Cytology of ipil-ipil (Leucaena leucocephala (Lam.) De Wit) Psyllid, Heteropsylla cubana Crawford (Homoptera: Psyllidae.

Date

3-1988

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

Lacto-aceto-orcein squash preparations of reproductive cells from H. cubana revealed the following cellular and chromosomal features: three interphase cell types: oval (48.3%), round (33.8%) and elongate (17.9%); meiotic index, 54.3%; nucleoplasmic index, 9.08%; three differentiating leptotene nuclei; complete disappearance of nucleus and nuclear membrane at zygotene stage; relative lengths of the pachytene chromosomes ranged from 0.042 to 0.126: autosomes, 0.046 to 0.126 and sex chromosomes, 0.042; at diakinesis, the diploid chromosome complements were 2n = 25 (12 IIA + XO) and 2n (q) 26 (12 IIA + XX), and the relative lengths of the chromosomes ranges from 0.055 to 0.099. The sex determining mechanism was XX (s): XO (0. Chromosome clumping were observed at metaphase I (41.2%) and at telophase I (58.8%). The chromosomes at early anaphase I exhibited an "X" formation as a result of delayed separation of midway bivalents. Furrow formation at telophase I was very evident. 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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