Ecdysteroid titres and location in developing eggs of Schistocerca gregaria |
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| Institution: | 1. College of Life Sciences, Qingdao Agricultural University, Qingdao 266109, China;2. CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;3. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;4. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;5. CAS Engineering Laboratory for Marine Ranching, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;6. Zhongke Tonhe (Shandong) Marine Technology Co., Ltd, Dongying 257200, China;1. Conservation Ecology Lab, Department of Botany, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, India;2. Centre for Biodiversity Studies, Baba Ghulam Shah Badshah University, Rajouri, Jammu and Kashmir, India;3. Piramal Foundation for Education Leadership (State Transformation Program), Jammu and Kashmir, India;4. Department of Forestry, North Eastern Hill University (NEHU) Tura Campus, Tura, Meghalaya, India;1. Department of Chemistry, COMSATS University Islamabad, Abbottabad Campus, Abbottabad 22060, Pakistan;2. Department of Chemistry, The Islamia University of Bahawalpur, Bahawalpur 63100, Pakistan;3. Department of Chemistry, Government College University, Faisalabad 38000, Pakistan;4. Natural and Medical Sciences Research Center, University of Nizwa, Nizwa 611, Sultanate of Oman;5. Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China |
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| Abstract: | Ecdysteroid levels in the separated embryo and yolk fractions of Schistocerca gregaria eggs have been determined at each of the developmental stages. The major hormones present both in the free and conjugated state are ecdysone, 20-hydroxyecdysone and 2-deoxyecdysone. At the beginning of embryonic development the ecdysteroids occur only in the yolk whereas, after blastokinesis, they are found in the embryo. The levels of conjugates fall during embryonic development, whereas a decrease of free hormone titres in early embryogenesis is followed by a marked increase in late embryos (stage 26 and 28). The possible role of ecdysteroids in relation to the morphogenetic processes of egg development and the site of origin of the free ecdysteroid peaks are discussed. |
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