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Abstract
Percent fruit set, fruit size, total seeds/berry, developed seeds/berry, percent developed seeds/berry, and percent pollen stainability were examined in 4x × 5x and 5x × 4x progenies derived from Vaccinium ashei Reade/V. corymbosum L. pentaploid hybrids backcrossed to V. corymbosum. All fertility parameters indicated that the BC1 progenies were more fertile than the pentaploid hybrids. Pollen stainability indicated that the BC1 derivatives were less fertile than the parental species. All fertility parameters were significantly and negatively correlated with chromosome number, which ranged from the tetraploid (2n = 4x = 48) to pentaploid (2n = 5x = 60) levels within these progenies.
Abstract
V. corymbosum L./V. ashei Reade pentaploid blueberry hybrids backcrossed to tetraploid V. corymbosum yield tetraploids and aneuploids. Six BC1 derivatives, a tetraploid (2n = 4x = 48) and five multiple aneuploids (2n = 4x + 3, 4, 5, 8, and 9 = 51, 52, 53, 56, and 57) were selfed, intercrossed, and backcrossed to the V. corymbosum cv. Bluecrop. The fertility parameters measured were percent fruit set (FS), total seeds/berry (TS), developed seeds/berry (DS), percent developed seeds/berry (PDS), percent seed germination (PG), and number of seedlings (NS). Values of all parameters decreased as aneuploidy level of the cross (sum of extra chromosomes, number of chromosomes over 2n = 48, in the seed and pollen parent) increased; the relationship was principally linear. A significant quadratic relationship was noted for PDS. Diallel analysis revealed that reciprocal effects were significant for all parameters except PG and were the second most important factor contributing to variability among crosses for NS. All parameters indicated a high level of self sterility. Although the aneuploids in this study had reduced crossability, they can produce sizable progenies with practical efficiency. Contrary to previous reports, these results suggest that pentaploid hybrids and their BC1 derivatives can be used to facilitate gene transfer from V. ashei into V. corymbosum.
Abstract
‘Bounty’ is a stem blight-tolerant and cane canker-resistant early-midseason to midseason cultivar of highbush blueberry (Vaccinium corymbosum L.) ripening at about the same time as ‘Murphy’. It has been a consistent producer of very large fruit, with above-average flavor and excellent color, stem scar, and firmness. ‘Bounty’ flavor does not deteriorate rapidly, as is typical with standard highbush blueberries in eastern North Carolina. The name reflects the abundant crops of very large high-quality fruit produced by this cultivar. Released cooperatively by the North Carolina Agricultural Research Service and the USDA. ‘Bounty’ is intended for fancy fresh fruit production in areas subject to cane canker [Botryosphaeria corticis (Demaree & Wilcox) Arx and Muller] and stem blight [Botryosphaeria dothidea (Mouq. ex Fr.) Ces. & de Not.].