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Ebrahiem M. Babiker, Stephen J. Stringer, Barbara J. Smith, and Hamidou F. Sakhanokho

on the characterization and incorporation of genes for resistance. The native diploid Vaccinium species are important sources of adaptive traits. Southern highbush blueberry cultivars possess genes introduced from several Vaccinium species

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Patricio A. Brevis, Nahla V. Bassil, James R. Ballington, and James F. Hancock

hybridization reached its height during the development of “southernhighbush blueberry cultivars, which began in 1948 at the University of Florida ( Sharpe, 1953 ). Southern highbush blueberries (SHB) are low-chill (less than 600 h below 7 °C) interspecific

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Kang Hee Cho, Seo Jun Park, Su Jin Kim, Se Hee Kim, Han Chan Lee, Mi Young Kim, and Jae An Chun

are further separated into northern and southern types depending on their chilling requirements and winterhardiness. Southern highbush blueberries are better adapted than northern highbush blueberries to warmer climates ( Boches et al., 2006

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Tripti Vashisth, D. Scott NeSmith, and Anish Malladi

different genotypes are not clearly understood. The southern highbush blueberry cultivar, Suziblue, was evaluated previously as TH-730 and commercially released as an early-season cultivar with favorable fruit characteristics ( NeSmith, 2010 ). TH-729 is an

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Mary Helen Ferguson, Christopher A. Clark, and Barbara J. Smith

and Florida have confirmed X. fastidiosa as the cause of a leaf scorch disease of southern highbush blueberries ( Vaccinium corymbosum interspecific hybrids) ( Chang et al., 2009 ; Harmon and Hopkins, 2009 ). Inoculation of rabbiteye blueberry ( V

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Patrick H. Kingston, Carolyn F. Scagel, David R. Bryla, and Bernadine C. Strik

, including one northern highbush and one southern highbush blueberry. Both types of blueberry are commonly used for substrate production. Materials and Methods Experimental setup. Two cultivars, ‘Liberty’ northern highbush blueberry and ‘Jewel’ southern

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Changying Li, Pengcheng Yu, Fumiomi Takeda, and Gerard Krewer

processed using a customized computer program. Fig. 3. An illustration of how the Smart Berry sensor, a miniature instrumented sphere, was attached to the southern highbush blueberry plant during the field tests. The impact data collected by the sensor

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Rogério Ritzinger and Paul M. Lyrene

Several morphological features of Vaccinium ashei Reade, V. constablaei A. Gray, their F1 hybrids, V. simulatum Small, and southern highbush blueberry (V. corymbosum L. hybrids) flowers were compared in Gainesville, Fla. Desirable characteristics that could increase the extent of honeybee pollination, such as a large corolla aperture and a short anther-to-stigma distance, were common in V. constablaei but not in V. ashei. F1 (V. ashei × V. constablaei) hybrids were generally intermediate between the two parents. Thus, it appears that V. constablaei could be used to breed V. ashei cultivars with improved flower morphology. Vaccinium simulatum and V. constablaei flowers were similar in all features. The corollas of southern highbush blueberry flowers were wide and had wide apertures, but the distance between stigma and anther pore was also large.

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Creighton Gupton, John Clark, David Creech, Arlie Powell, and Susan Rooks

To determine if any of the available techniques for estimating stability in different environments are useful in blueberry (Vaccinium ashei Reade and V. corymbosum L.), 14 clones were evaluated in nine environments for ripening date and yield. Type 1 and 2 stability statistics, plots for each genotype mean versus its coefficient of variation (cv) across environments (genotype grouping), environmental index regression, and cluster analyses were compared. The highest yielding rabbiteye and southern highbush clones across locations were not deemed stable by Type 1 and Type 2 stability statistics, genotype grouping, or environmental regression technique. No evidence of curvilinear response was found. The nonparametric cluster analysis with known cultivars included appears to be most useful compared to other methods of estimating stability used in this study.

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Rebecca L. Darnell and Steven A. Hiss

Most Vaccinium species have narrow soil adaptation and are limited to soils that have low pH, high available iron (Fe), and nitrogen (N) primarily in the ammonium (NH4+) form. Vaccinium arboreum Marsh. is a wild species that can tolerate a wider range of soil conditions, including higher pH and nitrate (NO3-) as the predominant N form. This wider soil adaptation may be related to the ability of V. arboreum to acquire Fe and NO3- more efficiently than cultivated Vaccinium species, such as V. corymbosum L. interspecific hybrid (southern highbush). Nitrate and Fe uptake, and nitrate reductase (NR) and ferric chelate reductase (FCR) activities were compared in these two species grown hydroponically in either 1.0 or 5.0 mm NO3-. Nitrate uptake rate (on a whole-plant and FW basis) and root NR activity were significantly greater in V. arboreum compared with V. corymbosum. Iron uptake on a FW basis was also greater in V. arboreum, and was correlated with higher root FCR activity than was found in V. corymbosum. Increased Fe and NO3- uptake/assimilation in V. arboreum were reflected in increased organ and whole-plant dry weights compared with V. corymbosum. Vaccinium arboreum appears to be more efficient in acquiring and assimilating NO3- and Fe than is the cultivated species, V. corymbosum. This may partially explain the wider soil adaptation of V. arboreum.