Narrowing down a major QTL region reveals Phytochrome E (PHYE) as the candidate gene controlling flowering time in mungbean (Vigna radiata)

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  • Amkul Kitiya
    Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Kamphaeng Saen Campus
  • Laosatit Kularb
    Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Kamphaeng Saen Campus
  • Lin Yun
    Institute of Crop Sciences, Jiangsu Academy of Agricultural Sciences
  • Yimram Tarika
    Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Kamphaeng Saen Campus
  • Chen Jingbin
    Institute of Crop Sciences, Jiangsu Academy of Agricultural Sciences
  • Yuan Xingxing
    Institute of Crop Sciences, Jiangsu Academy of Agricultural Sciences
  • Chen Xin
    Institute of Crop Sciences, Jiangsu Academy of Agricultural Sciences
  • Somta Prakit
    Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Kamphaeng Saen Campus

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  • Narrowing down a major QTL region reveals <i>Phytochrome E</i> (<i>PHYE</i>) as the candidate gene controlling flowering time in mungbean (<i>Vigna radiata</i>)

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<p>Flowering time is an important agronomic trait that is highly correlated with plant height, maturity time and yield in mungbean. Up to present, however, molecular basis of flowering time in mungbean is poorly understood. Previous studies demonstrated that flowering time in mungbean is largely controlled by a major QTL on linkage group 2 (LG2). In this study, the QTL on the LG2 in mungbean was investigated using F2 and F2:3 populations derived from a cross between mungbean cultivar Kamphaeng Saen 2 (KPS2) and wild mungbean accession ACC41. The QTL was narrowed down to a genome region of 164.87 Kb containing a phytochrome gene, designated VrPHYE, encoding phytochrome E (phyE), a known photoreceptor modulating flowering time. Compared to VrPHYE of the wild ACC41, VrPHYE of KPS2 contained several single nucleotide polymorphisms (SNPs) causing amino acid changes. Those SNPs were also found in other mungbean cultivars. Some amino acid changes were predicted to occur in the regulatory region of phytochromes. Gene expression analysis revealed that VrPHYE in KPS2 was expressed significantly higher than that in ACC41. These results showed that VrPHYE is the candidate gene controlling flowering time in the mungbean.</p>

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