Comparative karyotypes of two native orchids: Dendrobium anosmum Lindl. and D. primulinum Lindl.

Date

4-2004

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Celia B. Dela Viña

Abstract

Mitotic behavior, chromosome number, and chromosome characteristics were determined in two native orchids, Dendrobium anosmum Lindl. and D. primulinum. Normal mitotic stages were observed from the acetocarmine squash preparations of the root tip cells of the two species. Mitotic index was high at 71.71% in D. allOSMUM and 62.61 in D. primulinum. For the two species, the karyotypes revealed a diploid chromosome number of 2n = 38. The average relative length ranged from 0.0328 to 0.0815 in D. anosmum and 0.0332 to 0.0776 in D. primulinum. Chromosome types were either submetacentric or metacentric. Chromosome pairs 1, 4, 8, 11 (21.01%) were submetacentric while the rest (78.95%) were metacentric in D. anosmtan. For D. primulinum, chromosome pairs 3, 6, 7 ,8, 12, and 13 (31.58%) were submetacentric while the rest (68.42%) were metacentric. In the two species of Dendrobium, chromosome pairs I, 3, 4, 6, 7, 11, 12, and 13 were of different types while the rest were of the same types. Chromosome pair 8 was submetacentric while pairs 2, 5, 9, 10, 14, 15, 16, 17, 18, and 19 were metacentric for both species.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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