Genetic Analysis of Powdery Mildew Resistance, Seed Yield and its Component Traits in Sunflower (Heliantus annus L.)
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Date
2013
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Publisher
UAS, Dharwad
Abstract
Investigations have been carried out in sunflower in two seasons to study the
Heterosis and combining ability for various yield and component traits through partial
diallele analysis and inheritance pattern of powdery mildew resistance and gene actions
governing nine quantitative traits using six generation mean analysis in the experimental
block of Department of Genetics and Plant Breeding at the Main Research Station, University
of Agricultural Sciences, Dharwad during kharif 2012 and rabi 2012, respectively.
The study clearly revealed the major role of additive and non-additive gene actions in
respect of for yield and yield related traits and also indicated the role of interactions of
genetic components like additive x additive (i) effects and dominant x dominant (l) effects for
yield and yield related traits. Further screening study revealed that the male lines ID-5, ID-9
and PS 1070, female lines CMS 17A and CMS 335A and three of the hybrids CMS 17A x
ID-5, CMS 17A x ID-9 and CMS 335A x PS 1070 showed resistance to powdery mildew and
results obtained from F2 segregating generation of five crosses in the sunflower such as CMS
17A x ID-5, CMS 17A x ID-9, CMS 335A x IPS1070, CMS 7-1A x ID-5 and CMS 7-1A x
ID-5 revealed that powdery mildew disease resistance is controlled by polygenic inheritance.
As regards to heterosis and combining ability the results revealed that CMS 335A x
PS 1070, CMS 17A x ID-5 and CMS 17A x ID-9 exhibited higher heterosis over better
parent and males ID-5, ID-9 and PS 1070 and females CMS 17A and CMS 335A have been
the best general combiners for seed yield and its components.