Root and coleoptile growth and root apical characteristics of irrigated and rainfed rice seedlings at varying oxygen levels.

Date

4-1993

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Arcelia A. Alejar

Abstract

LAPIDARIO, EDWIN BARIRING. College of Arts and Sciences, University of the Philippines, Los Banos. April, 1993. ROOT AND COLEOPTILE GROWTH AND ROOT APICAL CHARACTERISTICS OF IRRIGATED AND RAINFED RICE SEEDLINGS AT VARYING OXYGEN LEVELS.

Major Adviser: Dr. Arcelia A. Alejar

Oxygen is important in seed germination and root growth. Often, oxygen is limited in cultivation of irrigated rice. Two rice cultivars were used to compare the effect of oxygen concentration on root and coleoptile growth and root apical characteristics between Azucena (rainfed) and IR72 (irrigated). Seeds germinated at 0% and 5% 02 concentration did not produce roots but coleoptile growth was observed in both cultivars. Increasing the 02 levels to 10% and 21% showed increases in lengths of coleoptile, root and the meristem size of the root apex. Differentiation was significantly earlier in both cultivars under limited oxygen supply indicated by the shorter distance from the center of the proximal end of the meristem to the first root hair given 10% 02. The present results supported previous reports that roots are longer and more vigorous in rainfed cultivars compared to irrigated or lowland rice. This is shown, in part, by the lesser inhibition of root and coleoptile growth under hypoxia in Azucena, a rainfed cultivar. The earlier differentiation in root apex observed in both cultivars suggest an adaptive response to oxygen stress..

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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