Morphological and cytological studies of three interrelated Saccharum hybrids from California

Date

4-2003

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Celia B. Dela Viña

Abstract

Morphological characteristics. stem epidermal patterns, chromosome number at Diakinesis and chromosome behavior in meiosis were determined in three interrelated Saccharum hybrids from California namely: CP 52-68. CP 70-1133, CP 72-1210. Morphological data gathered from the three hybrids showed similarities in plant habit. tops characteristics. trashiness. leaf sheath color, auricle shape and presence of leaf scar. CP 52-68 and CP 72-1210 had greater similarities compared to CP 52-68 and CP 70-113. and to CP 72-1210 and CP 70-1133. The most notable differences were in the shape of the outer auricle and bud. Although each of the three hybrids exhibited distinct stem epidermal patterns. they can all be classified under type V epidermis which has 0-20% percentage of paired cork-silica cells. Chromosome pairing in the hybrids was generally normal with bivalent associations predominating. Chromosome number ranged from 2n=104-110 in CP 52-68. 2n=70-80 in CP 70-1133, and 2n=80-100 in CP 72-1210. Chromosome number with the highest frequency was 2n=104 in CP 52-68 (86%), 2n=70 for CP 70-1133 (82%). and 2n=80 in CP 72-1210 (78%). The only meiotic abnormality found were laggards at Anaphase I, which constituted 6%, 4%, and 2% in the total cells observed in CP 52-68. CP 72-1210. and CP 70-1133 respectively. Chromosomal transmission was deduced to be n + n.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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