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W.A. Erb, A.D. Draper, and H.J. Swartz

Progenies and clones of interspecific hybrid blueberries were evaluated for annual fraction of canopy volume (FCYV) and for difference in fraction of canopy volume between control and stressed plants [FCYV(C) - FCYV(S)] in a moderate water-deficit environment. The FCYV(C) - FCYV(S) data were used to determine combining ability effects. In addition, physiological processes of attached leaves of the clones were monitored with a portable photosynthesis apparatus. Specific combining ability (SCA) effects were significant for FCYV(C) - FCYV(S). The clone with the lowest mean for FCYV(C) - FCYV(S) was US75, a hybrid of Vaccinium darrowi Camp × V. corymbosum L. Clone JU64 (V. myrsinites Lamark × V. angustifolium Aiton) also had a low FCYV(C) - FCYV(S) mean, and its two progenies (JU64 × JU11 and G362 × JU64) had low progeny means. Stomatal conductance was lowered when blueberries were exposed to atmospheric and/or soil moisture stress that resulted in lower transpiration and photosynthesis and increased or equal water-use efficiencies (WUE). Blueberry plants adjusted to moisture stress as the season progressed by lowering stomatal conductance and increasing WUE. In particular, stressed plants of US75 and JU64 had equal or higher WUE values than control plants. US226 was the most drought-susceptible clone in the study, and its stomata did not appear to be as responsive to moisture stress as the other clones. Breeding for higher WUE in a dry environment appears possible with the germplasm used in this study.

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W.A. Erb, A.D. Draper, G.J. Galletta, and H.J. Swartz

Data from a four-parent diallel, involving one highbush (Vaccinium corymbosum L.) clone and three interspecific hybrids grown on mineral soil unamended with organic matter, were analyzed to determine combining ability effects for six traits: plant size, berry size, the number of days between flowering and fruiting (# DBF&F), the ratio of total fruit weight to canopy volume (TFW: CYV), days to fruit ripe, and yield. General combining ability effects were significant for all characters tested, except yield and berry size in 1984. Specific combining ability effects were significant for plant size in 1983, #DBF&F in 1984, TFW: CYV in 1984, and berry size in 1985. Vigorous and productive highbush cultivars can be developed for mineral soils by using the interspecific clones from this study and their selected recombinant to combine the genes for plant vigor with the high-quality fruit traits of highbush cultivars.

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

. angustifolium , V. elliottii , V . myrsinites , V. pallidum , V. tenellum , V. fuscatum , V. constablaei , and V. arboreum , in addition to the genetic contributions from V. corymbosum , V. darrowii , and V. virgatum that are also found in the

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Paul M. Lyrene

frequently burned pinelands throughout the state of Florida. It belongs to section Cyanococcus , and fertile hybrids with highbush cultivars can easily be produced in large numbers. The crosses between V. myrsinites and tetraploid V. stamineum were

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Dario J. Chavez and Paul M. Lyrene

.5% and 62.2%, respectively. Berries formed after pollinating V. darrowii flowers with V. elliottii pollen ripened earlier than those produced by self-pollination of V. darrowii . However, V. myrsinites (4x) produced two-thirds less fruit set when

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Elliot H. Norden, Paul M. Lyrene, and Jose X. Chaparro

Vaccinium HortScience 2 52 57 Lyrene, P.M. Sherman, W.B. 1980 Horticultural characteristics of native Vaccinium darrowi, V. elliottii, V. fuscatum , and V. myrsinites in Alachua county, Florida J. Amer. Soc. Hort. Sci. 105 393 396 Lyrene, P.M. Sherman, W

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

, including V. darrowii Camp, V. angustifolium Ait., V. virgatum Ait., V. elliottii Chapm., V. tenellum Ait., V. pallidum Ait., V. myrsinites Lam., and V. stamineum Lam. ( Brevis et al., 2008 ; Ehlenfeldt et al., 1995 ; Hancock et al., 1995

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Blair J. Sampson, Stephen J. Stringer, and Donna A. Marshall

8301; 5) V. myrsinites Lam. clone NC8406a; 6) V. tenellum Aiton clones NC7808, NC8309, NC8709, NJ8831, NJ8833, NJ8835, and NC7976a; and 7) Southern highbush blueberry ( V. corymbosum × V. darrowii ) cultivars Biloxi, Pearl River, Cooper, Gulfcoast

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Hirotoshi Tsuda, Hisato Kunitake, Mai Yamasaki, Haruki Komatsu, and Katsunori Yoshioka

tetraploid V. corymbosum . Furthermore, the crosses of colchicine-induced tetraploid V. arboreum with tetraploid highbush blueberry cultivars and with tetraploid V. myrsinites (section Cyanococcus ) produced vigorous and fertile tetraploid hybrids

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

cultivated SHB. Blueberry breeders from public agencies have also hybridized highbush blueberry with three additional species, V. myrsinites Lamarck, V. pallidum Ait., and V. simulatum Small, which may eventually be incorporated into the genetic