Grain yield potential strategies in an elite wheat double - haploid population grown in contrasting environments
The understanding of ecophysiological basis of wheat [Triticum aestivum L.] grain yield potential provides a useful framework to complement conventional breeding aimed at achieving genetic gains. This study analyzed the ecophysiological performance of an elite wheat mapping population [105 double-haploid lines derived from two modern cultivars, Bacanora and Weebil, with similar phenology but different and stable combinations of grain number per area unit [GN] and grain weight [GW] resulting in high grain yield] grown in four contrasting high-yielding environments, to determine the most successful strategies to increase grain yield potential. Main effect of environment on grain yield was significant [p less than 0.0001] but the genotypic component was larger than genotype x environment interaction [30 percent]. A robust and positive relationship between grain yield and biomass production was observed across all environments [r2 greather than 0.82, p less than 0.0001], and relatively high harvest indexes were expressed [0.39-0.51]. While GN was clearly the dominant numerical component in terms of association with grain yield [r2 greather than 0.51, p less than 0.0001], a wide range in both components [i.e., GN and GW] was observed across all environments. This population represents a valuable resource for prebreeding studies, as the transgressive segregation in physiological and numerical yield components in combination with favorable expression of all agronomic traits could allow a fine phenotyping and mapping to identify key traits and quantitative trait loci linked with grain yield.
| Main Authors: | , , , , , |
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | GRAIN, WHEAT, ENVIRONMENTAL, HAPLOID, , |
| Online Access: | http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46894 |
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| Summary: | The understanding of ecophysiological basis of wheat [Triticum aestivum L.] grain yield potential provides a useful framework to complement conventional breeding aimed at achieving genetic gains. This study analyzed the ecophysiological performance of an elite wheat mapping population [105 double-haploid lines derived from two modern cultivars, Bacanora and Weebil, with similar phenology but different and stable combinations of grain number per area unit [GN] and grain weight [GW] resulting in high grain yield] grown in four contrasting high-yielding environments, to determine the most successful strategies to increase grain yield potential. Main effect of environment on grain yield was significant [p less than 0.0001] but the genotypic component was larger than genotype x environment interaction [30 percent]. A robust and positive relationship between grain yield and biomass production was observed across all environments [r2 greather than 0.82, p less than 0.0001], and relatively high harvest indexes were expressed [0.39-0.51]. While GN was clearly the dominant numerical component in terms of association with grain yield [r2 greather than 0.51, p less than 0.0001], a wide range in both components [i.e., GN and GW] was observed across all environments. This population represents a valuable resource for prebreeding studies, as the transgressive segregation in physiological and numerical yield components in combination with favorable expression of all agronomic traits could allow a fine phenotyping and mapping to identify key traits and quantitative trait loci linked with grain yield. |
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