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Published online 1 July 2008
Published in Crop Sci 48:1513-1522 (2008)
© 2008 Crop Science Society of America
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A Model for Prediction of Heat Stability of Photosynthetic Membranes

Zoran Ristica,*, Urska Bukovnikb, P. V. Vara Prasadb and Mark Westc

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
c USDA-ARS, Northern Plains Area Office, 2150 Centre Ave., Bldg. D, Fort Collins, CO 80526

* Corresponding author (zoran.ristic{at}ars.usda.gov).

A previous study revealed a positive correlation between heat-induced damage to photosynthetic membranes (thylakoid membranes) and chlorophyll loss. In this study, we exploited this correlation and developed a model for predicting thermal damage to thylakoids. Prediction is based on estimation of the ratio of constant chlorophyll a fluorescence (O) and the peak of variable fluorescence (P) (O/P). The model was developed using 12 cultivars of hexaploid winter wheat (Triticum aestivum L.). It was tested in six genotypes of hexaploid wheat, 25 genotypes of tetraploid wheat (T. turgidum L.), and 20 genotypes of maize (Zea mays L.). Predictive ability was assessed by analyzing the relationship between the predicted and measured O/P. The model adequately predicted O/P and thereby the heat stability of thylakoid membranes in all genotype groups with high coefficients of determination (r2 > 0.80). This model could be used as an easy and inexpensive means for detection of the structural and functional state of photosynthetic membranes in wheat and maize, and possibly other crops, in hot environments.

Abbreviations: O, constant chlorophyll a fluorescence • P, peak of variable fluorescence • PPF, photosynthetic photon flux • PSII • Photosystem II • RMSPR, prediction root mean square error

The authors thank Dr. Anton Tajnsek, University of Ljubljana, Slovenia, for providing seeds of winter wheat cultivars Reska and Gorolka, and Dr. Juan Juttner, the University of Adelaide, Australia, for providing seeds of spring wheat cultivars Kukri, RAC-875, and Excalibur. The authors also thank Dr. Bikram S. Gill, Kansas State University, for his help in obtaining seeds of genotypes of tetraploid wheat from ICARDA, Syria. The authors are grateful to Dr. K. Raja Reddy, Mississippi State University, and Dr. Matthew A. Jenks, Purdue University, for critical reading of the manuscript. This publication is approved as Kansas Agriculture Experiment Station No. 08-110-J. Mention of a trademark or proprietary product does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable.

All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher.

Received for publication November 29, 2007.




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