3969/j.issn.1001-7216.2014.03.007
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