Acta Agronomica Hungarica
Volume/Issue:
Volume 57: Issue 4
Spot blotch and terminal heat stress tolerance in south Asian spring wheat genotypes
Authors:
U. Rosyara

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,
S. Subedi Institute of Agriculture and Animal Science Rampur, Chitwan Nepal

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,
R. Sharma South Asia Regional Program Cimmyt — International Kathmandu Nepal

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, and
E. Duveiller Cimmyt 3- International D.F., Mexico Mexico

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Pages:
425–435
Online Publication Date:
21 Nov 2009
Publication Date:
01 Dec 2009
Article Category:
Research Article
DOI:
https://doi.org/10.1556/AAgr.57.2009.4.5
Keywords:
Cochliobolus sativus Sacc.; foliar blight; late planting stress; stress factor susceptibility index
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Terminal heat stress and spot blotch disease (caused by Cochliobolus sativus ) are the most important stresses responsible for significant yield losses every year in warm South Asian plains. Both of these stresses are very severe in late planted wheat, which is common in rice-wheat and rice-rice-wheat cropping systems. The development of genotypes tolerant to both stresses might be very useful for increasing yield and reducing yield losses. Information is limited on how different genotypes respond to both stresses (individually and combined) and on the degree of tolerance present in South Asian wheat genotypes. The study was done to evaluate the tolerance of South Asian wheat genotypes to both stresses by comparing the stress factor susceptibility index (SFSI). Eleven diverse South Asian genotypes were evaluated under spot blotch stress (non-fungicide protected plots), heat stress (late planted and fungicide protected), both stresses (non-fungicide protected and late planted) and normal planting situations (fungicide protected and normal season planted) at Rampur, Chitwan, Nepal. Both stresses reduced the grain yield and thousand-kernel weight (TKW), but not other yield components, including grains/spike and spikelets/spike. Genotypes BL 1473, Gautam and NL971 were moderately to highly tolerant to both types of stress. Generally genotypes that are tolerant or resistant to spot blotch also showed tolerance to heat stress, suggesting a common physiological mechanism to combat both stresses in tolerant genotypes.

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Cover Acta Agronomica Hungarica
Acta Agronomica Hungarica
Print ISSN:
0238-0161
Online ISSN:
1588-2527

Acta Agronomica Hungarica
Language English
Russian
German
French
Size  
Year of
Foundation		 1950
Publication
Programme		 ceased
Volumes
per Year		  
Issues
per Year		  
Founder Magyar Tudományos Akadémia   
Founder's
Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0238-0161 (Print)
ISSN 1588-2527 (Online)

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