Karyotype analysis of sambong, Blumea balsamifera (L.) DC. (Synandrae : Compositae)

Date

4-1992

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Adelina A. Barrion

Abstract

PALO, MA. GERARDA P. University of the Philippines at Los Banos, B.S. Biology, April, 1992. Karyotype Analysis of Sambong, Blumea balsamifera (L.) D.C. (Synandrae:Compositae).

Adviser: Dr. Adelina A. Barrion

The M-phase of root tip cells of B. balsamifera occurred from 11:45 a.m. to 12:00 noon. Its mitotic index was 15%. The sequential stages of regular mitosis in root tip cells of B. balsamifera were -observed and described. Karyotype analysis of premetaphase somatic chromosomes revealed that the chromosomes were monocentric. The diploid chromosome number (2n) of B. balsamifera was 18. These chromosomes were grouped into two based on the location of the centromere. Group I consisted of eight (8) pairs of metacentric chromosomes(88.9%) and Group II was composed of a pair of submetacentric chromosomes (11.1%). The relative lengths of the Group I chromosomes were 0.08, 0.06, 0.06, 0.06, 0.05, 0.05, 0.05 and 0.04, while for Group II chromosomes, the relative length was 0.04. The average centromeric index for pairs 1-8 ranged from 41.89% to 45.58%; the centromeric index for pair #9 was 32.82%. The average arm ratios for pairs 1-8 were 1.30, 1.36, 1.34, 1.32, 1.25, 1.28, 1.35, and 1.24 while the average arm ratio of pair M9 was 2.08.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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