and Johnson-Cicalese, 2012 ). Traditional cranberry breeding ( V. macrocarpon Ait., 2 n = 2 x = 24) is a long process, taking 10 to 30 years from the original cross to cultivar release. This process often results in the improvement of only a few
R. Karina Gallardo, Parichat Klingthong, Qi Zhang, James Polashock, Amaya Atucha, Juan Zalapa, Cesar Rodriguez-Saona, Nicholi Vorsa and Massimo Iorizzo
Jennifer Johnson-Cicalese, James J. Polashock, Josh A. Honig, Jennifer Vaiciunas, Daniel L. Ward and Nicholi Vorsa
resistance ( Byrne, 2012 ), including the Rutgers/NJAES cranberry breeding program. Current cultivars are high-yielding and widely adapted, but lack sufficient fruit rot resistance (FRR). Fruit rot resistance would be especially valuable for the northeastern
Rodney Serres and Brent McCown
The capability to uniformlyinduce flowering in cranberry (Vaccinium macrocarpon Ait. `Stevens') in < 1 year from microculture was investigated to accelerate cranberry breeding and to study woody plant reproductive biotechnology. Flower buds were induced on newly micropropagated cranberry plants during the first growing season. A treatment of 2.5 mg of paclobutrazol applied as a soil drench per 2- to 3-month-old potted plant in midsummer, when the plants were grown in coldframes under natural daylength and air temperatures, resulted in 70% of the plants flowering. Plants not treated with paclobutrazol did not flower. Reduced but significant flower bud set was observed on plants treated with paclobutrazol but grown in the greenhouse under natural daylength. Flowering was stimulated by cold treatment coupled with gibberellin sprays and/or repotting to nonpaclobutrazol-treated medium. Chemical name used: β -[(4-chlorophenyl)methyl]-ct-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol).
Elissa M. Novy and Nicholi Vorsa
Accurate estimates of yield and yield components for parental selection would facilitate cranberry breeding efforts. A study was designed to obtain value estimates for traits related to yield. Ten commonly-cultivated varieties grown in a replicated planting, were evaluated in 1991 and 1992 for fruit yield per unit area (FY), average berry weight (BW) and number of berries per unit area, or berry concentration (BC). Averaged over all varieties, FY was significantly greater in 1992. BC was responsible for higher yields in 1992. Regression analysis revealed that BC accounted for more of the variation in FY than did BW in both years. BW accounted for some variation, however, in 1991 when FY was lower. Varieties differed significantly in FY, BW and BC. Hybrid varieties bad significantly greater FY and BW than wild selections. Variation for yield components exists among varieties tested, suggesting genetic gain is possible for yield with additional breeding efforts. In particular, greater fruit set should be emphasized as a breeding objective.
Justine E. Vanden Heuvel and Carolyn J. DeMoranville
. In 1950, the USDA cranberry breeding program released ‘Stevens’, which was selected based on its large fruit size and productivity ( Roper, 2001 ). It now accounts for a large proportion of the cranberry industry in Wisconsin and the Pacific Northwest