A linkage mapping approach was used to identify quantitative trait loci (QTL) associated with day-neutrality in the commercial strawberry, Fragaria · ananassa (Duch ex Rozier). Amplified Fragment Length Polymorphism (AFLP) markers were used to build a genetic map with a population of 127 lines developed by crossing the dayneutral (DN) ÔTributeÕ with the short-day (SD) ÔHoneoyeÕ. The population was genotyped with AFLP markers and 429 single dose restriction fragments (SDRF) were placed on a consensus map of 1541 cM with 43 linkage groups. Individuals from the mapping population were observed for their flowering habit throughout the growing season in Michigan (MI), Minnesota (MN), Maryland (MD), Oregon (OR) and California (CA). Eight QTL were found that were either location specific or shared among locations. None of these QTL explained >36% of the phenotypic variation, indicating that the inheritance of day-neutrality is likely a polygenic trait.Two primary types of commercial strawberries are grown, short-day (SD) and day-neutral (DN). SD genotypes or Junebearers, initiate flower buds either under SD conditions (<14 h of day length) or at temperatures below 15°C, while DN genotypes are photoperiod insensitive and will initiate flowers under any photoperiod conditions as long as temperatures are moderate (Darrow 1966, Hancock 1999. Dayneutrality was most recently introduced into modern cultivars by Bringhurst and Voth (1984), using a native genotype of F. virginiana (Mill) ssp. glauca (S. Watson) Staudt from the Wasatch Mountains of Utah.To date, the genetics of day-neutrality in strawberries have remained elusive. Several different models have been proposed including: (i) regulation by a single dominant gene Voth 1978, Ahmadi et al. 1990); (ii) regulation by dominant complementary genes (Ourecky and Slate 1967); and (iii) quantitative inheritance (Powers 1954, Hancock et al. 2001). The reason why these studies generated different hypotheses may be that they utilized different sets of parents and were conducted in different environments. The study of Ourecky and Slate (1967) was conducted in New York using material that had not recently had any new F. virginiana germplasm incorporated. The studies of Powers (1954) and Hancock et al. (2001), were performed in Wyoming and Michigan, respectively, using DN parents that carried genes from F. · ananassa and wild clones of F. virginiana that were different from the Wasatch source. The studies of Bringhurst and Voth (1978) and Ahmadi et al. (1990) were performed in CA using University of California-Davis breeding parents carrying the Wasatch source of day-neutrality. There was one study in CA that suggested day-neutrality may have a quantitative basis (Shaw 2003), but it was later refuted by a more extensive statistical analysis of a greater number of progeny populations (Shaw and Famula 2005). Sugimoto et al. (2005) found a RAPD-marker linked to a dominant gene regulating day-neutrality in a Japanese breeding population carrying the Wasatch source of day-neutrality.To e...
No abstract
Three areas of small fruit research that have received major attention during the past 10 years are molecular biology, germplasm resources and health benefits, and the results of those efforts will be discussed in more detail.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.