Diversity in bread and durum wheat stigma morphology and linkage of increased stigma length to dwarfing gene Rht14

Margaret Pallotta; Takashi Okada; Stuart Roy; Allison Pearson; Ute Baumann; Ryan Whitford

doi:10.1007/s00122-024-04663-4

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Diversity in bread and durum wheat stigma morphology and linkage of increased stigma length to dwarfing gene Rht14

Journal article

Open access

Peer reviewed

Diversity in bread and durum wheat stigma morphology and linkage of increased stigma length to dwarfing gene Rht14

Margaret Pallotta, Takashi Okada, Stuart Roy, Allison Pearson, Ute Baumann and Ryan Whitford

Theoretical and applied genetics, Vol.137(7), 160

2024

DOI: https://doi.org/10.1007/s00122-024-04663-4

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Abstract

Agriculture

Biochemistry

Biomedical and Life Sciences

Biotechnology

General

Life Sciences

Original Article

Plant Biochemistry

Plant Breeding/Biotechnology

Plant Genetics and Genomics

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 Adelaide
Takashi Okada - The University of Adelaide
Stuart Roy - The University of Adelaide
Allison Pearson - The University of Adelaide
Ute Baumann - The University of Adelaide
Ryan 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
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