Interactive effects of elevated Co2 and temperature on seedling root growth and root apical characters of two rice cultivars

Date

4-1996

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Arcelia A. Alejar

Abstract

MACABATA, LOVE JOY MARIANO. University of the Philippines at Los Banos. B.S. Biology, April 1996. The Interactive Effects of Elevated CO2 and Temperature on Seedling Root Growth and Root Apical Characters of Two Rice Cultivars.

Adviser: Dr. Arcelia A. Alejar

The effect of global warming contributed by the predicted rise in atmospheric CO2 was assessed in relation to the seedling root growth and root apical characters. Two contrasting rice cultivars were used namely the New Plant Type (NPT) and check cultivar, IR-72. They were grown for one week inside the plastic chambers in the field provided with computer controlled three levels of CO, and two levels of temperature. Results showed that root elongation in the two cultivars was reduced given twice the amount of ambient CO, and ambient temperature (30° C) or at 4C higher. This observation was associated with drastic reduction in meristem size length, diameter, and volume) in IR-72 but not in NFL The high temperature treatments also tend to induce earlier root hair differentiation in IR-72 at all CO2 levels. Similarly, formation of root hairs close to the meristem region was significantly observed in NPT but only at the highest CO2 level (ambient + 300 ppm) and ambient temperature treatment. Microscopic examination of the root tip given the same treatment also revealed formation of many lateral root primordia in the same cultivar. The number of nodal roots and shoot height of the two cultivars were unaffected by different treatments. the above results suggest that acclimation response to high CO2, and high temperature exhibited during the early cellular on the root tips of NPT but not in IR72.

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