Comparative karyotypes of two Philippine native orchids, Dendrobium anosmum var. dearei Lindl. and Dendrobium aphyllum (Roxburgh) Fisher

Date

4-2006

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Celia B. Dela Viña

Abstract

Chromosome characteristics based on mitotic behavior, arm ratio, relative length, and types according to centromere position were determined in two Philippine native orchids, namely Dendrohium anosmum var dearei Lindl. and D. aphyllum (Roxburgh) Fisher. Normal mitotic stages were observed from the acetocarmine squash preparations of the root tip cells. Mitotic index was higher at D. aphyllum (30.47%) than D. anosmum var dearei (21.87%). The karyotypes revealed a diploid chromosome number of 2n = 38 in the two species. The average relative chromosome lengths were almost similar ranging from 0.035 to 0.081 in D. anosmum var dearei and 0.030 to 0.080 in D. aphyllum. Based on the arm ratio, all the chromosomes in the two Dendrobium species were metacentric.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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