Characterization of Embryonic Stages through Variations in the Egg＇s Contents in Spodoptera fitura  

作　　者：F. Perveen H. Ahmed F. M. Abbasi N. Y. Siddiqui A. Gul 

机构地区：[1]Department of Zoology, Hazara University, Garden Campus, Mansehra 21300, Pakistan [2]Department of Zoology, University of Karachi, Karachi 75270, Pakistan

出　　处：《Journal of Agricultural Science and Technology》2010年第5期24-36,共13页农业科学与技术（美国大卫英文）

摘　　要：This paper describes the embryonic development of the common cutworm Spodoptera litura （Fabricius） （Lepidoptera： Noctuidae） which is divided into eight embryonic stages, through variations in the egg＇s contents. Experiments were conducted on the eggs ofS. litura under laboratory conditions. The highest concentration of the protein （min.-max.： 32-! 40 lag/egg） and the lowest of the carbohydrate （min.-max.： 3.0-44.0 lag/egg） were obtained; similarly, the DNA content was smaller （min.-max.： 1.0-38.2 lag/egg） than the RNA （min.-max.： 9.2-360.0 lag/egg） throughout the embryogenesis. Three peaks of ecdysteroid titre were observed which were responsible for appearance of particular events during embryogenesis. The last highest peak of 400_＋33.4 lag/egg was appeared at 84 h after oviposition when larva was ready to hatch. Therefore, it is concluded that eight embryonic stages in S. litura were characterized by fluctuation in the egg＇s contents, which were responsible for gradual-progressive embryonic development. The egg-larval development did not show a normal distribution of embryonic developmental-time.

关 键 词：ECDYSTEROID EMBRYOGENESIS nucleic acids ORGANOGENESIS protein. 

分 类 号：S433.4[农业科学—农业昆虫与害虫防治] S831.5[农业科学—植物保护]