Genetic variation and character association for grain yield and component traits in traditional rice (Oryza sativa L.) cultivars of Assam

DOI: 10.37992/2023.1401.021

  • Kangkana Thakur,
  • M. K. Sarma,
  • Sofia Banu,
  • Daizi Durba Saharia,
  • Ishanee Borgohain and,
  • Sobha Dutta Deka

Abstract

An experiment was conducted with a view to obtain information of genetic parameters of variation and character association for 13 quantitative traits in a set of 64 rice cultivars of Assam. The study revealed significant differences for all the traits under study. Highest genotypic coefficient of variation was observed for the trait biological yield followed by harvest index and grain yield. More than 80% heritability was observed for all the traits except grain yield, effective tillers per plant and biological yield. Genetic advance as per cent of mean was highest for biological yield followed by harvest index, filled grains per panicle and grain yield. Higher magnitude of genetic advance along with considerably high heritability observed for harvest index, filled grains per panicle and biological yield indicated that these traits could be considered for selection to obtain high genetic gain. Character association studies indicated that direct selection of 100 - grain weight, grain length, grain breadth, biological yield and harvest index, would bring about improvement in grain yield. Non-significant association of grain yield with important yield attributes viz., filled grain per panicle, tillers per plant and panicle length were due to their strong association with duration of genotypes, which in turn was negatively associated with grain yield.  Recombination breeding and recurrent selection, therefore, could be suggested to break the negative linkage in order to achieve further genetic improvement.

Keywords: Character association, genetic improvement, genetic variability, rice

Published
31-03-2023
How to Cite
Kangkana Thakur, M. K. Sarma, Sofia Banu, Daizi Durba Saharia, Ishanee Borgohain and, Sobha Dutta Deka

Genetic variation and character association for grain yield and component traits in traditional rice Oryza sativa L. cultivars of Assam

. 2023. Electronic Journal of Plant Breeding, 14 1, 349-353. Retrieved from https://ejplantbreeding.org/index.php/EJPB/article/view/4500
Issue
Vol 14 No 1 (2023): EJPB
Section
Research Note

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