菜心高温半致死温度与耐热适应性

The LT_(50) and Heat Tolerance Adaptability of Flowering Chinese Cabbage in High Temperature

以6份菜心为材料,研究半致死温度(LT50)和田间高温下播种成活率与菜心耐热性的关系。利用SAS和EXE分析两者的相关性。结果表明,在不同的高温中,菜心的LT50呈"S"型上升,LT50值在46～49℃之间。6个菜心材料耐热性从强到弱的顺序依次为:四九-19号菜心>四九黄菜心>油绿50天菜心>501菜心>油绿菜心701>特青迟心4号,该结果与田间高温下菜心播种成活率成显著正相关,可以作为菜心耐热性评价的指标。

Heat tolerance of 6 flowering Chinese cabbage cultivars were measured by semilethal temperature（LT50） and the survival rate of seeded during high stress in field,and the correlation between those databases according to SAS and EXE software.The results showed that all cultivars increased following an S-curve in different high stress temperature.The LT50 was between 46℃and 49℃.The heat tolerance of 6 cultivars decreased in the order of sijiu-19caixin,sijiu huang caixin,youlv 50 tian caixin,youlv 501 caixin,youlv 701 caixin,teqing chixin 4.The result was Significant positive correlation with the survival rate of seeded during high stress in field ahd it could be used as flowering Chinese cabbage heat resistance evaluation index.