The cytology of Kagawara 'Yuthayong beauty' : a trigeneric orchid hybrid

Date

4-1985

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Teresita L. Rosario

Abstract

The sterility/non-fruit setting of Kagawara was studied through meiotic observations in pollen mother cells. Various types of chromosome abnormalities were observed at meiosis I and II. They include non-congression, lagging chromosomes, bridges, multiple spindles and polyspore formation. Mitotic behavior was similar to that observed at meiosis. Laggards, non-congression and bridge-like formation were also present. These findings further describe the hybrid nature of Kagawara. Pollen fertility test indicated the presence of starch in pollen grains but could not be considered as a sign of fertility. The pollen grains stained lightly and exhibited a great varia-bility in size and shape. Pollen germination test gave conclusive evidence that Kagawara was male sterile. A very low percentage of the pollen grains germinated and the pollen tubes were distorted and inhibited, Kagawara therefore, has very limited potential as parent for further orchid improvement.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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