Genetic variability for resistance to sorghum downy mildew (Peronosclerospora sorghi) and Rajasthan downy mildew (P. heteropogoni) in the tropical/sub-tropical Asian maize germplasm |
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| Authors: | Tran Thi Oanh Yen BM Prasanna TAS Setty RS Rathore |
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| Institution: | (1) Division of Genetics, Indian Agricultural Research Institute, New Delhi, India; Box, 203, Mytho, Tiengiang, Vietnam;(2) Division of Genetics, Indian Agricultural Research Institute, New Delhi, India; Box, 203, Mytho, Tiengiang, Vietnam;(3) Rajasthan College of Agriculture, Udaipur, Rajasthan, India;(4) University of Agricultural Sciences, Regional Research Station, Mandya, Karnataka, India |
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| Abstract: | Downy mildews cause considerable damage to maize (Zea mays L.) worldwide, particularly in the tropical Asia. We have evaluated a set of 42 tropical/sub-tropical maize inbred lines
developed in different countries in Asia (India, Thailand and Philippines), and Mexico, for analysing the genetic variability
for resistance to sorghum downy mildew Peronosclerospora sorghi; SDM] and Rajasthan downy mildew P. heteropogoni; RDM]. Experiments were carried out in replicated trials under artificial infection in field conditions against SDM and RDM
at Mandya in Karnataka, India, and Udaipur in Rajasthan, India, respectively, during 1999 and 2000. The study resulted in
identification of five inbred lines offering consistent and strong resistance to both SDM and RDM, while several inbred lines
revealed resistance only to RDM. It was also revealed that the SDM-resistant inbreds are invariably resistant to RDM, while
the RDM-resistant inbreds might show differential responses to the SDM. The maize inbred lines identified in this study with
broad-spectrum resistance to downy mildews could be potentially useful for basic and applied research work on downy mildews
in tropical Asia.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | downy mildews genetic variability inbreds resistance Zea mays L |
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