Inheritance studies of Sterility mosaic disease (SMD) resistance in vegetable type pigeonpea (Cajanus cajan (L.) Millsp.)

Ganapathy, K.N. and Gowda, M.B. and Ajay, B.C. and Venkatesha, S.C. and Gnanesh, B.N. and Gomashe, S.S. and Babu, P. and Girish, G. and Prasad, P.S. and Veerakumar, G.N. and Patil, J.V. (2012) Inheritance studies of Sterility mosaic disease (SMD) resistance in vegetable type pigeonpea (Cajanus cajan (L.) Millsp.). Australian Journal of Crop Science, 6 (7). pp. 1154-1158.

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Sterility mosaic disease (SMD) is one of the most destructive diseases of the Indian subcontinent causing severe reduction in yield. Development of resistant varieties is an effective management strategy for which understanding the nature of inheritance of disease inheritance is a prerequisite. The objective of this work was to study the nature of inheritance of SMD in resistant (BRG 3 and ICP 7035) and susceptible (ICP 8863 and TTB 7) genotypes. SMD incidence observed in parents, F1 and F2 generations indicated resistance to be controlled by recessive gene and appeared to be monogenic in cross TTB 7 × BRG 3 and governed by two independent non-allelic genes exhibiting complementary epistasis in cross ICP 8863 × ICP 7035. Expression of at least one SMD gene in homozygous recessive condition was necessary for resistant phenotype in the above mentioned crosses. Resistant × resistant and susceptible × susceptible F2 individuals showed no segregation indicating function of same loci/ linked loci to govern resistance and susceptibility in the parents studied. Visual observations recorded for leaf colour and texture revealed that the leaves of resistant genotypes were dark green and leathery textured while, that of susceptible individuals were light green and non-leathery indicating leaf traits to be associated with SMD resistance in the parents studied. The putative association of dark green leathery leaves with SMD resistance could make significant implications for pigeonpea improvement by providing opportunity for indirect selection of leaf traits for development of resistant cultivars.

Item Type: Article
Uncontrolled Keywords: Cajanus cajan, inheritance, sterility mosaic disease, dark green leathery leaves.
Author Affiliation: University of Agricultural Sciences, Bangalore 560 065, India
Subjects: Plant Protection
Statistics and Experimentation > Experimentation
Divisions: Pigeonpea
Depositing User: Mr B Krishnamurthy
Date Deposited: 09 Feb 2013 13:59
Last Modified: 09 Feb 2013 13:59
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