Cytological studies on macropterous and brachypterous brown planthoppers, Nilaparvata lugens (Stal) (Homoptera : Delphacidae).

Date

6-1983

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

The cytology of the two wing forms of BPH, brachypterous and macropterous, was determined. Qualitative and quantitative analyses of the first meiotic division of primary spermatocytes in both forms revealed that their chromosomes were holokinetic or possessed diffused kinetochores. The male chromosome number was 2n=30, consisting of 14 II + XY. The first division process was reductional and resulted to secondary spermatocytes which divided equationally. Wing morphism in BPH was highly determined by insect host interactions. Such interactions manifested significant variations in the testicular cells of both wing forms of BPH. For instance, the relative autosomal and sex chromosomal lengths during pachytene vary significantly in both forms. Based on behavior and morphometries of chromosomes, it could be deduced that the genes controlling wing morphism were sex—linked but possible autosomal interactions cannot be ignored. Brachyptery possibly resulted from a duplication of a chromosomal segment in the sex chromosome.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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