Application of SSR markers for molecular characterization of hybrid parents and purity assessment of ICPH 2438 hybrid of pigeonpea [Cajanus cajan (L.) Millspaugh]

    Saxena, R K and Saxena, K B and Varshney, R K (2010) Application of SSR markers for molecular characterization of hybrid parents and purity assessment of ICPH 2438 hybrid of pigeonpea [Cajanus cajan (L.) Millspaugh]. Molecular Breeding, 26. pp. 371-380. ISSN 1572-9788

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    Abstract

    With an objective of achieving a breakthrough in the productivity of pigeonpea, a hybrid breeding technology based on elements of the cytoplasmic-nuclear male-sterility (CMS) system and partial natural out-crossing has recently been developed. However, there is no molecular diversity information available on parental lines of hybrids being generated at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT). This study deals with the use of 148 simple sequence repeat (SSR) markers, including 32 novel markers reported here for the first time, on 159 A (cytoplasmic male sterile), B (maintainer) and R (fertility restorer) lines. In total, 41 (27.7%) markers showed polymorphism with 2 to 6 (average 2.6) alleles and 0.01 to 0.81 (average 0.34) polymorphism information content (PIC) value. Of these polymorphic markers, 22 SSR markers showed polymorphism between A (ICPA 2039) and R (ICPR 2438) lines of the commercial hybrid (ICPH 2438); however, only 21 of these SSR markers showed the same profile between A (ICPA 2039) and B (ICPB 2039) lines. Finally, two SSR markers, CCB4 and CCttc006, were found most suitable for purity assessment of hybrid seeds of the ICPH 2438 hybrid. The utility of these two diagnostic SSR markers has been demonstrated by using seed lots of this hybrid from two sources, ICRISAT and Mahabeej. It is anticipated that molecular diversity information generated on parental lines of hybrids under development, and identification of the two most suitable markers for testing the purity of hybrid seeds of ICPH 2438, will facilitate the pigeonpea hybrid breeding programme.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Mandate crops > Pigeonpea
    Depositing User: Library ICRISAT
    Date Deposited: 17 Aug 2011 09:37
    Last Modified: 26 Aug 2013 05:16
    URI: http://oar.icrisat.org/id/eprint/255
    Official URL: http://dx.doi.org/10.1007/s11032-010-9459-4
    Projects: UNSPECIFIED
    Funders: Indian Council of Agricultural Research, Generation Challenge Programme
    Acknowledgement: The study was funded by the Pigeonpea Genomics Initiative of the Indian Council of Agricultural Research (ICAR) under the framework of Indo-US Agricultural Knowledge Initiative (AKI), Generation Challenge Programme (www.generationcp.org) and Tropical Legume II (TL II) of Bill and Melinda Gates Foundation (BMGF).
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