Comparative karyotypes of two Philippine native orchid species: Aerides jarckiana Schltr. and Aerides odorata Lour.

Date

4-2004

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Celia B. Dela Viña

Abstract

KALALO, LORNA TACLA of the Philippines Los Banos. April 2004. Comparative Karyotypes of Two Philippine Native Orchid Species: Aerides jarckiana Schltr and Aerides odorata Lour. Adviser Prof Celia B. dela Viña ABSTRACT Chromosome behavior in mitosis, chromosome number and chromosome morphology were investigated in the two Philippine native orchids, namely Aerides jarckiana Schltr. and Aerides odorata Lour. using the acetocarmine squash technique Cells of the two species exhibited normal mitotic activity. Mitotic index was higher in A. odorata (72.02.%) compared to A. jarckiana (70.16%). Karyotypes from prometaphase stages in each species revealed the same diploid (2n) chromosome number of 38 Diakinesis in A. odorata showed 19 bivalents (1911s). The mitotic chromosomes were small, with relative lengths ranging from 0.035- 0.083 in A. jarckiana and 0 036 — 0.078 in A. odorata. Average chromosome arm ratio in A. jarckiana ranged from 1.56— 5 125 while that of A. odorata ranged from I. 83— 3.83. The chromosomes were found to have their centromeres in the median, submedian and subterminal region. In the two species of Aerides, chromosome pairs 10,15, and 17 were of different types while the rest of chromosome pairs were of the same type. Chromosome pairs 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, and 14 were submetacentric, and chromosome pairs 16 and 19 were acrocentric In A. jarckiana chromosome pairs 10, 15, 17 were submetacentric, metacentric, and acrocentric respectively. In A. odnrata chromosome 10 was acrocentric while 15 and 17 were submetacentric.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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