Genetic analysis and molecular mapping of a new fertility restorer gene Rf8 for Triticum timopheevi cytoplasm in wheat (Triticum aestivum L.) using SSR markers

    Sinha, P and Tomar, S M S and Vinod, . and Singh, V K and Balyan , H S (2013) Genetic analysis and molecular mapping of a new fertility restorer gene Rf8 for Triticum timopheevi cytoplasm in wheat (Triticum aestivum L.) using SSR markers. Genetica. pp. 1-11. ISSN 1573-6857

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    Abstract

    A study on mode of inheritance and mapping of fertility restorer (Rf) gene(s) using simple sequence repeat (SSR) markers was conducted in a cross of male sterile line 2041A having Triticum timopheevi cytoplasm and a restorer line PWR4099 of common wheat (Triticum aestivum L.). The F1 hybrid was completely fertile indicating that fertility restoration is a dominant trait. Based on the pollen fertility and seed set of bagged spikes in F2 generation, the individual plants were classified into fertile and sterile groups. Out of 120 F2 plants, 97 were fertile and 23 sterile (based on pollen fertility) while 98 plants set ≥5 seeds/spike and 22 produced ≤4 or no seed. The observed frequency fits well into Mendelian ratio of 3 fertile: 1 sterile with χ2 value of 2.84 for pollen fertility and 2.17 for seed setting indicating that the fertility restoration is governed by a single dominant gene in PWR4099. The three linked SSR markers, Xwmc503, Xgwm296 and Xwmc112 located on the chromosome 2DS were placed at a distance of 3.3, 5.8 and 6.7 cM, respectively, from the Rf gene. Since, no known Rf gene is located on the chromosome arm 2DS, the Rf gene in PWR4099 is a new gene and proposed as Rf8. The closest SSR marker, Xwmc503, linked to the Rf8 was validated in a set of Rf, maintainer and cytoplasmic male sterile lines. The closely linked SSR marker Xwmc503 may be used in marker-assisted backcross breeding facilitating the transfer of fertility restoration gene Rf8 into elite backgrounds with ease.

    Item Type: Article
    Divisions: UNSPECIFIED
    CRP: UNSPECIFIED
    Subjects: Others > Genetics and Genomics
    Others > Agriculture-Farming, Production, Technology, Economics
    Depositing User: Mr Sanat Kumar Behera
    Date Deposited: 19 Oct 2013 06:24
    Last Modified: 07 Nov 2013 04:49
    URI: http://oar.icrisat.org/id/eprint/7180
    Official URL: http://dx.doi.org/10.1007/s10709-013-9742-5
    Projects: UNSPECIFIED
    Funders: Council of Scientific and Industrial Research(India)
    Acknowledgement: Financial support provided by the Council of Scientific and Industrial Research (CSIR), New Delhi, India in the form of Emeritus Scientist scheme to SMST is gratefully acknowledged. The study is part of the Ph.D. research of the first author. The authors are also grateful to the Director, Indian Agricultural Research Institute, New Delhi for providing
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