Progress in Wheat Resistance to Spot Blotch in Bangladesh

Spot blotch, caused by Cochliobolus sativus, is considered one of the most destructive diseases of wheat (Triticum aestivum) in the warm areas of South Asia. Over the past 20 years, wheat breeding efforts in the region have improved spot blotch resistance in susceptible commercial cultivars. This st...

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Bibliographic Details
Published in:Journal of phytopathology 2006, Vol.154 (1), p.16-22
Main Authors: Siddique, A.B, Hossain, M.H, Duveiller, E, Sharma, R.C
Format: Article
Language:English
Subjects:
Biological and medical sciences
Bipolaris sorokiniana
breeding lines
Cochliobolus sativus
disease resistance
farmer participatory research
field experimentation
foliar blight
Fundamental and applied biological sciences. Psychology
fungal diseases of plants
Fungal plant pathogens
genetic resistance
grain yield
leaf spotting
Phytopathology. Animal pests. Plant and forest protection
plant breeding
plant pathogenic fungi
Triticum aestivum
wheat
yield loss
yield losses
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Summary:Spot blotch, caused by Cochliobolus sativus, is considered one of the most destructive diseases of wheat (Triticum aestivum) in the warm areas of South Asia. Over the past 20 years, wheat breeding efforts in the region have improved spot blotch resistance in susceptible commercial cultivars. This study assessed resistance and spot blotch-induced yield losses in newly released wheat cultivars developed in Bangladesh since the release of the landmark wheat variety 'Kanchan'. Replicated field studies were conducted during the 2003 and 2004 wheat seasons at two sites: a farmer's field and a research station in a warm region of Bangladesh where spot blotch has been a serious problem. Spot blotch affected 60% of the crop and caused yield losses of from 2% to 22%. Disease severity and disease-induced grain yield reductions were less in wheat genotypes developed since 1983, with a corresponding trend towards higher yield in newly developed varieties. The level of resistance to spot blotch in the new cultivars and advanced breeding lines represents considerable progress in breeding for resistance over the past two decades.
ISSN:0931-1785
1439-0434
DOI:10.1111/j.1439-0434.2005.01049.x