Research on Influence Factors in Heat Injury of Loquat Peel

Effecting factors for heat injury in loquat peel were studied at the National Field Genebank of Loquat in Fuzhou.The results showed that the ability of resistance to heat injury was quite different among the germplasms.The tree performance and the of fruiting resulted differently in the heat injury of loquat peel.The turning-color period was the sensitive stage of fruit peel to heat injury.During this stage,the temperature in fruit surface was 1.2-6.1℃ higher than air temperature on sunny day 9:00-17:00,and the time of it reaching to peak value was earlier in fruit surface than in air temperature.Under the natural lighting,the threshold temperature of 'Hongboluo' heat injury was 39℃ for 90 min,'Duo 2' was 39℃ for 60 min and 'Hongzhong' was 40℃ for 90 min.The results provided the information for preventing heat injury of loquat peel.