An intra-specific consensus genetic map of pigeonpea Cajanus cajan L. Millspaugh derived from six mapping populationsReport as inadecuate




An intra-specific consensus genetic map of pigeonpea Cajanus cajan L. Millspaugh derived from six mapping populations - Download this document for free, or read online. Document in PDF available to download.

Theoretical and Applied Genetics

, Volume 125, Issue 6, pp 1325–1338

First Online: 08 July 2012Received: 03 January 2012Accepted: 05 June 2012

Abstract

Pigeonpea Cajanus cajan L. is an important food legume crop of rainfed agriculture. Owing to exposure of the crop to a number of biotic and abiotic stresses, the crop productivity has remained stagnant for almost last five decades at ca. 750 kg-ha. The availability of a cytoplasmic male sterility CMS system has facilitated the development and release of hybrids which are expected to enhance the productivity of pigeonpea. Recent advances in genomics and molecular breeding such as marker-assisted selection MAS offer the possibility to accelerate hybrid breeding. Molecular markers and genetic maps are pre-requisites for deploying MAS in breeding. However, in the case of pigeonpea, only one inter- and two intra-specific genetic maps are available so far. Here, four new intra-specific genetic maps comprising 59–140 simple sequence repeat SSR loci with map lengths ranging from 586.9 to 881.6 cM have been constructed. Using these four genetic maps together with two recently published intra-specific genetic maps, a consensus map was constructed, comprising of 339 SSR loci spanning a distance of 1,059 cM. Furthermore, quantitative trait loci QTL analysis for fertility restoration Rf conducted in three mapping populations identified four major QTLs explaining phenotypic variances up to 24 %. To the best of our knowledge, this is the first report on construction of a consensus genetic map in pigeonpea and on the identification of QTLs for fertility restoration. The developed consensus genetic map should serve as a reference for developing new genetic maps as well as correlating with the physical map in pigeonpea to be developed in near future. The availability of more informative markers in the bins harbouring QTLs for sterility mosaic disease SMD and Rf will facilitate the selection of the most suitable markers for genetic analysis and molecular breeding applications in pigeonpea.

Communicated by A. Schulman.

Electronic supplementary materialThe online version of this article doi:10.1007-s00122-012-1916-5 contains supplementary material, which is available to authorized users.

Download fulltext PDF



Author: Abhishek Bohra - Rachit K. Saxena - B. N. Gnanesh - Kulbhushan Saxena - M. Byregowda - Abhishek Rathore - P. B. KaviKish

Source: https://link.springer.com/







Related documents