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Genetics of Brassica juncea

  • Akshay K. PradhanEmail author
  • Deepak Pental
Chapter
Part of the Plant Genetics and Genomics: Crops and Models book series (PGG, volume 9)

Abstract

Brassica juncea (AABB) is a natural allopolyploid of Brassica rapa (AA) and Brassica nigra (BB). B. juncea group contains both oilseed types and vegetable types. Extensive phenotypic and molecular marker-based studies on oilseed types of B. juncea have identified two major divergent gene pools, the Indian gene pool and the east European gene pool. Hybrids between the lines of these two gene pools are heterotic for yield, and such hybrids have now been commercialized in India. The two gene pools are significantly contrasting in major agronomic traits like seed size, pod size, pod number, height and oil content. A major future challenge in heterosis breeding is to transfer superior traits from one gene pool to the other while retaining the overall genetic divergence. This would allow further increases in yield. Recent work has provided reasonable number of markers for molecular tagging of both qualitative and quantitative traits and comparative mapping with model crucifer Arabidopsis and other Brassica species. Current work involves development of “00” canola-quality lines and their agronomic trials, disease resistance and QTL introgression. As the crop holds great promise for dryland agriculture in India and many other such areas around the globe, a concerted international effort is required on germplasm exchange, genetics, genomics and breeding of B. juncea.

Keywords

Mustard Molecular markers Gene tagging QTL Disease resistance 

Abbreviations

AFLP

Amplified fragment length polymorphism

CAPS

Cleaved amplified polymorhic sequence

cM

centi-Morgan

DH

Doubled haploid

FAE1

Fatty acid elongase 1

IP

Intron polymorphism

QTL

Quantitative trait loci

RAPD

Random amplification of polymorphic DNA

RFLP

Restriction fragment length polymorphism

RIL

Recombinant inbred line

RSB

Recurrent selection backcross

RuBisCO

Ribulose-1,5-bisphosphate carboxylase oxygenase

SCAR

Sequence characterized amplified region

var.

Variety

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© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of GeneticsCentre for Genetic Manipulation of Crop Plants, University of Delhi South CampusNew DelhiIndia

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