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CROP BREEDING, GENETICS & CYTOLOGY

Inheritance of Grain Mold Resistance in Grain Sorghum without a Pigmented Testa

^a Dep. of Soil & Crop Science, Texas A&M Univ., College Station, TX 77843-2474 USA
^b Texas Agric. Exp. Stn., Route 3, Box 219, Lubbock, TX 79401-9757 USA
^c Dep. of Plant Pathology & Microbiology, Texas A&M Univ., College Station, TX 77843-2132 USA

wlr{at}tamu.edu

The improvement of grain mold resistance in sorghum [Sorghum bicolor (L.) Moench] has been difficult, presumably because of the complex inheritance of the trait. The objective of this study was to determine the inheritance of grain mold resistance by generation means analysis. The F₁, F₂, and backcross generations of a cross between `Sureño' (a dual-purpose food grain and forage variety, resistant to grain mold) and `RTx430' (a widely adapted inbred line, highly susceptible to grain mold) were evaluated in eight different field environments. Significant differences in grain mold incidence between the generations evaluated in this study were observed in all environments. Combined analysis detected a significant generation five-environment interaction indicating that the genotypes reacted differently to each environment. Generation means analysis of transformed grain mold scores detected additive effects in all eight environments, and dominance effects were detected in seven of eight environments. Epistatic effects were detected in only two of eight environments, but combined analysis indicated that higher order interactions were important when evaluated across environment. Broad-sense heritability estimates ranged from 0.46 to 0.82, while narrow-sense heritability estimates ranged from 0.39 to 0.59. At least four to 10 genes were estimated to contribute to grain mold resistance. The results of this study indicate that selection in specific environments is useful for enhancing resistance to mold in these environments, but it may not be as effective in providing grain mold resistance across a wide range of environments.

Abbreviations: BE, Beeville • CC, Corpus Christi • CW, College Station with sprinkler irrigation • CD, College Station without sprinkler irrigation

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