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This article in CS

  1. Vol. 48 No. 4, p. 1513-1522
    Received: Nov 29, 2007

    * Corresponding author(s): zoran.ristic@ars.usda.gov
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A Model for Prediction of Heat Stability of Photosynthetic Membranes

  1. Zoran Ristic *a,
  2. Urška Bukovnikb,
  3. P. V. Vara Prasadb and
  4. Mark Westc
  1. 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


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.

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