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C. L. Gupton, J. M. Spiers, and A. D. Draper

Eight clones with various Vaccinium species in their background were evaluated to determine their potential for improving fruit characteristics in the southern highbush blueberry. One clone was crossed with each of the others to produce seven sets of progenies which were evaluated with the parent clones. Heritability estimates were computed as the regression of progeny on parental means for each character. The progenies ranged from small to average berry size and weight, were above average for picking scar, and were generally less than average for color, firmness, and flavor. Mean of progenies was not significantly different from the parental mean for any character. Very high (0.45-0.85) heritability estimates were found for each character except berry firmness (0.22). These results suggest that considerable improvement in each character except possibly berry firmness should result from phenotypic recurrent selection in a broad based population involving these parents.

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Gad G. Yousef, Mary A. Lila, Ivette Guzman, James R. Ballington, and Allan F. Brown

; Gustafson et al., 2012 ; Kalt et al., 2001 ; Prior et al., 1998 ; Reyes-Carmona et al., 2005 ; Scalzo et al., 2013 ). Currently, no public or private breeding program (that we are aware of) is selecting for new blueberry cultivars primarily on the basis

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Mark K. Ehlenfeldt and Chad E. Finn

these plant materials. The Univ. of Florida patented and released a pink-fruited rabbiteye ( V. ashei Reade) cultivar in 2004 (‘Florida Rose’; Lyrene, 2004 ), and the U.S. Department of Agriculture blueberry breeding program has received several

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Anish Malladi, Tripti Vashisth, and Scott NeSmith

considerable research efforts underway to enhance the efficiency of this process. In fact, a current area of focus of several blueberry breeding programs is the development of genotypes better suited for mechanical harvesting ( NeSmith, 2009 ; Jim Olmstead

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James W. Olmstead, Hilda Patricia Rodríguez Armenta, and Paul M. Lyrene

; Ehlenfeldt and Martin, 2002 ). Many of the firmer selections were recent breeding releases, indicating that progress in developing firmer highbush blueberry cultivars has been made ( Ehlenfeldt, 2005 ). A concentrated ripening period may ultimately prove to

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Dario J. Chavez and Paul M. Lyrene

blueberry ( Vaccinium angustifolium Aiton), highbush blueberry ( Vaccinium corymbosum and their hybrids), and rabbiteye blueberry ( Vaccinium virgatum Aiton). Since the establishment of blueberry breeding programs, genes from various wild blueberry

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Qin Yang, Er Liu, Yan Fu, Fuqiang Yuan, Tingting Zhang, and Shu Peng

temperature stress. In addition, the cardinal temperatures can inform breeding strategies for blueberry tolerance to heat stress, which is of great significance for breeding heat-tolerant germplasms. Materials and Methods Plant material. The experiments were

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Lisa Klima Johnson, Anish Malladi, and D. Scott NeSmith

). Large fruit size is an important trait for selection during the development of new varieties in blueberry breeding programs ( NeSmith, 2009 ). Although considerable variation in fruit size is observed among rabbiteye blueberry genotypes, the basis of

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Mark K. Ehlenfeldt, James J. Polashock, Allan W. Stretch, and Matthew Kramer

Breeding and selection for plant disease resistance remains one of the most economically and environmentally sound approaches to improving crop quality and yield ( Lynch et al., 2003 ). As part of a long-term breeding program in blueberries, we

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Douglas A. Phillips, Philip F. Harmon, James W. Olmstead, Natalia A. Peres, and Patricio R. Munoz

used as a parent in the University of Florida blueberry breeding program in the past, raising concerns regarding potential susceptibility of offspring from these crosses. In addition, there is a concern about whether other commercial cultivars may be