Inheritance of grain mold resistance in grain sorghum without a pigmented testa

Citation
R. Rodriguez-herrera et al., Inheritance of grain mold resistance in grain sorghum without a pigmented testa, CROP SCI, 40(6), 2000, pp. 1573-1578
Citations number
39
Categorie Soggetti
Agriculture/Agronomy
Journal title
CROP SCIENCE
ISSN journal
0011183X → ACNP
Volume
40
Issue
6
Year of publication
2000
Pages
1573 - 1578
Database
ISI
SICI code
0011-183X(200011/12)40:6<1573:IOGMRI>2.0.ZU;2-M
Abstract
The improvement of grain mold resistance in sorghum [Sorghum bicolor (L.) M oench] 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 F-1, F-2, and back cross generations of a cross between 'Sureno' (a dual-purpose food grain an d forage variety, resistant to grain mold) and 'RTx430' (a widely adapted i nbred line, highly susceptible to grain mold) were evaluated in eight diffe rent held environments, Significant differences in grain mold incidence bet ween the generations evaluated in this study were observed in all environme nts. Combined analysis detected a significant generation five-environment i nteraction indicating that the genotypes reacted differently to each enviro nment. Generation means analysis of transformed grain mold scores detected additive effects in all eight environments, and dominance effects were dete cted in seven of eight environments, Epistatic effects were detected in onl y two of eight environments, but combined analysis indicated that higher or der interactions were important when evaluated across environment. Broad-se nse heritability estimates ranged from 0.46 to 0.82, while narrow-sense her itability estimates ranged from 0.39 to 0.59. At least four to 10 genes wer e estimated to contribute to grain mold resistance. The results of this stu dy indicate that selection in specific environments is useful for enhancing resistance to mold in these environments, but it may not be as effective i n providing grain mold resistance across a wide range of environments.