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<p><i>Jasminum sambac</i> cv. Ramanathapuram Gundumalli is a commercially important sterile triploid cultivar with limited scope for improvement through conventional breeding. The present study evaluated the effect of colchicine treatments at four concentrations (0.25, 0.50, 0.75, and 1.00%) along with a control on 15 vegetative and floral traits. Colchicine treatment increased phenotypic variability across most traits, particularly those related to plant architecture, floral attributes and flower yield. Estimates of genotypic and phenotypic coefficients of variation, broad-sense heritability and genetic advance indicated considerable heritable variation for several economically important traits. High heritability coupled with appreciable genetic advance was observed for plant height, number of flowering cymes, open flower diameter and flower yield, suggesting good prospects for selection. Principal component analysis explained 60.27% of the total variation and showed clear separation among treatments, reflecting concentration-dependent differences in trait expression. Among the treatments, 0.50% colchicine was most effective in generating favourable variability and trait associations. The findings indicate that colchicine treatment can broaden the genetic base of this cultivar and support the selection of superior clonal lines for jasmine improvement. Future investigations involving cytological and molecular approaches are required to verify chromosome alterations and validate the genetic basis of the observed variations.</p>

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Induction and assessment of genetic variability in Jasminum sambac cv. Ramanathapuram Gundumalli through colchicine treatment

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Vishnupandi S,
  • Ganga M,
  • Manonmani S,
  • Manikanda Boopathi N,
  • Swarnalatha P,
  • Prisca Seeli FD

摘要

Jasminum sambac cv. Ramanathapuram Gundumalli is a commercially important sterile triploid cultivar with limited scope for improvement through conventional breeding. The present study evaluated the effect of colchicine treatments at four concentrations (0.25, 0.50, 0.75, and 1.00%) along with a control on 15 vegetative and floral traits. Colchicine treatment increased phenotypic variability across most traits, particularly those related to plant architecture, floral attributes and flower yield. Estimates of genotypic and phenotypic coefficients of variation, broad-sense heritability and genetic advance indicated considerable heritable variation for several economically important traits. High heritability coupled with appreciable genetic advance was observed for plant height, number of flowering cymes, open flower diameter and flower yield, suggesting good prospects for selection. Principal component analysis explained 60.27% of the total variation and showed clear separation among treatments, reflecting concentration-dependent differences in trait expression. Among the treatments, 0.50% colchicine was most effective in generating favourable variability and trait associations. The findings indicate that colchicine treatment can broaden the genetic base of this cultivar and support the selection of superior clonal lines for jasmine improvement. Future investigations involving cytological and molecular approaches are required to verify chromosome alterations and validate the genetic basis of the observed variations.