A comparison of the ontogenetic development of peroxidase and catalase isozymes in the macapuno and normal endosperm of coconut

Date

3-1977

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Dolores A. Ramirez

Abstract

The ontogeny of peroxidase and catalase isozymes in the macapuno and normal endosperm of coconut at six stages of development was determined using starch-gel electrophoresis. One hundred twenty samples from seven macapuno bearing trees (Mm) and 24 samples from normal coconut trees (F1.11) were used. The number of peroxidase isozymes in the normal and macapuno endosperm was the same at any given age but the number decreased as the endo-sperm matures. Per 1, Per 2 and Per 3 were the peroxidase isozymes found in the macapuno and normal endosperm. However, Per 3 appeared only during the onset of endosperm growth. Peroxidase activity in the normal was highest during the onset of endosperm formation; markedly declined during the second stage; gradually increased from the third to the fourth stage; was high again in the fifth stage; and declined at the last stage. In contrast, a more constant low peroxidase activity was found in the developing macapuno endosperm. The high peroxidase activity during the onset of endosperm formation and during maturity was not observed in the macapuno endosperm. No catalase isozymes were detected.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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