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Hävard Eikemo, May B. Brurberg, and Jahn Davik

The genus Fragaria in the rose family (Rosaceae) is well known for their edible fruits, and the economically important octoploid Fragaria × ananassa Dutch. produces large red strawberries and is grown all over the world. In 2007, the world

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Chad E. Finn, Jorge B. Retamales, Gustavo A. Lobos, and James F. Hancock

HISTORY The cultivated strawberry ( Fragaria × ananassa Duch. ex Rozier) originated from an accidental cross of the white-fruited Chilean strawberry [ F. chiloensis (L.) Mill. subsp. chiloensis f. chiloensis ] and the meadow strawberry ( F

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Douglas V. Shaw, Frank G. Zalom, and Kirk D. Larson

Eighteen strawberry genotypes from the University of California's breeding population were evaluated over two years for yield and fruit size with complete, partial, and no control of natural infestation by Tetranychus urticae Koch. The numbers of mites per leaf accumulated for the entire season or counted at peak infestation, and the number of mite-days accumulated for the season for partial control treatments were 31.7% to 44.0% of corresponding values realized for uncontrolled infestation, and values differed significantly between treatments for all three variables. Yields for the no-control and partial-control treatments averaged 81.6% and 85.0% of the yields obtained with complete spidermite suppression for the 2 trial years; fruit sizes were 95.1% and 92.0% for corresponding comparisons. Yield and fruit size differed significantly between the complete-control treatment and any level of infestation, but statistically significant differences between partial and complete mite control treatments were detected only for fruit size in a single year. Analysis of variance demonstrated significant or highly significant variation due to control level, genotype, and their interactions for both yield and fruit size, but resolution of variance components demonstrated that genetic × treatment interactions explained just 0% to 8% of the phenotypic variance for yield and fruit size in a 2-year evaluation. Genotypic variances, those reflecting genetic effects that were stable across treatments, were at least 9.3 times as large as interaction variances for these traits. There appears to be no evidence for partial resistance that might be expressed at intermediate levels of spidermite infestation.

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Rebecca M. Harbut, J. Alan Sullivan, John T.A. Proctor, and Harry J. Swartz

The cultivated strawberry was originally derived from the accidental hybridization of two wild, octoploid species, Fragaria chiloensis and Fragaria virginiana ( Darrow, 1966 ). The resulting octoploid hybrid, Fragaria × ananassa , is the basis

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Douglas D. Archbold

Plants of a diverse collection of Fragaria clones from a range of native habitats representing F. chiloensis, F. virginiana, F. virginiana glauca, and F. vesca, were grown in a controlled environment at one of three day/night temperatures, 15/15, 23/15, or 31/15°C. Relative growth rate (RGR) and net assimilation rate (NAR) were estimated from plant leaf areas and total dry weights. At 23/15°C, the species mean RGR and NAR values were comparable although clones within species exhibited significant variation. At 15/15 and 31/15°C, RGR and NAR for species were lower than at 23/15°C. At 31/15°C, chiloensis and vesca mean values were reduced more than the others, to less than 50% the 23/15°C values. Also, NAR declined most for chiloensis, to 45% the 23/15°C value. At 15/15°C, virginiana had much higher RGR and NAR values than the other species, and its NAR mean value was greater than at 23/15°C. Although the species means would suggest that there are interspecific differences in temperature response, intraspecific variability was also large. Thus, classifying Fragaria species by temperature response may be an over-generalization.

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James F. Hancock, Chad E. Finn, James J. Luby, Adam Dale, Pete W. Callow, and Sedat Serçe

The founding genetic base of the commercial strawberry, Fragaria × ananassa Duchesne in Lamarck, is limited. It originated ≈250 years ago when a few clones of South American F. chiloensis chiloensis (L.) Miller subsp. chiloensis forma

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Basilio Carrasco, Marcelo Garcés, Pamela Rojas, Guillermo Saud, Raúl Herrera, Jorge B. Retamales, and Peter D.S. Caligari

staining solution). Table 1. Characteristics of six intersimple sequence repeat primers used for the analysis of Fragaria chiloensis accessions. Intersimple sequence repeat data analysis. From the ISSR patterns, each band was denoted

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Travis L. Stegmeir, Chad E. Finn, Ryan M. Warner, and James F. Hancock

The primary cultivated strawberry, Fragaria × ananassa Duchesne ex Rozier, is believed to have arisen from a chance hybridization between the octoploid species F. chiloensis (L.) Miller subsp. chiloensis forma chiloensis and F

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Alan Chambers, Pamela Moon, Yuqing Fu, Juliette Choiseul, Jinhe Bai, Anne Plotto, and Elizabeth Baldwin

octoploid, Fragaria × ananassa strawberries, from December to March ( MacKenzie et al., 2011 ). Cultivars specifically bred for this location have demonstrated high yield, disease resistance, and fruit quality ( Whitaker et al., 2011 ). In contrast

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Masanori Honjo, Sono Kataoka, Susumu Yui, Masami Morishita, Miyuki Kunihisa, Takayoshi Yano, Megumi Hamano, and Hiromichi Yamazaki

. The cultivated strawberry, Fragaria × ananassa Duch., is one of the most economically important fruit crops in the world. It first arose from accidental hybridization between two American octoploid species, F . virginiana and F . chiloensis