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Identification of genes and genomic segments for cleistogamy in Pigeonpea(Cajanus cajan L.)

Yadav, P., Saxena, R.K., Kandalkar, V.S., Sameer Kumar, C.V. and Varshney, R.K.ORCID: 0000-0002-4562-9131 (2017) Identification of genes and genomic segments for cleistogamy in Pigeonpea(Cajanus cajan L.). In: InterDrought-V, 21 - 25 February 2017, Hyderabad, India.


Pigeonpea [Cajanus cajan (L.) Millsp.] is one of the major grain legume crops of the world predominantly grown in semi-arid tropics and sub-tropical regions. Pigeonpea has open or semi-cleistogamous flowers that promote natural out crossing. However, its open pollination behavior causes genetic deterioration in purity of seeds in varieties. In this direction introgression of cleistogamy or self-pollination behavior in pure line varieties can be a genetic tool to maintain purity of elite lines. In pigeonpea a mutant line ICPL 99050 has been identified as a cleistogamous line. However the cleistogamy has been found to link with shriveled seeds which further hampered the breeding efforts. Therefore, efforts have been initiated to identify the molecular markers/genes/genomic segments associated with cleistogamy and possibly to break its linkage with shriveled seeds. As the first step a recombinant inbred line (RIL) population has been developed from the crossing parents ICPL 99010 (cleisto flowers) and ICP 5529 (open flowers). RILs are being subjected to high density genotyping using 50k SNP array. In parallel RILs are being phenotyped for the cleistogamy and shriveled seeds. Trait phenotyping data together with SNP genotyping data will be used for the identification of genes and genomic segment associated with the target traits. Identified genes/genomic segments for cleistogamy/ shriveled seeds will help in selection of lines with self-pollinating behavior and acceptable seed size.

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