Full TGIF Record # 315128
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Web URL(s):https://scisoc.confex.com/scisoc/2020am/meetingapp.cgi/Paper/127177
    Last checked: 03/25/2021
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Ortiz, Joan Barreto; Watkins, Eric; Ehlke, Nancy Jo
Author Affiliation:Ortiz and Watkins: Horticultural Science, University of Minnesota, St. Paul, MN; Ehlke: Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN
Title:Association between inflorescence morphology and seed shattering in perennial ryegrass (Lolium perenne L.)
Section:Turf physiology, molecular biology, and genetics poster (includes student presentation)
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C05 Turfgrass Science
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Source:ASA, CSSA and SSSA International Annual Meetings. November 9-13 2020, p. [1].
# of Pages:1
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
Abstract/Contents:"Seed shattering is a main cause of yield reduction in perennial ryegrass (Lolium perenne L.) seed production. Seed detachment is due to partial or complete formation of fissures in the abscission zones. Seed yield, which is negatively associated with shattering, is genetically determined by the spike architecture of grasses. This architecture comprises a combination of features, many of which are pleiotropically controlled and potentially associated with shattering. Understanding the genetics of inflorescence morphology may facilitate marker-based breeding for seed retention and yield. However, conventional phenotyping challenges this goal as it relies on visual phenotyping which is subjective, time-consuming and low-throughput. In this preliminary study, we induced mechanical shattering on 13 diverse accessions and measured it as the percentage from the spike that detached. Images of the spikes were processed with a custom imaging system that quantifies colors, dimensions and branching features; the spike architecture was defined by the principal components (PC) of those traits. Using principal component regression, PC1, PC2, and PC3 had the highest correlations with shattering (0.56, -0.39, 0.25, respectively; p < 0.05) and explained 76% of the variation. Using stepwise regression, we found a significant increase in the coefficient of determination (R2) from 0.54 to 0.67 when including accession as a predictor, suggesting that genetic variation for spike morphology could be unveiled using such a system. These results support the hypothesis that a linear combination of inflorescence traits are associated with seed shattering, and the trait could be phenotyped in a high-throughput manner using spike morphology as a proxy. Further work is necessary to stringently validate trait values from the imaging system with visual phenotyping. Nonetheless, achievable improvements in the phenotyping method would make it a valuable tool for genetic studies and marker-based breeding aimed to improve seed retention in perennial ryegrass."
Note:Pictures, color
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
2020. Association between inflorescence morphology and seed shattering in perennial ryegrass (Lolium perenne L.). Agron. Abr. p. [1].
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    Last checked: 03/25/2021
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