两型亚洲小车蝗卵巢发育的分级及差异研究

摘要

Oedaleus decorus asiaticus is a serious insect pest in northern grassland regions of China,and it has a terrible effect on pasture,croplands and cities.Ovaries can be classified as 5 grades according to their morphological characteristics.,grade Ⅰ,transparent period;grade Ⅱ,yolk deposition period;grade lⅢ,egg-forming period;grade Ⅳ,egg-maturing period,and grade Ⅴ,oviposition period.For gregarious phases of O.decorus asiaticus,the ovaries developed at the start of 5.20 d after eclosion;oviposition time was 50.21 d after eclosion and developmental duration was 43.75 d.While for solitary phases,the ovaries developed at the start of 5.75 d after eclosion;oviposition time was 52.25 d after eclosion,and developmental duration was 46.50 d.The egg development of O.decorus asiaticus was faster in gregarious phases than in solitary phases (P＜0.01).The results showed that O.decorus asiaticus had two types of differentiation phenomena in terms of development and breeding (P＜ 0.01).The results of ovarian developmental time can also be used to predict egg-laying period of O.decorus asiaticus,which will orovide important information for O.decorus asiaticus prevention and control in fields.%亚洲小车蝗Oedaleus decorus asiaticus是我国北方草原区的重要害虫,其聚集、迁移暴发给草原、农田及城市带来了恶劣影响.本文根据亚洲小车蝗卵巢发育形态特征的变化,将其分为5个级别:Ⅰ级为透明期,Ⅱ级为卵黄沉淀期,Ⅲ级为卵粒形成期,Ⅳ级为成熟待产期,Ⅴ级为产卵期.群居型亚洲小车蝗的卵巢发育起始时间为羽化后5.20 d,产卵时间为羽化后50.21 d,发育历期为43.75 d;散居型亚洲小车蝗的卵巢发育起始时间为羽化后5.75 d,产卵时间为羽化后52.25 d,发育历期为46.50 d,群居型亚洲小车蝗的卵巢发育比散居型种群快,且两者差异均达到极显著水平(P＜0.01).研究结果从亚洲小车蝗发育繁殖角度验证了该蝗虫具有两型分化现象,且差异明显,同时对卵巢发育时间的研究可应用于亚洲小车蝗产卵期的预测预报,为田间蝗虫防治工作提供依据.