桃蛀螟卵巢发育过程及其与温度的关系

Ovarian development of Conogethes punctiferalis(Guenée)and its relationship with temperature

本文明确了桃蛀螟的雌性生殖系统由1对卵巢、1对侧输卵管、1根中输卵管、1个交配囊和1个受精囊组成。依据雌性生殖系统发育的典型特征,即卵巢小管形态、卵粒的成熟度、脂肪体的多少及形态,将卵巢发育过程分为乳白透明期(Ⅰ级)、卵黄沉积期(Ⅱ级)、成熟待产期(Ⅲ级)、产卵盛期(Ⅳ级)及产卵末期(Ⅴ级)5个发育时期。在温度为20、25℃和30℃下,桃蛀螟初羽化成虫完成卵巢发育的全部过程(Ⅰ级~Ⅴ级)所需时间分别为11.43、9.38、8.62 d。经推算,桃蛀螟卵巢各级(Ⅰ级~Ⅴ级)的发育起点温度分别为22.88、21.1、16.55、18.44、11.19℃,有效积温分别为0.37、4.45、23.22、35.10日·度和125.91日·度。根据不同温度下卵巢发育的速度,建立了卵巢发育速率的预测模型,这为桃蛀螟的短期精准预报提供了科学依据。

This article clarified the female reproductive system of Conogethes punctiferalis,which was composed of a pair of ovaries,a pair of lateral oviducts,one middle oviduct,one copulatory pouch and one bursa copulatrix.According to the typical characteristics of the developing female reproductive system,including the fine morphology of the ovarian tubules,the maturity of eggs,the number and morphology of the fat body,the ovarian developmental process was divided into five developmental stages:the transparent stage(levelⅠ),the vitellogenesis stage(levelⅡ),the egg maturation stage(levelⅢ),the egg-laying stage(levelⅣ)and the late egg-laying stage(levelⅤ).At the temperatures of 20,25℃and 30℃,the developmental durations of levelⅠto levelⅤwere 11.43,9.38,8.62 d,respectively.After calculation,the developmental temperature thresholds and sum of degree-day accumulation required for levelⅠ-levelⅤof ovarian development were 22.88,21.11,16.55,18.44,11.19℃,and 0.37,4.45,23.22,35.10,125.91 degree-days,respectively.According to the speed of ovarian development at different temperatures,an ovarian development prediction model was established,which provides a scientific basis for the accurate short-term forecast of C.punctiferalis.