ULTRASTRUCTURE AND RESISTANCE TO WATER-LOSS IN EGGS OF ACANTHOSCELIDES-OBTECTUS SAY (COLEOPTERA, BRUCHIDAE)
ULTRASTRUCTURE AND RESISTANCE TO WATER-LOSS IN EGGS OF ACANTHOSCELIDES-OBTECTUS SAY (COLEOPTERA, BRUCHIDAE)
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DOI：
10.1016/0022-1910(81)90003-2
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发表时间：
1981-01-01
影响因子：
2.2
通讯作者：
HAMON, C
中科院分区：
文献类型：
--
作者：
BIEMONT, JC;CHAUVIN, G;HAMON, C
A. obtectus说是由3个信封：外层，绒毛膜和卵黄膜。外层由侧输卵管壁分泌。绒毛膜和卵黄膜由滤泡细胞分泌。在受精和产卵后的一小时内，卵黄膜变得非常致密。绒毛膜由3层组成，其中一层具有次结晶的超微结构。成熟的、未受精的、含绒毛膜的卵母细胞，其卵黄膜疏松，产下后或从侧输卵管取出后，在干燥的环境中迅速崩解。受精卵对干燥有很强的抵抗力：在25 ℃下12天后。C和5%相对湿度条件下，获得存活的幼虫。紧密的卵黄膜是防止脱水的最有效保护。绒毛膜和外层在防止鸡蛋水分流失方面的效果要差得多。保留卵子的是侧输卵管，似乎不会导致其包膜结构的任何改变。
The mature oocyte of A. obtectus say is surrounded by 3 envelopes: an external layer, a chorion and a vitelline membrane. The external layer is secreted by the walls of the lateral oviducts. The chorion and vitelline membrane are secreted by the follicular cells. The vitelline membrane becomes very compact during the hour following fertilization and laying. The chorion is composed of 3 layers, one of which has a paracrystalline ultrastructure. Mature, unfertilized, chorion-containing oocytes, whose vitelline membranes are loose, dehydrate rapidly in a dry atmosphere after laying or after removal from the lateral oviducts. Fertilized eggs are quite resistant to desiccation: after 12 days at 25.degree. C and 5% relative humidity, viable larvae are obtained. The compact vitelline membrane is the most effective protection against dehydration. The chorion and the external layer are much less effective in preventing water loss from the egg. The retention of eggs is the lateral oviducts does not seem to lead to any modification of the structure of their envelopes.