A cytological study of the F1 hybrids between bulu and upland ecotypes of rice Oryza sativa L.

Date

3-1986

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Liwayway M. Engle

Co-adviser

Te-Tzu Chang

Abstract

The meiotic behavior, chromosome morphology, and pollen fertility of two F1 hybrids between bulu and upland crosses were studied and compared to those of the parents. Meiotic behavior and chromosome morphology were studied using a modified iron-acetocarmine technique., while the pollen fertility studies were done using 12KI. The meiotic behavior as well as chromosomal aberrations observed were found to be similar in both the parent and the hybrid populations. The most frequently observed abnormalities were terminal and segmental loose pairings in pachynema, quadrivalents and univalents in diakinesis and metaphase I, late migrating and precociously disjoining chromosomes in metaphase I, and, bridges and laggards in anaphase I. Though some of the observed meiotic abnormalities may affect the fertilities of these two populations, the data suggests that the cause of hybrid sterility in bulu-upland crosses is genic in nature.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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