Changes in Physiological Indexes of Amygdalus persica in Fruit Development Stage

In order to discuss the growth rules of peach fruits,provide the theoretical basis for formulating cultural practice and ensuring the best harvest time.Taking A.persica as experimental materials,the dynamic changes of fruit size and contents of soluble sugar,titratable acid,SOD,Vc and MDA were analyzed.The results showed that the weight of single fruit and fruit length and breadth changed consistently.During fruit development stage,the growth curves of fruit length and breadth were double S shapes in A.persica.The fruits in 25 days to 55 days after blooming date increased slowly,however,55 days to fruit ripening increased quickly;The soluble sugar level increased with the growth of the fruit;The titratable acid level presented the trend of falling with the growth of the fruit;The contents of Vc presented uptrend at first,and then decreased along with peach fruit development;The MDA content increased with the fruit development,and increased quickly at the ripening stage;The SOD activity increased all the time.