Cytology of ipil-ipil psyllid, Heteropsylla cubana crawford (Homoptera: Psyllidae) infesting the native and the giant ipil-ipil varieties (Leucaena leucocephala (Lam) de witt).

Date

3-1989

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

Spermatogenic cells and chromosomes during different stages of meiosis were investigated. The two populations of H. cubana infesting the native and giant L. leucoceohala exhibited the following cellular and chromosomal features: frequency of binucleated cells higher in native (2.24%) than in giant (0.9(1%); predominance of round cells (42%) 1--0llowed by oval (36%), than by elongate (27%) in native; oval cells (36%) were dominant in giant, followed by round and elongate (32% each) nucleoplasmic index -3.7% in native , 5.5% in giant; meiotic index-26.8% (native) and 50.9% (giant); relative lengths at pachvtene ranged From 0.042-0.126: autosomes, 0.046-0-126, sex chromosomes, 0.042 (giant), and 0.028-0.120: autosomes. 0.036-0.128, sex chromosome, 0.028 (native); at diakkinesis diploid chromosomes complement 2n=25(1211-X0) (Cr); relative lengths of chromosomes ranged from 0.079-0.0108 (native) and 0.050-0.107 (giant). Chromosomes clumping was observed at Metaphase I and Telophase I in both insect populations. Laggards and missing bivalents were observed in Cubana From the native variety, none from the giant variety, Second meiotic division was equational forming four haploid nuclei.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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