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Discovery and mapping of Brassica juncea Sdt 1 gene associated with determinate plant growth habit

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Newly discovered determinate plant growth habit in Brassica juncea is simply inherited and can help in architectural restructuring of Brassica oilseeds.

Abstract

Brassica juncea is naturally indeterminate. This growth habit tends to accentuate intra-plant competition for resources within the plant canopy, leading to unfilled seeds, immature pods and tip sterility. Recent identification of plants with determinate growth habit is expected to open up new avenues for plant architectural modifications in crop Brassicas. Plants with determinate plant growth habit were identified in progenies of resynthesized B. juncea as a de novo variation. F1 plants, developed from crosses of determinate mustard with natural indeterminate genotypes were indeterminate, indicating the dominance of indeterminacy. F2 and F3 segregation revealed monogenic recessive inheritance in the progenies studied. Gene for determinacy (Sdt 1 ) was mapped to the linkage group 15 of B. juncea. Sdt 1 was flanked by SSR markers SJ6842 and Ni4-A10 at distances of 15.9 cM and 14.0 cM, respectively. Determinate progenies showed significant variation for plant height, flowering time and productivity. There appeared to be no adverse association in terms of lower pod density, productivity or oil content. Determinacy was under control of single recessive gene, mapped to the linkage group 15 of B. juncea. Determinate progenies with high agronomic performance were identified.

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Acknowledgments

This work was supported by Indian Council of Agricultural Research under ICAR National Professor Project “Broadening the genetic base of Indian mustard (Brassica juncea) through alien introgressions and germplasm enhancement” awarded to S. S. B. Thanks are due to Dr. Shilpa Gupta, Nitin Kumar and Javed Akhtar for help in the conduct of the experiments and bioinformatics analysis.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana, India

    Harjeevan Kaur

  2. Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, India

    S. S. Banga

Authors
  1. Harjeevan Kaur
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  2. S. S. Banga
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Correspondence to S. S. Banga.

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Communicated by Heiko C. Becker.

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Kaur, H., Banga, S.S. Discovery and mapping of Brassica juncea Sdt 1 gene associated with determinate plant growth habit. Theor Appl Genet 128, 235–245 (2015). https://doi.org/10.1007/s00122-014-2424-6

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  • DOI: https://doi.org/10.1007/s00122-014-2424-6

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