Characterization of Embryonic Stages through Variations in the Egg＇s Contents in Spodoptera fitura
Characterization of Embryonic Stages through Variations in the Egg＇s Contents in Spodoptera fitura作者机构：Department of Zoology Hazara University Garden Campus Mansehra 21300 Pakistan Department of Zoology University of Karachi Karachi 75270 Pakistan
出 版 物：《Journal of Agricultural Science and Technology》 (农业科学与技术（美国大卫英文）)
年 卷 期：2010年第4卷第5期
页 面：24-36页
学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 09[农学] 0904[农学-植物保护] 090402[农学-农业昆虫与害虫防治]
主 题：Ecdysteroid embryogenesis nucleic acids organogenesis protein.
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.
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