Screening of high temperature tolerant rice (Oryza Sativa L.) varieties from current commercial varieties and materials

doi:10.14088/j.cnki.issn0439-8114.2020.20.005

Abstract

Abstract: By simulating the daily temperature change pattern of typical local high temperature stress in a climate chamber,14 rice (Oryza sativa L.) varieties were treated with high temperature at flowering stage by cascade-temperature testing method.Assessing the fertility rate of varieties under different temperatures,the heat tolerance index (HTI) and integrated heat tolerance index (IHTI) of each variety were calculated,and the heat tolerance comprehensive index was used as the final index to determine the heat tolerance of rice varieties.The results showed that the comprehensive heat resistance index of Quanyouhuazhan and Quanliangyouhuazhan were greater than 2.5,and the heat resistance index was greater than 0.75 when the daily average temperature were 30.0 and 32.0℃,respectively.When the daily average temperature was 34.0,the heat resistance index decreased significantly.The comprehensive heat tolerance index of other varieties was lower than 2.5,and when the daily average temperature was 32.0,the heat resistance index was 0.51 or less.Two more tolerant varieties of Quanyouhuazhan and Quanliangyouhuazhan were selected,which can be used for extension in commercial production in greater area in the future safely.Suitable heat avoidance measures should be taken for those varieties with 2.0≤IHTI<2.5,and for varieties with IHTI<2.0,their commercial use should be limited to spread in areas where heat damage often occurs.

Key words: heat tolerance, rice (Oryza sativa L.), fertility rate, heat tolerance comprehensive index

CLC Number:

S511

WANG Chun-hu, MU Qi-lin, WANG Song, TIAN Xiao-hai. Screening of high temperature tolerant rice (Oryza Sativa L.) varieties from current commercial varieties and materials[J]. HUBEI AGRICULTURAL SCIENCES, 2020, 59(20): 25-28.

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