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Genetics of resistance to early blight disease in crosses of wild derivatives of tomato

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Title Genetics of resistance to early blight disease in crosses of wild derivatives of tomato
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Creator A.K. Singha, N. Raib,∗, R.K. Singha,b, S. Sahac, R.K. Raic, R.P. Singha
 
Subject Tomato,Wild accessions, Resistance to early blight (EB), Heterosis breeding, Inbreeding depression Inheritance
 
Description Not Available
The objective of this study was to determine the heterosis, inbreeding depression and genetics for yield,quality and resistance to early blight in tomato. Consequently, twenty inter-specific crosses of tomatowere developed by crossing five susceptible cultivars and four wild resistant accessions and tested infield and glasshouse conditions for early blight (EB) resistance. Biochemical responses were also critically studied both in parents and hybrids. All the crosses showed moderately susceptible reaction except fivecrosses of EC-520061 (Solanum habrochaites). Biochemically the wild parents exhibited better resultsover susceptible parents but their hybrids showed moderate reaction for early blight resistance. Highlevel of phenol was found both in resistant parents and hybrids. Among the 20 crosses, those made byEC-520061 and H-88-78-1 manifested resistance capacity, low heterosis and high inbreeding depressionfor EB disease. For yield associated traits most of the crosses expressed high heterosis and low inbreed-ing depression which indicated better yield capacity. The crosses made by EC-520061 (S. habrochaites) segregated in 3:1 (resistant:susceptible) Mendelian ratio and indicated monogenic dominant and addi-tive gene effects. Remaining crosses showed 1:2:1 (resistant:intermediate:susceptible) genetic ratio andindicated heterozygous nature of crosses mediated by multiple genes or QTLs. This fact can be utilized infuture tomato breeding program for developing resistant varieties against EB disease.
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Date 2018-11-24T08:17:24Z
2018-11-24T08:17:24Z
2017-01-01
 
Type Research Paper
 
Identifier 7
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http://krishi.icar.gov.in/jspui/handle/123456789/13094
 
Language English
 
Relation Not Available;
 
Publisher Scientia Horticulturae, ELSEVIER