Morphological and cytological studies of five Saccharum hybrids from the Philippines.

Date

3-2003

Degree

Bachelor of Science in Biology

Major Course

Major in Cell Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Merlyn S. Mendioro

Abstract

Morphology and cytology of five Saccharum hybrids (Phil 76-3961, Phil 80-5874, Phil 83-333-4097, Phil 83-700-0085 and Phil 89-1233) from the Philippines were studied. Forty-five out of 53 morphological characteristics are variable. These includes variation in plant habit (reclining- Phil 76-3961, Phil 80-5874, Phil 83-333-4097, Phil 89-1233; intermediate- Phil 83-700-0085), tillering density (intermediate- Phil 76-3961, Phil 80-5874, Phil 83-333-4097, Phil 89-1233; profuse- Phil 83-700-0085), color, length and width of leaf blade, waxiness of leaf sheath (light- Phil 76-3961, Phil 89-1233; medium-Phil 83-333-4097, Phil 83-700-0085; heavy- Phil 80-5874), presence of corky patches, and internode shape (bobbin- Phil 76-3961; obconoidal- Phil 80-5874 ; cylindrical- Phil 83-333-4097, conoidal- Phil 83-700-0085 ,Phil 89-1233 ). The stem epidermal patterns of all the Saccharum hybrids did not contain silica cells. All belong to Type V with 0-20% cork-silica pairs. The range in chromosome number in the three hybrids is 2n=98-110. Phil 80-5874 is the only accession with the chromosome number of 2n=98-114 while Phil 79-3961 has 2n=100-110. Bivalent formations are regular and prevalent. There were also univalents observed but in a very low frequency (14.8%) compared to bivalents (85.2%). No multivalents were observed. At Metaphase I, an average of 10% showed non-congressions. Presence of laggards and non-congressions were also observed at Anaphase I and Telophase I wherein among all accessions, Phil 89-1233 showed the highest average occurrence of laggards (14%) and non-congressions (10%).

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

This document is currently not available here.

Share

COinS