Inheritance pattern and genetics of yield and component traits in opium poppy (Papaver somniferum L.)

Opium poppy (Papaver somniferum L) is an important medicinal plant produces more than 80 alkaloids belonging to various tetrahydrobenzylisoquinoline derived classes. These alkaloids are obtained from the capsules and straw of the plant Information on the nature and magnitude of gene effects are required for genetic improvement. Therefore, the continuous assessment of newer breeding materials is mandatory on part of breeders. The objective of this study was undertaken to understand the particular gene action involved in the inheritance of yield and component traits. Two families (VG26 x VG20 and SG35II x VE01) of opium poppy were analyzed to study the gene actions involved in the inheritance of yield and component traits (plant height, leaves per plant, capsules per plant, peduncle length, capsule index, seed and straw yield per plant and morphine content). Simple additive, dominance, and epistatic genetic components were found to be significant. Dominance effect ('h') was higher than additive effect ('d') for capsule index and morphine content. Digenic interaction indicated the prevalence of dominance x dominance ('l') followed by additive x dominance ('j') type epistasis. The opposite sign of dominance ('h') and dominance x dominance ('l') indicated duplicate epistasis for all the traits. Biparental mating followed by recurrent selection involving desired recombinants may be utilized to improve the component traits. (C) 2011 Elsevier B.V. All rights reserved.