Comparative cytology of rice (Oryza sativa L.)-infesting and weed-grass (Leersia hexandra swartz)-infesting macropterous brown planthoppers, Nilaparvata lugens (Stal) (Homoptera: Delphacidae).

Date

5-1985

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

ABSTRACT FAM1SAN, MARILOU L. University of the Philippines at Los Banos. May, 1985. Comparative Cytology of Nice (Oryza sativa L.)- Infesting and Weed-grass (Leersia hexandra Swartz)-Infesting Macropterous brown Planthoppers, Nilaparvata lugens (Stay) (Homoptera: Delphacidae). Adviser: Dr. Agelina A. barrion Oryza-infesting and Leersia-infesting macropterous male N. lugens were cytologically investigated using the testicular squash-technique with lacto-aceto-orcein. The Oryza population was observed to be cytologically akin to the Leersia population in as much as exhibiting a similar diploid autosomal count of 2n=28 (14II) and an identical sex-constitution of the XY type, the total karyotype formula being 2n=30 (1411 + XY). However, the morphometrical data for both populations show slight quantitative differences in the length and width of interphase nuclei and the main difference was observed in the relative lengths of their pachytene chromosomes. Comparatively, a high number of dividing cells was observed for the Oryza population although subjection of the meiotic index to statistical analysis revealed insignificant variation between the two populations. Different stages of meiosis I were followed revealing the chromosome behavior, condensation and movement to be

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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