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Quantitative inheritance and correlations of agronomic and grain quality traits of sorghum sorghum bicolor



Quantitative inheritance and correlations of agronomic and grain quality traits of sorghum sorghum bicolor



Crop Science 25(4): 649-654



Two S2 or S1-derived families from each of 118 So plants from Purdue random-mated population (PP18) of S. bicolor (L.) Moench, were evaluated in a randomized complete-block design over 1 or 2 yr. Genetic parameters were estimated for days to bloom, plant height, lodging, panicle compactness, panicle weight, kernel weight, weathering, hardness and vitreosity to assess breeding potential of the population. Additive variances were estimated using a weighted least-squares procedure. Additive variances were significant for all traits. The additive genetic coefficients of variation ranged from 2.9% for days to bloom to 25.5% for lodging. Narrow-sense heritabilities ranged from 0.349 to 0.734 for S0-derived family selection (unit equals mean of S2 progeny of two S1/S0 plants in two replications in either 1 or 2 years). Heritabilities ranged from 0.359 to 0.842 for S1-derived family selection (unit equals mean of S2 progeny of a single S1/S0 plant in 2 replications in either 1 or 2 years). Additive genetic (-0.737 to 0.839) and phenotypic (-0.649 to 0.710) correlations were high among agronomic traits and among quality traits, and low between agronomic and quality traits. Kernel hardness had strong correlations with weathering (negative) and vitreosity (positive). Direct selection responses (percentage of mean) ranged from 3.70 to 28.58% and from 5.10 to 37.10% for S0- and S1-derived family selection, respectively. Correlated responses were lower than direct responses for most traits. However, for some pairs of traits the difference between the 2 responses was not large. The results suggested good potential for conventional breeding methods and early generation selection for all traits tested. More improvement would be expected from S1-derived than from S0-derived family selection.

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