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Book of Abstracts First Legume Society Conference 2013: A Legume Odyssey Novi Sad, Serbia, 9-11 May 2013
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Quantitative trait loci for stem parameters in the field pea (Pisum sativum L.)
Michał Knopkiewicz, Magdalena Gawłowska, Wojciech Święcicki
Institute of Plant Genetics, Polish Academy of Sciences, Poznań, Poland
Lodging is one of the most limiting factors in attaining a stable and high yield of field pea. Our
previous research suggests that stem parameters (stem flexural rigidity- stiffness, maximum
bending stress- endurance, and diameter and stem wall thickness) are correlated with lodging
susceptibility. Stem parameters, lodging susceptibility and plant height were tested in a Carneval x
MP1401 RIL population. Three stem heights were analyzed: lower (2nd-4th internode), middle
(9th-10th internode) and upper (below the first generative node). Lodging was estimated in 3
periods (before flowering, after flowering and before harvesting) andon a 9-point scale (1-
susceptible, 9- not susceptible). Lodging was absent in the first two periods. In the third period
the average lodging value in the population was 7.1. The genetic map used for QTL mapping was
published by Tar’an et al. (2003) and rebuilt using JoinMap 2.0 software. It consists of 203 mainly
AFLP markers and 12 newly-found markers (7 STS, 4 SSR and 1 isozymic). QTL analysis was
performed with QTLNetwork 2.1 software. Data from two years were analyzed. Seven loci were
found: endurance (group I), stiffness (D) and stem diameter (VIc) for the bottom of the stem,
stem wall thickness (B) and stiffness (I) for the middle of the stem, stem thickness (IIIb) and
endurance (III) for the top of the stem. Loci for lodging and plant height were not found, but
lodging was negatively correlated with stem diameter and endurance in the middle of the stem
height.
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