Studies on the Technical System of Heat Resistance Identification of Rice
The high and stable yield of rice is severely restricted by high temperature stress during heading and flowering.The most direct and effective way to solve the heat damage of rice is to select and breed excellent heat-resistant varieties.Batch and effective identification and evaluation of heat resistance of rice varieties is an important step in the breeding of heat resistant varieties,but the setting of defining temperature is not the same in the current technical system of heat tolerance identification of rice.Combined with the historical meteorological data,the field high temperature was simulated,and the high temperature seed setting rate(HTX)was used as the index to determine the temperature for defining the difference of heat tolerance of rice varieties in the heat resistance identification system.Eight groups of tests were set up based on the standardized temperature interval,and the first batch of materials were treated respectively.When the maximum temperature of the treatment group was 39.0 ℃,the difference in high temperature seed setting rate of various varieties was the most obvious.Three groups of different temperatures were set in the greenhouse,and the second batch of materials were treated respectively.In the second group of treatment(39.0 ℃),the difference of high temperature seed setting rate of various varieties was the most obvious.In conclusion,the maximum temperature for determining the heat tolerance of rice varieties was 39.0 ℃.
riceheading and flowering stageheat tolerancehigh temperature seed setting ratedefined temperature
NETL
NSTL
万方数据
