HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Ristic, Z. Articles by Prasad, P.V. V. Search for Related Content PubMed Articles by Ristic, Z. Articles by Prasad, P.V. V. Agricola Articles by Ristic, Z. Articles by Prasad, P.V. V. Related Collections Temperature Stress Wheat

Correlation between Heat Stability of Thylakoid Membranes and Loss of Chlorophyll in Winter Wheat under Heat Stress

^a USDA-ARS, Plant Science and Entomology Research Unit, 4008 Throckmorton Hall, Manhattan, KS 66506
^b Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506

View larger version (45K): [in this window] [in a new window]   Figure 1. (A) The ratio of constant fluorescence and the peak of variable fluorescence (O/P) and (B) chlorophyll content in flag leaves from 12 cultivars of winter wheat under heat stress conditions. Chlorophyll a fluorescence and chlorophyll contents were measured on the same flag leaves after 0, 8, 10, 12, 14, and 16 d of exposure to heat stress. Increases in O/P indicate damage to thylakoid membranes, the greater the damage the lower the tolerance to heat stress (Ristic and Cass, 1993). Plotted data are from Experiment 1. Bars indicate ±standard errors; n = 5. Similar results were observed in a duplicate experiment.

View larger version (15K): [in this window] [in a new window]   Figure 2. Correlation between the ratio of constant fluorescence and the peak of variable fluorescence (O/P) and chlorophyll content expressed as percentage of control (plants not exposed to heat) in the flag leaf from 12 cultivars of winter wheat. Data from five replicate plants of each cultivar were averaged and used for correlation analysis. Plotted data are from Experiment 1; n = 12. Similar results were obtained in a duplicate experiment. HS, heat stress.

View larger version (13K): [in this window] [in a new window]   Figure 3. Correlation between the ratio of constant fluorescence and the peak of variable fluorescence (O/P) and chlorophyll content in the flag leaves of 12 cultivars of winter wheat. Data represent an average of two experiments in which in each experiment data from five replicate plants of each cultivar were averaged. (A) The chlorophyll content in heat-stressed plants, measured on Days 8, 10, 12, 14, and 16 of heat treatment, was expressed as percentage of that in control (plants not exposed to heat stress). (B) The chlorophyll content in heat-stressed plants, measured on Days 8, 10, 12, 14, and 16 of heat treatment, was expressed as percentage of chlorophyll content measured in the same plants at the beginning of heat stress (Day 0 of heat stress). Data for all days of heat stress treatment when fluorescence and chlorophyll content were measured are plotted on the same graph (n = 60).