Heterosis as investigated in terms of polyploidy and genetic diversity using designed Brassica juncea amphiploid and its progenitor diploid species.

PloS One
Payal BansalS S Banga

Abstract

Fixed heterosis resulting from favorable interactions between the genes on their homoeologous genomes in an allopolyploid is considered analogous to classical heterosis accruing from interactions between homologous chromosomes in heterozygous plants of a diploid species. It has been hypothesized that fixed heterosis may be one of the causes of low classical heterosis in allopolyploids. We used Indian mustard (Brassica juncea, 2n = 36; AABB) as a model system to analyze this hypothesis due to ease of its resynthesis from its diploid progenitors, B. rapa (2n = 20; AA) and B. nigra (2n = 16; BB). Both forms of heterosis were investigated in terms of ploidy level, gene action and genetic diversity. To facilitate this, eleven B. juncea genotypes were resynthesized by hybridizing ten near inbred lines of B. rapa and nine of B. nigra. Three half diallel combinations involving resynthesized B. juncea (11×11) and the corresponding progenitor genotypes of B. rapa (10×10) and B. nigra (9×9) were evaluated. Genetic diversity was estimated based on DNA polymorphism generated by SSR primers. Heterosis and genetic diversity in parental diploid species appeared not to predict heterosis and genetic diversity at alloploid level. There was also n...Continue Reading

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Citations

Sep 6, 2013·Journal of Experimental Botany·A Gianinetti
Oct 21, 2016·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Mehak GuptaSurinder Singh Banga
Jun 9, 2016·Expert Opinion on Biological Therapy·Anna HagenhoffPeter J Nelson
Nov 17, 2014·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Mehak GuptaS S Banga

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