Authors: Harjeevan Kaur S S Banga
Publish Date: 2014/11/15
Volume: 128, Issue: 2, Pages: 235-245
Abstract
Brassica juncea is naturally indeterminate This growth habit tends to accentuate intraplant 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 Ni4A10 at distances of 159 cM and 140 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 identifiedThis 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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