Meiotic chromosomes of male green leafhoppers (GLH)
1985
Saxena, R.C. | Barrion, A.A. (International Centre of Insect Physiology and Ecology, Nairobi (Kenya))
Chromosome examinations showed that green leafhopper (GLH) spermatogonia divided mitotically and spermatocytal processes followed the conventional reductional-equational meiotic divisions. The primary spermatocytes at diakinesis had 7 bivalent autosomes and a univalent x-chromosome making the genomic complement 2n=15. At pachytene, relative mean chromosome length was 0.0 74-0.189. The sex chromosome measured 0.083 and the autosome with the nucleolar organizing region (NOR) had a relative mean length of 0.153. These chromosomes condensed maximally during premetaphase into dumbbells of bivalents measuring as follows: 4, 3, 3, 2.5, 2.5, 2.5, 1.9 and 1. The sex chromosome measured 1 micron while the chromosome with NOR measured 3 micron. The insemination potential of male GLH as determined by the mean meiotic index was approximated to be 0.84. Spontaneous chromosomal aberrations in individual GLH included 0.77% hypoploidy or reduction in chromosome number and 0.47% agmatoploidy or increase in number
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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