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A yellow-leaf seedling marker, r, was used to determine if there was preferential chromosome pairing in a group of tetraploid southern highbush blueberry hybrids. Plants with four copies of r (no copies of R) fail to develop anthocyanins, and cotyledons, hypocotyls, leaves, stems, and other vegetative tissues have a bright yellow-green color. In the hybrids that were studied, two genomes were from the diploid wild species, V. elliottii Chapman, and both carried the recessive marker r. The other two genomes were from southern highbush cultivars and both carried the dominant wildtype allele, R. When RRrr hybrids were intercrossed or crossed to rrrr yellow-leaf plants, the number of yellowleaf rrrr seedlings obtained usually equalled or exceeded the number predicted from nonpreferential chromosome pairing. Since rr gametes can only be produced by RRrr plants when R and r chromosomes pair at Meiosis I, there was no evidence that the chromosomes derived from V. elliottii were pairing at a higher-than-random rate.
Abstract
‘Flordaglo’ peach [Prunus persica (L.) Batsch] is an attractive, high-quality, white-flesh peach released by the Florida Agricultural Experiment Station (Fig. 1). ‘Flordaglo’ is expected to replace the white-flesh ‘Flordared’ peach because it bears more attractive, firmer, and larger fruit. ‘Flordaglo’ is expected to be successful in home gardens and it should have commercial potential in areas where white-flesh peaches are acceptable in markets.
Abstract
‘Flordastar’ peach [Prunus persica (L.) Batsch] is released for grower trial by the Florida Agricultural Experiment Station (Fig. 1). This cultivar bears attractive, yellow-fleshed fruit that ripen before ‘Flordaprince’ in central Florida.
Abstract
‘Flordacres’ peach [Prunus persica (L.) Batsch] is released for grower trial by the Florida Agricultural Experiment Station (Fig. 1). It bears attractive fruit with yellow flesh and ripens after ‘Flordaking’ and before ‘June Gold’ in northern Florida.
Abstract
Florida's early season, fresh market rabbiteye blueberry (Vaccinium ashei Reade) industry has been based mainly on the cultivars Beckyblue, Climax, Aliceblue, and Premier. Both ‘Aliceblue’ and ‘Premier’ have given problems with poor fruit set after mild winters, particularly in areas south and east of Gainesville (1); thus, there is a need for additional early ripening cultivars to interplant with ‘Beckyblue’ and ‘Climax’. ‘Bonita’ is being released for this purpose by the Institute of Food and Agricultural Science from the Univ. of Florida blueberry breeding program.
Abstract
Three diploid taxons (Vaccinium darrowi Camp, V. elliottii Chapm., and interspecific V. darrowi x V. elliottii) were treated with various colchicine concentrations and treatment durations to determine the best method for inducing autopolyploidy in in vitro blueberry cultures. Shoot-tip cuttings were the best in vitro planting material for induction of shoots with increased diameter, an indicator of polyploidy. Tetraploids were produced at colchicine concentrations from 0% to 0.20%. The best treatment combinations were genotype-dependent.
Abstract
Guard cells tended to be shortest for diploid species and longest for hexaploids, but there was so much plant-to-plant variation both within ploidy levels (diploid, tetraploid, hexaploid) and within species that guard cell length was not a reliable indicator of ploidy level of individual plants.
Abstract
‘Sunripe’ nectarine (Prunus persica (L.) Batsch) has been released to provide a medium large, high quality freestone nectarine with a low chilling requirement.