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Identifying genetic components controlling fertility in the outcrossing grass species perennial ryegrass (Lolium perenne) by quantitative trait loci analysis and comparative genetics

Armstead, I. P.; Turner, L. B.; Marshall, A. H.; Humphreys, M. O.; King, I. P.; Thorogood, D.

Authors

I. P. Armstead

L. B. Turner

A. H. Marshall

M. O. Humphreys

D. Thorogood



Contributors

Abstract

Mutational load and resource allocation factors and their effects on limiting seed set were investigated in ryegrass by comparative mapping genomics and quantitative trait loci (QTL) analysis in two perennial ryegrass (Lolium perenne) mapping families sharing common genetic markers. Quantitative trait loci for seed-set were identified on chromosome (LG) 7 in both families and on LG4 of the F2/WSC family. On LG7, seed-set and heading date QTLs colocalized in both families and cannot be unequivocally resolved. Comparative genomics suggests that the LG7 region is syntenous to a region of rice LG6 which contains both fertility (S5(n)) and heading date (Hd1, Hd3a) candidate genes. The LG4 region is syntenous to a region of rice LG3 which contains a fertility (S33) candidate gene. QTL maxima for seed-set and heading date on LG4 in the F2/WSC family are separated by c. 8 cm, indicating distinct genetic control. Low seed set is under the control of recessive genes at both LG4 and LG7 locations. The identification of QTLs associated with seed set, a major component of seed yield in perennial ryegrass, indicates that mutational load associated with these genomic regions can be mitigated through marker-assisted selection.

Citation

Armstead, I. P., Turner, L. B., Marshall, A. H., Humphreys, M. O., King, I. P., & Thorogood, D. (2008). Identifying genetic components controlling fertility in the outcrossing grass species perennial ryegrass (Lolium perenne) by quantitative trait loci analysis and comparative genetics. New Phytologist, 178(3), 559-571. doi:10.1111/j.1469-8137.2008.02413.x

Journal Article Type Article
Acceptance Date Jan 8, 2008
Online Publication Date Mar 11, 2008
Publication Date 2008-05
Deposit Date Dec 6, 2018
Journal New Phytologist
Print ISSN 0028-646X
Electronic ISSN 1469-8137
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 178
Issue 3
Pages 559-571
DOI https://doi.org/10.1111/j.1469-8137.2008.02413.x
Public URL https://nottingham-repository.worktribe.com/output/1373519
Publisher URL https://nph.onlinelibrary.wiley.com/doi/full/10.1111/j.1469-8137.2008.02413.x