Spermatogenesis in the rice- infesting brown planthopper, Nilaparvata lugens (STAL) (Homoptera : Delphacidae).

Date

3-1988

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Cell division stages were observed to described in details the cellular and chromosomal features of spermatogenesis in N. lugens. Spermatogonia were small, oval-shaped and divided by mitosis. The first meiotic division was reductional for spermtocyte I followed by equational at spermatocyte II. Chromosome count was 2n= 30 (1411A = XY) yielding two types of spematozoa. Pachytene autosomes had relative mean lengths ranging from 0.031 mm to 0.124 mm The next chromosome measured 0.028 mm The meiotic index was 0.67. At the end of meiosis I, two daughter cells were formed which later divided by meiosis II into four haploid neclei which were transformed into spermatids. A complicated process of growth and changes converted the epermatids into epermatozoa. The spermhead measured 8u long. Homologous chromosomes possessed diffuse centromeres. Chromosome abberations. Included aneuploidy and agmatoploidy.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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