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Combining ability, genetic diversity and heterosis in relation to F1 performance of tropically adapted shrunken (sh2) sweet corn lines

Solomon, K. F. and Zeppa, A. and Mulugeta, S. D. (2012) Combining ability, genetic diversity and heterosis in relation to F1 performance of tropically adapted shrunken (sh2) sweet corn lines. Plant Breeding, 131 (3). pp. 430-436. ISSN 0179-9541

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Article Link(s): http://dx.doi.org/10.1111/j.1439-0523.2012.01965.x

Publisher URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0523.2012.01965.x/full

Abstract

With 6 tables Abstract The objectives of this study were to evaluate the importance of heterosis for agronomic and quality traits in shrunken (sh2) sweet corn, assess the usefulness of combining ability to predict the value of parents and their crosses for further genetic improvement and examine whether genetic divergence can predict heterosis or F1 performance. Ten genetically diverse shrunken (sh2) sweet corn inbred lines were used to generate 45 F1s. F1s and parents were evaluated for agronomic and quality traits across environments. Heterosis was more important for yield-related traits than it was for ear aspects and eating quality. Heterosis for most traits was mostly dependent on dominance genetic effects of parental lines. Parents and F1per se performance were highly correlated with general combining ability effects and mid-parent values, respectively, for most traits. Hybrid performance for flavour and plant height was significantly but weakly related to simple sequence repeat (SSR)-based genetic distance (GD). Phenotypic distance (PD), estimated from phenotypic traits was correlated with heterosis for total soluble solids, ear length and flavour. © 2012 State of Queensland.

Item Type:Article
Business groups:Crop and Food Science
Additional Information:Plant Breed.
Keywords:Combining ability; heterosis; simple sequence repeats; sweet corn; maize inbred lines; hybrid performance; molecular markers; Eberhart analyses; cultivars; populations; diallel; yield; environment; patterns.
Subjects:Plant culture > Field crops > Corn. Maize
Science > Botany > Genetics
Deposited On:04 Feb 2014 03:20
Last Modified:04 Feb 2014 03:20

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