Developmental dynamics of the ovary of Arma chinensis and its relationship with photoperiod
The Arma chinensis is an important commercial natural enemy.Understanding the developmental dynamics of ovaries and their regulating mechanisms is helpful to the accurate prediction of the egg-laying period and fecundity of female adults,and may offer an insights into predicting and regulating the occurrence of A.chinensis.This study investigated the ovary development process of A.chinensis and the effect of photoperiod on ovarian development.The results revealed that the female adult reproductive system of A.chinensis was mainly composed of the ovary,lateral oviduct,median oviduct,spermatheca and terminal filament.According to the morphological characteristics of ovaries,yolk deposition status and egg maturity,progress of ovarian development was categorized into five levels:transparent period(level Ⅰ),vitellogenesis period(level Ⅱ),egg maturation period(level Ⅲ),egg-laying period(level Ⅳ),and late egg-laying period(level Ⅴ).Further studies demonstrated that photoperiod significantly influenced the oogenesis of female adults.Ovaries of female adults developed optimally under long photoperiods(L//D=18 h//6 h and 16 h//8 h),with maximum ovary length and width,ovarian indexes,eggs number compared to other photoperiods.Conversely,under photoperiods of L//D=14 h//10 h,12 h//12 h,10 h//14 h,8 h//16 h and 6 h//18 h,ovarian development was delayed,with most ovaries remaining in the transparent period(level Ⅰ).This study contributes to our understanding of the reproductive biology of A.chinensis and provides a theoretical basis for its mass production and successful application in the future.
Arma chinensisovarian developmentovarian gradingphotoperiod
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NSTL
万方数据
