Facultative heterochromatin in Locusta migratoria spermatogenesis: correlation between electron opacity and heteropycnosis.
نویسندگان
چکیده
The unpaired X chromosome of Locusta migratoria males is facultatively heterochromatic in the spermatocytes and early spermatids, showing an alternating cycle of positive-negative-positive heteropycnosis. Discrimination between facultative heterochromatin and euchromatin was made using a modification of the Feulgen reaction. It was found that the differential stainability of the DNA of the X chromosome is correlated with the electron opacity of its chromatin. The corresponding differential stainability and electron opacity should reflect differences in protein content or in spatial rearrangement since the amount of DNA in the X chromosome that is transmitted by the spermatozoa to the next generation should remain constant.
منابع مشابه
An electron - microscope study of the cytoplasmic inclusions in the neurones of Locusta migratoria
The cytoplasmic inclusions of the neurones of adult Locusta migratoria have been examined in the electron microscope. The mitochondria are easily recognized by their cristae and outer double membranes. Electron-dense inclusions, also with an outer double membrane but possessing numerous closely spaced internal lamellae in various orientations, are probably small lipochondria. Larger and more di...
متن کاملبررسی بیولوژی ملخ Locusta migratoria L. (Acrididae) و اثر زنبور پارازیتوئید Scelio flavibarbis M. (Scelionidae) بر جمعیت آن در مزارع نیشکر خوزستان
متن کامل
عکس العمل سیستم ایمنی سلولی (Locusta migratoria ( Orth.: Acrididae در مقابل جدایه ی فشند Beauveria bassiana (Moniliales, Moniliaceae)
متن کامل
The synaptic process in Locusta migratoria spermatocytes by synaptonemal complex analysis.
We describe the synaptic process during meiotic prophase in spermatocytes from Locusta migratoria, using synaptonemal complex (SC) spreads analyzed by light (LM) and electron (EM) microscopy. At leptotene, a stage of short duration, unpaired axial elements begin to be assembled. Synapsis starts at zygotene, beginning usually at the terminal regions of the bivalents, either at the proximal, cent...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Journal of cell science
دوره 81 شماره
صفحات -
تاریخ انتشار 1986