Study on Dynamic Characteristics of the Growth and Development of Armeniaca dasycarpa （Ehrh.） Borkh

[Objective]This study aimed to analyze the dynamics of growth and development of Armeniaca dasycarpa( Ehrh.) Borkh fruit,thus providing the theoretical basis for cultivation and breeding of good-quality and high-yield A. dasycarpa. [Method] With A. dasycarpa cultivar Yechengzixing as the experimental material,P. cerasifera Ehrh cultivar Huangguoyingtaoli and A. vulgaris Lam. cultivars Luopuhongdaike,Wanshujianali and Kuchetuoyong as control,the vertical diameter,horizontal diameter and fresh weight of fruit and embryos were measured every 7 d during the growth and development period. [Result] The result showed that the whole fruit growth period of Yechengzixing,lasted 93 d from the end of flowering to fruit maturity. The dynamics of fruit vertical diameter,horizontal diameter and fresh weight of Yechengzixing presented"rapid-slow-rapid"double S-shaped curves. The whole fruit growth period of Yechengzixing could be divided approximately into three stages: first rapid growth stage,slow growth stage and second rapid growth stage,which lasted 29,42 and 21 d,respectively. Daily increment of fruit vertical diameter and horizontal diameter of Yechengzixing reached the maximum at the first rapid growth stage,while daily increment of fruit fresh weight reached the maximum at the second rapid growth stage. The dynamics of vertical diameter,horizontal diameter and fresh weight of Yechengzixing embryos presented S-shaped curves. Fruit growth and development dynamics of the tested materials presented double S-shaped curves. The whole fruit growth period of Yechengzixing,Huangguoyingtaoli and three apricot cultivars lasted 93,119 and 77- 98 d,respectively. Thus,the duration of fruit growth period of Yechengzixing was 26 d shorter than that of Huangguoyingtaoli and exhibited no significant difference compared with three apricot cultivars. The duration of each growth stage and daily increment of Yechengzixing fruit had no significant difference compared with three apricot cultivars. Moreover,Huangguoyingtaoli had a longer slow g