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GENOMICS, MOLECULAR GENETICS & BIOTECHNOLOGY

Selection for Lodging Resistance in Early Generations of Field Pea by Molecular Markers

Chunzhen Zhang^a,*,, Bunyamin Tar'an^b,, Tom Warkentin'^b, Abebe Tullu^b, Kirstin E. Bett^b, Bert Vandenberg^b and Daryl J. Somers^c

^a Department of Horticulture, Room 259, Horticulture Hall, Iowa State University, Ames, IA 50011
^b Crop Development Centre/Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada, S7N 5A8
^c Agriculture and Agri-Food Canada, Cereal Research Centre, 195 Dafoe Rd., Winnipeg, MB, Canada, R3T 2M9

^* Corresponding author (chz405{at}iastate.edu)

Lodging resistance is a key objective in pea breeding programs. Implementation of marker-assisted selection (MAS) in early generations could significantly enhance the efficiency of the breeding process compared with conventional selection in the F₃ or later generations. The objective of this research was to evaluate the effectiveness of MAS for lodging resistance using a combination of a coupling-phase linked marker A001 and a repulsion-phase linked marker A004 in F₂ generation field pea (Pisum sativum L.). Eight F₂ populations consisting of 680 plants were scored for the markers. A total of 402 F₃ families derived from MAS and 187 F₃ families from unselected populations were evaluated for lodging reaction under field conditions. The lowest lodging scores for each population were obtained from plants with the combination of A001 marker presence and A004 marker absence. A higher proportion of lodging resistant F₃ families was obtained from this marker combination as compared with phenotypic selection in the F₃ generation. MAS was less expensive than phenotypic selection in the field. Thus, A001 and A004 are useful for MAS for lodging resistance in early generation pea breeding populations.