ORIGIN AND FATE OF GERM-CELLS IN MALE AND FEMALE EMBRYOS OF HAPLOTHRIPS-VERBASCI (OSBORN) (INSECTA, THYSANOPTERA, PHLAEOTHRIPIDAE)
ORIGIN AND FATE OF GERM-CELLS IN MALE AND FEMALE EMBRYOS OF HAPLOTHRIPS-VERBASCI (OSBORN) (INSECTA, THYSANOPTERA, PHLAEOTHRIPIDAE)
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DOI：
10.1002/jmor.1051600305
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发表时间：
1979-01-01
影响因子：
1.5
通讯作者：
HEMING, BS
中科院分区：
文献类型：
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作者：
HEMING, BS
对雄性蓟马和雌性蓟马 (H. verbasci) 的雄性和雌性胚胎中的生殖细胞进行了比较。在第 6 次卵裂分裂后，平均有 11 个卵裂能量进入卵的后极质，当它们在细胞质中吸收极性颗粒时，显然成为极细胞。这些细胞在回返之前和回返过程中异步增殖，雄性胚胎中平均产生 36 个生殖细胞，雌性胚胎中平均产生 31 个生殖细胞。生殖细胞的明显性别分化在生殖带伸长期间开始，并在附属物出现后不久完成。雌性生殖细胞比雄性大，可能含有 2 个核仁。生殖细胞在旋转之前分成两组，中胚层细胞在旋转完成后不久聚集在这些细胞周围，形成性腺的初级上皮鞘和性导管的原基。雄性胚胎中每个性腺平均含有 13 个生殖细胞，雌性胚胎中平均含有 7 个生殖细胞，这个数量一直持续到孵化后有丝分裂恢复为止。在 ketatrepsis 过程中，雄性胚胎中平均有 11 个生殖细胞和雌性胚胎中平均有 2.6 个生殖细胞未能被封闭在性腺内，而是分散在卵黄中，并可能转化为卵黄噬菌体。 H. verbasci 胚胎中的生殖细胞发育与裸翅目胚胎中发生的类似事件相似，为缨翅目和裸翅目之间密切的系统发育关系提供了额外的证据。
Germ cells in male and female embryos of the arrhenotokous thrips, H. verbasci were compared. A mean of 11 cleavage energids enter the posterior pole plasma of the egg after the 6th cleavage division and apparently become pole cells when they take up polar granules in their cytoplasm. The cells proliferate asynchronously prior to and during anatrepsis to yield a mean of 36 germ cells in male embryos and 31 in females. Visible sex differentiation of germ cells begins during germ band elongation and is completed shortly after the appearance of appendages. Female germ cells are larger than those of the males and may contain 2 nucleoli. The germ cells separate into 2 groups just before katatrepsis and mesodermal cells collect about these to form the primary epithelial sheaths of the gonads and the primordia of the gonoducts shortly after revolution is completed. Each gonad contains a mean of 13 germ cells in male embryos and 7 in females, a number that persists until mitosis resumes after hatching. During ketatrepsis, a mean of 11 germ cells in male embryos and 2.6 in females fail to be enclosed within the gonads, become dispersed in the yolk and perhaps transform into vitellophages. Germ cell development in H. verbasci embryos resembles similar events taking place in psocid embryos, providing additional evidence for a close phylogenetic relationship between Thysanoptera and Psocoptera.