title: Identification of Novel Source of Resistance and Differential Response ofAlliumGenotypes to Purple Blotch Pathogen,Alternaria porri(Ellis) Ciferri.
abstract: Purple blotch, caused byAlternaria porri(Ellis) Cifferi, is a serious disease incurring heavy yield losses in the bulb and seed crop of onion and garlic worldwide. There is an immediate need for identification of effective resistance sources for use in host resistance breeding. A total of 43Alliumgenotypes were screened for purple blotch resistance under field conditions.Allium cepaaccession 'CBT-Ac77' and cultivar 'Arka Kalyan' were observed to be highly resistant.In vitroinoculation of a selected set of genotypes withA. porri, revealed that 7 days after inoculation was suitable to observe the disease severity.In vitroscreening of 43 genotypes for resistance toA. porrirevealed two resistant lines. An additional 14 genotypes showed consistent moderate resistance in the field as well asin vitroevaluations. Among the relatedAlliumspecies,A. schoenoprasumandA. royleishowed the least disease index and can be used for interspecific hybridization with cultivated onion. Differential reaction analysis of threeA. porriisolates (Apo-Chiplima, Apn-Nasik, Apg-Guntur) in 43 genotypes revealed significant variation among the evaluatedAlliumspecies (P= 0.001). All together, the present study suggest that, the newly identified resistance sources can be used as potential donors for ongoing purple blotch resistance breeding program in India.
authors.affiliation: Functional Genomics Laboratory, Centre of Biotechnology, Siksha O Anusandhan University, Bhubaneswar 751003, India.
authors.forename: Satyabrata
authors.initials: S
authors.lastname: Nanda
authors.affiliation: Functional Genomics Laboratory, Centre of Biotechnology, Siksha O Anusandhan University, Bhubaneswar 751003, India.
authors.forename: Subodh Kumar
authors.initials: SK
authors.lastname: Chand
authors.affiliation: College of Horticulture, Orissa University of Agriculture & Technology, Bhubaneswar 751003, India.
authors.forename: Purander
authors.initials: P
authors.lastname: Mandal
authors.affiliation: Department of Vegetable Science, Orissa University of Agriculture & Technology, Bhubaneswar 751003, India.
authors.forename: Pradyumna
authors.initials: P
authors.lastname: Tripathy
authors.affiliation: Functional Genomics Laboratory, Centre of Biotechnology, Siksha O Anusandhan University, Bhubaneswar 751003, India.
authors.forename: Raj Kumar
authors.initials: RK
authors.lastname: Joshi
keywords: Allium spp.; Alternaria porri; purple blotch