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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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Localization of lodging and stem stiffness loci on a Wt10245 x Wt11238 pea map (Pisum
sativum L.)
M Gawłowska 1 , W Święcicki 1 , M Knopkiewicz 1 , L Boros 2
1 Institute of Plant Genetics PAS, Poznań, Poland
2 Plant Breeding and Acclimatization Institute at Radzikow, Błonie, Poland
Lodging is one of the constraints of field pea production. It produces favourable conditions for
disease development, makes harvest difficult and increases harvest loss. The introduction of
some pea traits has decreased the risk of lodging, e.g. plant height reduction or an increase in the
pushing resistance of the lower part of the plant. A direct relationship exists between mechanical
properties of the plant stem (stem rigidity and maximum bending stress) and lodging. The aim of
the present study was an assessment of the mechanical properties of the plant stem in the
mapping population and their analysis as a quantitative trait. The assessment of the mechanical
properties of the plant stem could make lodging analysis easier and more reliable, provided the
correlation between these stem mechanical property data and lodging scores is confirmed. A total
of 104 RILs from the Wt10245 x Wt11238 mapping population were used in this analysis. Nine
new SSR markers coming from Loridon’s or Fondevilla’s maps were added to the map. The
QTLs were localized and characterized using the mixed-model-based composite interval mapping
method [QTL – Network 2.0]. Lodging data came from one season and mechanical property data
came from three seasons. Three QTLs were found for lodging resistance. Eleven QTLs were
found for mechanical traits for a bottom, middle and a top of pea stem in 2004, three QTLs in
2010 and seven QTLs in 2011. Some loci of stem rigidity and maximum bending stress
overlapped with each other. No QTL was common for both mechanical properties of the stem
and lodging resistance. The suggestion that QTLs for mechanical traits are common with lodging
loci was not confirmed.
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