Cytology of whitebacked planthopper Sogatella furcifera (Horvath) (Homoptera : Delphacidae).

Date

3-1984

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

The cytology of newly emerged males of Sogatella furcifera or the whitebacked planthopper was determined by squash technique using lacto-aceto-orcein. The cellular, nuclear, chromosome behavior, shapes and morphometrics during the different stages of meiosis were observed. The diploid chromosome number was found to be 2n=29 consisting of 14 bivalent autosomes and one univalent sex chromosome. The sex determining mechanism is of the XX-XO type, the males being heterogametic and the females being homogametic. The first meiotic division was reductional and the males produced two types of spermatocytes, one with 14 chromosomes and the other with 14 chromosomes plus the X chromosome. Agmatoploid and aneuploid strains, containing more or less than the normal number of chromosomes, were found. The mechanisms involved maybe either the formation of binucleated cells as observed or due to the holokinetic or diffuse centric type of its chromosomes.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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