Patterns in genetic variation and character association of yield components in turmeric (curcuma longa L.)
Genetic variation & character association in turmeric
Keywords:Correlation, genetic variability, hertitability, path analysis
Understanding genetic variability patterns of turmeric yield traits is essential to develop new genotypes with improved traits. The objective of the present study was to investigate the genetic variability, heritability, genetic advance and association of various yield components in turmeric genotypes. The experiment was conducted for two seasons during 2021-22 and 2022-23 using 21 turmeric genotypes at ICAR-IISR, Experimental farm, Peruvannamuzhi, Kerala. The results indicate that the genotypes exhibited significant variation across two seasons for most traits, with the exception of collar girth, weight of primary rhizomes per clump, and number of primary rhizomes per clump, which suggests the presence of genetic variability in the genotypes. Maximum fresh rhizome yield per clump was recorded in the genotype, IISR Pragati. The Genotypic Coefficient of Variation (GCV) was found to be moderate to high for most of the traits except plant height, leaf lamina length, collar girth and fresh rhizome yield per plant, whereas, Phenotypic Coefficient of Variation (PCV) was found to be moderate to high for all the traits except plant height. Heritability was observed moderate to high for all the traits except collar girth, number of primaries per clump, weight of primaries rhizomes per clump and fresh rhizome yield per plant. The petiole length, total leaf area, weight of mother rhizomes per clump and number of mother rhizomes per clump showed high heritability along with genetic advance. Correlation analysis suggested that weight of mother rhizomes per clump had a strong positive association with plant height, number of leaves, leaf lamina length, leaf lamina width, leaf area, total leaf area, and collar girth and had a weak positive relationship with fresh rhizome yield per plant and petiole length. The path analysis revealed, total leaf area, fresh rhizome yield per plant and number of primaries per clump have high direct positive effects with weight of mother rhizomes per clump. The high heritability and genetic advance observed for above mentioned traits suggest that exercising a simple selection could indirectly improve the low heritable low genetic advance traits such as fresh rhizome yield per plant as indicated by correlation and path analysis.
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