Cytology of the rice leaffolder, Marasmia patnalis (Bradley) (Lepidoptera: Pyralidae)

Noel C. Cruz

Date

10-1987

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

Testicular cells and meiotic chromosomes of male rice leaffolder, Marasmia patnalis (Bradley), were examined. The mean meiotic index was 43.78%. Interphase cells showed 4 differentiating forms. The nucleoplasmic index of the circular forms was 15.11%. A prolonged leptotene stage was observed consisting of 6 groups of leptotene cells classified according to their varying shapes, sizes of the nuclei, and characteristics of nuclear components. Small circular cells of group II occurred most frequently. Idiogram of pachynema chromosomes showed 14 linkage groups with relative lengths ranging from 0.35 to 7.50. The sex chromosomes, X and Y, measured 0.5 and 0.35, respectively. At diakinesis, varying chromosome numbers ranged from diploid number 16 to 33. The most commonly encountered diploid complement and therefore considered as the chromosome number of M. patnalis was 2n=28 (13IIA + XY). The male M, patnalis is heterogametic and capable of yielding two types of sperm gametes: 13IA + X and 13IA + Y.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

This document is currently not available here.

Share

COinS