Identification of Heat Tolerance of Rice Test Varieties in the Middle and Lower Reaches of the Yangtze River
Received date: 2022-07-22
Online published: 2022-11-17
High temperature has become one of the main limiting factors affecting the growth and development of rice. In this study, totally 1379 rice varieties in recent three years were identified for heat tolerance at the flowering stage under natural field and greenhouse conditions, and the thermotolerance phenotype among varieties from different years, different types and sources was comprehensively analyzed. Among tested materials, 11.96%, 66.78%, 18.06%, 2.76% and 0.44% of them had the best （Grade 1）, good （Grade 3）, medium （Grade 5）, poor （Grade 7） and the worst （Grade 9） heat tolerance at the flowering stage, respectively; and the number of heat-tolerant varieties is increasing year by year. The overall situation of heat tolerance of different type cultivars was as follows: two-line hybrids > three line hybrids > conventional rice, in two-line hybrid rice, three-line hybrid rice and conventional rice, the proportion of varieties with heat tolerance above grade 3 at the flowering stage were 82.57%, 73.45% and 60.00%, respectively. The rice materials from national or provincial regional trial, green channel regional trial and alliance regional trial had similar heat-resistant performance. A set of identification method and assessment system have been established for rice heat tolerance at the flowering stage by adopting both natural high-temperature and artificial greenhouse conditions, which can make a relatively consistent and objective evaluation for heat tolerance of tested materials from different years, different environments and different degrees of heat stress.
XIAO Benze, NAN Bo, ZHANG Fangyu . Identification of Heat Tolerance of Rice Test Varieties in the Middle and Lower Reaches of the Yangtze River[J]. China Rice, 2022 , 28(6) : 21 -26 . DOI: 10.3969/j.issn.1006-8082.2022.06.005
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