Cytology of Vigna glabrescens (M.M. and S.).

Date

3-1991

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Dolores A. Ramirez

Abstract

The chromosome behavior at meiosis of Vigna glabrescens (M. M. and S.) was studied using the the modified acetocarmine technique. the chromosome number of Vigna glabrescene is 2n=44. the only abnormality observed which occurred at low ferquencies was late disjunction of bivalents at anaphase I (5.71%) and the asynchronous congression of cchromosomes of the two daughter nuclei at metaphase II (4.61%). All the other stages exhibited normal behavior. Pachytene analyses of the chromosomes showed that chromosomes 1,8,10, 11 and 16 are metacentric; 2, 3, 4, 5, 6, 7, 9, 12, 13, 14, 15, 18, 19, 20, 21 are submetacentrics; while chromosome 17 is subtelocentric. their lengths range from 21.8 u to 76.2 u. The characteristic high frequency of bivalent formation during diakinesis and the normal chromosome behavior during the later meiotic stages favored the production of fertile gametes in Vigna glabrescenes. Pollen fertility counts revealed a percentage range from 54.12 to 97.8.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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