Genetic variability, correlation and path analysis in desi cotton (g. arboreum l.)
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Date
2017-08-22
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Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
The present studies on “Genetic Variability, Correlation and Path Analysis In Desi Cotton (G. arboreum L.)” involved the assessment of genetic variability, heritability, GCV and PCV, genetic advance, their associations and path effects. The experimental material consisted of 39 different elite genotypes of desi cotton along with three checks viz., AKA-7, PA-08 and JLA-794.
A wide range of variation was found for almost all the characters. The phenotypic coefficient of variation (PCV) which measures the total variation was found to be greater than genotypic coefficient of variation (GCV). In the experiment all the characters showed very small difference between GCV and respective PCV, indicated that all the characters were least affected by environment. High heritability estimates coupled with high expected genetic advance were observed for the characters plant height, number of sympodia per plant, number of bolls per plant, lint index, harvest index, upper half mean length and seed cotton yield per plant indicating the presence of additive gene action and phenotypic selection may be more fruitful and effective for desired genetic improvement.
The lines FDK-260 (51.93 g), GAM-231 (50.22 g), PBD-17 (49.86 g), PAIG-363 (49.00 g) and KWA-1301 (48.70 g) showed higher seed cotton yield per plant over all three checks viz., AKA-7 (37.74 g), PA-08 (44.09 g) and JLA-794 (48.00 g).
The genotypes PAIG-363, DWda-1502, GAM-231 and ARBa-1502 showed superiority for fiber quality traits.
The correlation studies revealed significant and positive genotypic and phenotypic correlation of number of bolls per plant, number of sympodia per plant, lint index, boll weight, plant height, ginning percent, seed index and harvest index with seed cotton yield per plant indicate the importance of these characters for improving seed cotton yield per plant.
The path analysis studies revealed that, the traits viz., number of bolls per plant, boll weight, plant height, number of sympodia per plant, harvest index, days to 50 percent flowering, lint index, uniformity ratio and micronnaire exerted direct positive effect on seed cotton yield. Therefore, these characters should be given due emphasis for making selection for high yielding genotypes in desi cotton.
Traits viz., number of sympodia per plant, number of bolls per plant, plant height, boll weight, ginning percent, lint index, seed index, micronnaire and uniformity ratio were the most important characters for effective selection of superior genotypes of desi cotton as they expressed high heritability and significant positive correlation as well as direct effect on seed cotton yield.
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