EARLY DEVELOPMENT OF PARTHENOGENETIC EGG IN 3 SPECIES OF APHIDS (HOMOPTERA APHIDIDAE)
EARLY DEVELOPMENT OF PARTHENOGENETIC EGG IN 3 SPECIES OF APHIDS (HOMOPTERA APHIDIDAE)
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DOI：
10.1016/s0020-7322(78)80013-0
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发表时间：
1978-01-01
期刊：
影响因子：
--
通讯作者：
BLACKMAN, RL
中科院分区：
文献类型：
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作者：
BLACKMAN, RL
三种植物单性生殖型生殖器结构与功能的光学显微镜研究。本文报道了蚜虫Acyrthosiphon pisum、Myzus persicae和Aphis fabae孤雌生殖卵发育的细胞遗传学研究。经过一系列的卵原细胞分裂后，生殖器细胞被阻滞在早期的前期阶段，此时同源染色体似乎显示出部分联会。最初的1或2个卵母细胞直接从这些生殖细胞中的最后一个发育而来，在整个生长期染色质逐渐浓缩。只有在1或2次排卵后，一组后部细胞才同时与其余细胞分化为推定的卵母细胞。这些细胞的染色体进入凝聚期，持续到每个染色体从生殖细胞释放出来。同源物的分离先于缩合，没有证据支持核内减数分裂重组的理论。从生殖腔到卵巢管中的第一和第二卵泡都有营养索，至少在囊胚发育阶段供应胚胎。
Light microscope studies of the structure and function of the germarium in parthenoqenetic morphs of 3 spp. of aphids, Acyrthosiphon pisum, Myzus persicae and Aphis fabae, are reported, with emphasis on cytogenetic aspects of the development of the parthenogenetic egg. After a series of oogonial divisions, cells of the germarium are arrested at an early prophase stage in which the homologous chromosomes appear to show a partial synapsis. The first 1 or 2 oocytes develop directly from the most posterior of these germarial cells with gradual condensation of chromatin throughout their growth phase. Only after 1 or 2 ovulations have occurred does a group of posterior cells become differentiated simultaneously from the rest as presumptive oocytes. The chromosomes of these cells enter a condensation phase which lasts until after each is released from the germarium. Separation of homologues precedes condensation and no evidence could be found to support the theory of endomeiotic recombination. Trophic cords running from the germarial lumen to the 1st and 2nd follicles in an ovariole, and supplying embryos at least up to the blastula stage of development, were found in all 3 spp.