Selection in Early Generations to Shift Allele Frequency for Seminal Root Angle in Wheat

The Plant Genome
Cecile RichardLee Hickey

Abstract

A current challenge for plant breeders is the limited ability to phenotype and select for root characteristics to enhance crop productivity. The development of a high-throughput phenotyping method has recently offered new opportunities for the selection of root characteristics in breeding programs. Here, we investigated prospects for phenotypic and molecular selection for seminal root angle (SRA), a key trait associated with mature root system architecture in wheat ( L.). We first investigated genetic diversity for this trait in a panel of 22 wheat lines adapted to Australian environments. The angle between the first pair of seminal roots ranged from 72 to 106°. We then evaluated selection gain via direct phenotypic selection in early generations by comparing the resulting shift in population distribution in tail populations selected for "narrow" and "wide" root angle. Overall, two rounds of selection significantly shifted the mean root angle as much as 10°. Furthermore, comparison of allele frequencies in the tail populations revealed genomic regions under selection, for which marker-assisted selection appeared to be successful. By combining efficient phenotyping and rapid generation advance, lines enriched with alleles for ei...Continue Reading

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Citations

May 23, 2018·Plant Methods·Samir AlahmadLee T Hickey
Jan 9, 2020·Journal of Experimental Botany·Anthony G Condon
Jun 19, 2019·Nature Biotechnology·Lee T HickeyBrande B H Wulff
Jul 16, 2020·Journal of Experimental Botany·Frederik J T van der BomMichael J Bell
Apr 27, 2019·Frontiers in Plant Science·Samir AlahmadLee T Hickey
Apr 27, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Eric S OberMichelle Watt

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