QTL for yield components and protein content: a multienvironment study of two pea (<Emphasis Type="Italic">Pisum sativum</Emphasis> L.) populations |
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| Authors: | P Krajewski J Bocianowski M Gaw?owska Z Kaczmarek T Pniewski W ?wi?cicki B Wolko |
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| Institution: | (1) Institute of Plant Genetics, Polish Academy of Sciences, Strzeszyńska 34, 60-479 Poznan, Poland;(2) Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, Wojska Polskiego 28, 60-637 Poznan, Poland |
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| Abstract: | Quantitative trait loci for yield, yield components and seed protein content were investigated on the basis of experiments
performed with two populations of pea (Pisum sativum L.) lines derived from linked crosses between lines Wt11238, Wt3557 and Wt10245 with contrasting characteristics. The yield-related
traits were defined as components giving the grain yield in a multiplicative way. The aim was to clarify the genetic architecture
of the relation between seed yield, its components and protein content, with a possible inclusion of the role of epistasis
in this explanation. To take full advantage of the availability of the two populations, additive QTL effects and both types
of epistasis were analysed: the QTL by genetic background interaction and the first-order QTL–QTL interaction. The two hybrid
populations differed with respect to the prevailing gene action, which in the Wt11238 × Wt3557 progeny was mainly additive,
while in the Wt10245 × Wt11238 progeny mainly epistatic. Some loci with previously reported, large, repeatable, but contradictory
effects on yield and protein content were confirmed. New loci with alleles coming from the protein-rich Wt11238 line, positive
for yield components, were identified. It was found that the first order QTL–QTL interaction events were more frequent for
the loci showing the QTL by genetic background interaction. |
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