Identification of new source of white rust resistance in Indian mustard [B. juncea (L.) Czern & Coss] from germplasm collected from Uttarakhand hillsPantnagar Journal of Research, Volume - 19, Issue - 2 ( May-August, 2021)
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Indian mustard (Brassica juncea L. Czern & Coss) is a major oilseed crop with more than 90% share in the acreage of oilseed brassicas grown in India. White rust is one of the major diseases that hamper the productivity and production to a considerable level. One collection (GP-11-222) from village-Van, Block-Dewal of district Almora (Altitude 7612 msl, Longitude 790 37.454; Latitude 300 11.45) grown in the field during 2011-12 showed segregation for several traits including reaction against white rust disease. The crop season during 2011-12 at Pantnagar was highly congenial for development of white rust disease therefore, helped in screening of germplasm for the diseases under natural conditions in the field. As a result of which 22 plants showing resistance to white rust were selected. Screening of descendants of selections from 2011-12 to 2016-17 in the field under artificially inoculated condition resulted into 14 promising lines. During 2015-16 and 2016-17 these 14 selected lines were screened in the field as well as in the glasshouse under controlled condition by the pathologist. All the 14 lines were found completely free from white rust infection in field condition while at cotyledonary stage four progenies have shown immune reaction and six progenies have shown resistance reaction. At true leaf stage only four progenies have shown resistance reaction. Out of these four progenies, only one progeny had also shown at par performance in terms of morphological traits. Genetic study indicated presence of single dominant gene conferring resistance against white rust. Allelic study showed presence of a different source of resistance gene in the identified line. Further studies on its molecular verification need to be done.
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