Analysis of skewness and kurtosis in F2 generation of four crosses in American cotton (Gossypium hirsutum L.)
DOI:
https://doi.org/10.31783/ELSR.2024.1025257Keywords:
kurtosis, mean performance, skewness, upland cottonAbstract
The current study was conducted to assess the mean, range, skewness, and kurtosis of four crosses in the F2 generation of upland cotton. The study consists of eight parents hybridized in a diallel method to obtain fifty-six hybrids. From these hybrids, four elite hybrids were forwarded to the F2 generation based on high boll weight, high yield of cotton per plant and high fiber quality. Based on the mean performance in the F2 population, Cross I (CO 14 x IC 359538) documented a high mean value for the locules number per boll and uniformity index. Cross II (GISV 328 x IC 359538) recorded the highest mean value for the number of monopodial branches per plant, boll number per plant, yield of cotton per plant and lint index. Cross III (IC 292130 x GISV 328) recorded a high mean for plant height, number of sympodial branches per plant, seed index and fiber fineness. Cross IV (MCU 5 x IC 359464) registered a high mean value for boll weight, number of seeds per boll, upper half mean length, fiber strength, elongation percentage and ginning outturn. All four crosses showed positive skewness for monopodial branches per plant, sympodial branches per plant, boll number per plant, locules number per boll, yield of cotton per plant, seed index, fiber strength and elongation percentage. Positive skewness is associated with complementary gene interactions, while negative skewness is associated with duplicate gene interactions. The platykurtic curve was observed for sympodial branches per plant, boll weight, seed index, fiber fineness and ginning outturn in all four crosses, whereas the leptokurtic peak was noted for yield of cotton per plant and boll number per plant in all four crosses.
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