Cytogenetics of the mango leafhopper, Idioscopus clypealis (Lethierry) (Hemiptera : Cicadellidae)

Date

7-2002

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Rita P. Laude

Abstract

Cytogenetic analysis of mango leafhopper, Idioscopus clypealts Lethierry, using Carnov's-fixed, lacto-aceto-orcein squashed testes revealed distinct qualitative and quantitative cytological and karyomorphological features. Chromosome number of n-10 was observed during Diakinesis. Male Idioscopus clypealis was found to be heterogametic, 2n=20 (9II + XO). Meiotic indices ranged from 85.00 to 94.00 %, the average index was 89.70%. Chromosomes were holocentric with a relative mean length of diakinetic chromosomes ranging from 0.58 to 1.00, the average relative length was 0.75. Relative mean length of chromosomes at Pachytene ranged from 0.23 to 1.00, the average relative length was 0.54. Clumping of the chromosomes was noted in Metaphase 1 cells (63%) and Metaphase II cells (30%). In addition, bridge (31%) was observed among the Anaphase 1 cells. Although chromosomal abnormalities were noted, abnormalities decreased as meiosis progressed thus, the population density of the mango leafhopper remains high.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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