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Journal article
Diversity in bread and durum wheat stigma morphology and linkage of increased stigma length to dwarfing gene Rht14
Theoretical and applied genetics, Vol.137(7), 160
2024
Abstract
Although much understudied in wheat, the stigma is a crucial component for attaining grain set, the fundamental basis for yield, particularly in hybrid production systems where successful grain set relies on wind-driven pollen dispersal by the male parent and effective pollen capture by the female parent. Females with long stigma that exsert early are thought to be advantageous. Using glasshouse-grown lines, we examined variation in Total Stigma Length (TSL) across diverse panels comprising 27 durum and 116 bread wheat genotypes. Contrasting genotypes were selected for population development and genetic analysis. Quantitative trait loci (QTL) analysis was performed on a durum F2 population and a bread wheat recombinant inbred line (RIL) population. Contrasting with studies of anther length, we found no large effect on TSL of the GA-insensitive semi-dwarfing genes Rht-B1 and Rht-D1 in either durum or bread wheat. However, in durum cultivar Italo, we identified a region on chromosome 6A which is robustly associated with larger TSL and contains the Rht14 allele for reduced plant height, a trait that is favourable for female line development in hybrid systems. This dual effect locus explained 25.2 and 19.2% of TSL phenotypic variation in experiments across two growing seasons, with preliminary results suggesting this locus may increase TSL when transferred to bread wheat. In a bread wheat, RIL population minor QTL on 1A and 2A was indicated, but the strongest association was with Ppd-B1. Methods developed here, and the identification of a TSL-enhancing locus provides advances and further opportunities in the study of wheat stigma.
Details
- Title
- Diversity in bread and durum wheat stigma morphology and linkage of increased stigma length to dwarfing gene Rht14
- Authors/Creators
- Margaret Pallotta - School of Agriculture, Food and Wine, University of AdelaideTakashi Okada - The University of AdelaideStuart Roy - The University of AdelaideAllison Pearson - The University of AdelaideUte Baumann - The University of AdelaideRyan Whitford - Murdoch University, Centre for Crop and Food Innovation
- Publication Details
- Theoretical and applied genetics, Vol.137(7), 160
- Publisher
- Springer Berlin Heidelberg
- Grant note
- UA317; UA418 / South Australian Grain Industry Trust Fund (http://dx.doi.org/10.13039/100012180) The University of Adelaide Yitpi Foundation (http://dx.doi.org/10.13039/501100022944)
- Identifiers
- 991005679070307891
- Copyright
- © The Author(s) 2024
- Murdoch Affiliation
- Centre for Crop and Food Innovation; State Agricultural Biotechnology Centre
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.4 Crop Science
- 3.4.96 QTL
- Web Of Science research areas
- Agronomy
- Genetics & Heredity
- Horticulture
- Plant Sciences
- ESI research areas
- Agricultural Sciences