The cytology of Annona squamosa L., Annona muricata L., and Rollinia deliciosa Saff.

Date

6-1980

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Dolores A. Ramirez

Co-adviser

Violeta N. Villegas

Abstract

The study revealed that the chromosome number of A. squamosa L., A. muricata L. R. deliciosa Saff. are 2n = 14, 2n = 14 and 2n =48 respectively. Both Annona species exhibited a fairly normal meiotic behavior while R. deliciosa Saff. has a very disturbed meiosis. The two Annona species aside from having the same chromosome number have almost the same chromosome morphology. This indicates their close relationships. Both have two metacentric chromosomes, six submetacentric chromosomes. Secondary constrictions were found in the long arms of the 9th and 10th subacrocentric chromosomes of these two species. Differences in their chromosome lengths were observed: A. squamosa L. have chromosome lengths ranging between 3 to 5 u while A. muricata L. have chromosome lengths between 2 to 6 u. The chromosome morphology of R. deliciosa Saff. on the other hand, was found to be different from the Annona species. Its 48 chromosomes have lengths ranging between 1 to 4 u. Two of these 48 chromosomes were metacentric, 14 were submetacentric, 16 were subacrocentric and 16 were acrocentric. Unlike the the Annona species, the secondary constrictions were mostly located in the short arms of the two subacrocentric chromosomes. The secondary constrictions were also greater in number in this species compared to those in the Annona species The distributed meiotic behavior of R. deliciosa Saff. indicated that it is a hybrid but the differences in chromosomes morphology and number between this species and the two Annona species show that it may not be the putative hybrid of A. squamosa L. and A. muricata L. the chromosome behavior of R. deliciosa specially at diakinesis also revealed that this species is probably of fairly recent origin.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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