Abstract
Lentil quantitative trait loci (QTL) related to plant structure (branches at first node, height of first node, total number of branches, plant height), growth habit (flowering time, pod dehiscence) and yield (number of seeds, seed weight, seed diameter) were located using a F2 population of 113 individuals derived from the intersubspecific cross of Lens culinaris ssp. culinaris and L. c. ssp. orientalis. Several traits were found to be significantly correlated. Using interval and composite interval mapping a total of 23 QTL for nine quantitative traits were located. No QTL was identified for the number of F3 seed produced. Six QTL were positioned respectively in linkage groups III and VI, and five QTL in linkage group I. Each remaining group included one or two QTL, except groups VII and IX where no QTL was found. The multiple QTL model explained more than 80% of the observed phenotypic variance with logarithm of the odds (LOD) scores above 10 for three of the quantitative traits analyzed (branches at first node, flowering time, and dehiscence). For the remaining traits the phenotypic variance explained was relatively low, between the 50% and 20%, and the LOD scores ranged between 4 and 8. The possible homology between some QTL and other previously described is discussed in relation to their chromosomal location.
Highlights
Lentil (Lens culinaris Medik.) is a self-pollinated diploid (2n = 14) legume with a relatively large genome of 4,063 Mbp (Arumuganathan and Earle, 1991)
Lentil seeds are valued as a food source of both highquality plant proteins and fiber, in addition, the remaining plant residues can be used as animal feed and fodder
The relatively reduced genetic variation and an insufficient amount of genetic information have until recently conditioned lentil genetic maps to include a relatively small number of markers, mainly isozymes and restriction fragment length polymorphisms (RFLPs) which covered an relatively small portion of the lentil genome (Havey and Muehlbauer, 1989; Muehlbauer et al, 1989; Tahir et al, 1993)
Summary
Lentil (Lens culinaris Medik.) is a self-pollinated diploid (2n = 14) legume with a relatively large genome of 4,063 Mbp (Arumuganathan and Earle, 1991). This ancient pulse crop was most probably domesticated in the Fertile Crescent from Lens culinaris ssp. Biochemical and molecular markers have revealed that lentil has relatively low levels of genetic variation in comparison to other plant species (Alvarez et al, 1997; Eujayl et al, 1997; Ford et al, 1997; Ferguson, 1998; Sonante and Pignone, 2001; Durán and Pérez de la Vega, 2004). In order to maximize polymorphism for map construction in lentil, intersubspecific hybrid populations have sometimes been used (Havey and Muehlbauer, 1989; Eujayl et al, 1997; Durán et al, 2004)
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