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Morphological structures and developmental characteristics of the ovaries of Bactrocera dorsalis

CHEN Min;CHEN Peng;YE Hui;JI Qing-E;LI Jian-Ping;YUAN Rui-Ling;YANG Shan;Laboratory of Biological Invasion and Ecosecurity Yunnan University;School of Life Sciences Southwest Forestry University;Yunnan Academy of Forestry;School of Plant Protection Fujian Agriculture and Forestry University;School of Forestry Southwest Forestry University;  
The ovary is a vital reproductive organ of Bactrocera dorsalis. The ovary morphology and its development determine the reproductive behavior and also fertility of the fly. In this study,the ovarian morphological and developmental characteristics were described each day after the fly eclosion,and ovarian developmental stages were classified also. The results showed that B. dorsalis female adult has two polytrophic ovaries,each of them including 28 parallel ovarioles. No ovarioles were found in the ovaries of newly emerged B. dorsalis. The first ovarioles was detected at the 4thday after eclosion. Along with the first ovariole development,the number of ovarioles increased gradually. The full mature ovary was recorded at the 10thday after the fly emergence. Into last stage of the fruit fly oviposition,its ovarioles disappeared gradually,and ovaries became smaller and atrophied. Ovarian developmental progresses of B. dorsalis in this study were divided into five stages,previtellogenic stage( Ⅰ), vitellogenic deposition stage( Ⅱ),expectant stage of mature eggs( Ⅲ),peak stage of oviposition( Ⅳ),last stage of oviposition( Ⅴ). This study provides indispensable ovarian information for B. dorsalis reproductive biology and reproductive behavior researches.
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