, Volume 174, Issue 3, pp 377–390 | Cite as

The effect of spot blotch and heat stress on variation of canopy temperature depression, chlorophyll fluorescence and chlorophyll content of hexaploid wheat genotypes

  • Umesh R. Rosyara
  • Sushil Subedi
  • Etienne Duveiller
  • Ram C. Sharma


Spot blotch, caused by Cochliobolus sativus (Ito and Kurib.) Drechsler ex Dastur, and heat stress are two important stresses of bread wheat (Triticum aestivum L.) causing substantial yield reduction in the warm areas of South Asia. These two stresses put pressure on at least 25 million hectares of wheat areas worldwide. This study was conducted to examine variation in physiological traits and its association with heat and spot blotch. Eleven diverse bread wheat genotypes were evaluated in replicated field trials under spot blotch epidemics and heat stress conditions in 2006 and 2007 at Rampur, Nepal. Canopy temperature depression (CTD), chlorophyll fluorescence (CF), chlorophyll content, percent disease leaf area, yield and yield components were recorded. Heat and spot blotch individually reduced CTD, CF, chlorophyll content, grain yield (GRY), and thousand kernel weight (TKW), with greater reductions recorded under combined stress. Genotypes showing lower GRY or TKW loss due to spot blotch also exhibited lower yield loss due to heat stress or combined heat and disease stress, suggesting an association between tolerance mechanisms to the stresses. The physiological traits chlorophyll content, CF and CTD showed higher correlations with GRY and TKW than with area under disease progress curve (AUDPC) suggesting their potential application in screening for heat and spot blotch tolerant genotypes. Genotypes with lower disease showed the highest values for chlorophyll content, CF and CTD. Our findings provide new information on the relationship of these physiological traits with spot blotch resistance and heat tolerance when examined in the same study. The physiological traits studied have potential application in integrative indirect selection criteria for improving spot botch and heat tolerance in wheat.


Bipolaris sorokiniana Cochliobolus sativus Triticum aestivum Foliar blight Terminal heat stress Physiological traits Soil plant analysis development SPAD 



Area under the canopy temperature depression curve


Area under disease progress curve


Area under chlorophyll fluorescence decline curve


Area under SPAD decline curve


Chlorophyll fluorescence


Canopy temperature depression


Eastern Gangetic plains


Grain yield


Soil plant analysis development


Thousand kernel weight



The research was supported by International Foundation for Science (IFS), Sweden. We thank the anonymous reviewers and Dr. Mohammed Karrou, ICARDA for suggestions for improving the manuscript. We thank Professor Leon Wrage, South Dakota State University, Brookings, South Dakota, USA for language revision.


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Umesh R. Rosyara
    • 1
  • Sushil Subedi
    • 2
  • Etienne Duveiller
    • 3
  • Ram C. Sharma
    • 4
  1. 1.Plant Science DepartmentSouth Dakota State UniversityBrookingsUSA
  2. 2.Institute of Agriculture and Animal ScienceRampur, ChitwanNepal
  3. 3.CIMMYT, Global Wheat ProgramMexicoMexico
  4. 4.ICARDA, Central Asia and the Caucasus Regional ProgramTashkentUzbekistan

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