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The cultivated tetraploid southern highbush blueberry (SHB) is a result of interspecific hybridizations between northern highbush blueberry (NHB) and low-chill Vaccinium species native to the southern United States. Most of the old SHB

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Experiments were conducted with V. darrowi and two cultivars of southern highbush blueberry, `Sharpblue' and `Misty,' to test whether V. darrowi and cultivars derived from it are photoperiodic with respect to flower bud initiation. Plants of each cultivar were grown under three different photoperiod treatments [long days (LD) = 16-hour photoperiod; short days (SD) = 8-hour photoperiod; and short days + night interrupt (SD-NI) = 8-hour photoperiod with 1-hour night interrupt] at constant 21 °C for 8 weeks. Vegetative growth was greatest in the LD plants of both cultivars. Flower bud initiation occurred only in the SD treatments, and the lack of flower bud initiation in the SD-NI treatment indicates that flower bud initiation is a phytochrome mediated response in Vaccinium. Previously initiated flower buds on the V. darrowi plants developed and bloomed during the LD treatment, but bloom did not occur in the SD and SD-NI treatment plants until after those plants were moved to LD. These data indicate that flower bud initiation in both V. darrowi and southern highbush blueberry is photoperiodically sensitive, and is promoted by short days, while flower bud development is enhanced under long days.

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RAPD markers were used to determine the level of heterozygosity transmitted via 2n gametes from V. darrowi cv. Florida 4b (Fla 4B) to interspecific hybrids with tetraploid V. corymbosum cv. Bluecrop. The tetraploid hybrid US 75 was found to contain 70.6% of Fla 4B's heterozygosity, a value consistent with a first division restitution (FDR) mode of 2n gamete production. Crossovers during 2n gamete formation were evidenced by the absence of 16 dominant alleles of Fla 4B in US 75, and direct tests of segregation in a diploid population involving Fla 4B. RAPD markers that were present in both Fla 4B and US 75 were used to determine the mode of inheritance in a segregating population of US 75 × V. corymbosum cv. Bluetta. More than 30 homozygous pairs of alleles were located that segregated in a 5:1 ratio, indicating US 75 undergoes tetrasomic inheritance.

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morphology between diploid Vaccinium darrowii (left), interspecific ( V. darrowii × Vaccinium corymbosum ) hybrids (center), and tetraploid V. corymbosum (right). Leaves were taken from 2-year-old plants. Fig. 2. Comparative differences in

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Vaccinium species ( P < 0.0001). Least significant difference showed that V. pallidum accessions exhibited the most susceptible reaction to T. minima followed by their interspecific hybrids, V. corymbosum , V. tenellum , and V. elliottii

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removes H + from the rhizosphere ( Meharg and Blatt, 1995 ). Thus, the N form taken up by the plant can enhance or counteract H + -ATPase-mediated rhizosphere acidification. SHB ( Vaccinium corymbosum interspecific hybrids) is an economically important

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, V. arboreum , and their interspecific hybrids. Considering that roots of Vaccinium species are understudied with respect to RSA, and that V. arboreum is a promising source of RSA traits for SHB breeding, we set out to identify a rooting substrate

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closely related due to the antagonistic effect that these processes have on rhizosphere pH. This study investigated the rhizosphere acidification capacity of two taxa in the genus Vaccinium — V. corymbosum interspecific hybrid (SHB) and VA. We

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al., 1989 )], lowbush ( Vaccinium angustifolium ) and half-high blueberry ( V. corymbosum × V. angustifolium hybrids) ( Aalders and Hall, 1961 ; Harrison et al., 1994 ; Rabaey and Luby, 1988 ; Wood, 1968 ), and SHB ( Chavez and Lyrene, 2009

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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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