screened to identify cultigens having a high concentration of L-citrulline that was stable over environments. Materials and Methods Plant material. Fifty-six ( Table 1 ) watermelon cultigens (open-pollinated and hybrids) grown in Lane, OK (Bernow fine
Angela R. Davis, Charles L. Webber III, Wayne W. Fish, Todd C. Wehner, Stephen King, and Penelope Perkins-Veazie
Marlee A. Trandel, Penelope Perkins-Veazie, and Jonathan Schultheis
should be planted with diploid plants ( Fiacchino and Walters, 2003 ; Freeman and Olson, 2007a ). This is achieved by interplanting a seeded watermelon cultigen or diploid pollenizer in the same field either in the same row as triploid plants or as a
Todd C. Wehner, Rachel P. Naegele, and Penelope Perkins-Veazie
concentration varied widely in the watermelon cultigens tested, ranging from 36 to 120 mg·kg −1 of fresh weight and can vary among production environments ( Leskovar et al., 2004 ; Perkins-Veazie et al., 2001 , 2006 ). The lycopene content has generally not
Emmanouil N. Tzitzikas, Antonio J. Monforte, Abdelhak Fatihi, Zacharias Kypriotakis, Tefkros A. Iacovides, Ioannis M. Ioannides, and Panagiotis Kalaitzis
work, we used a set of published SSR markers ( Danin-Poleg et al., 2001 ; Fernandez-Silva et al., 2008 ; Gonzalo et al., 2005 ) to genetically assess a number of traditional Greek and Cypriot melon cultigens, not tested before, and compare these
Jonathan R. Schultheis and S. Alan Walters
Yellow and zucchini squash (Cucurbita pepo L.) cultivars/elite lines (cultigens) were evaluated over two seasons (fall 1995 and spring 1996) in North Carolina. Different cultigens were tested over the 2-year period for both yellow and zucchini squash, although some cultigens were tested both years. Cultigen recommendations are based on yield, quality, disease resistance, and season grown. Yellow squash cultigens that yielded well include: Destiny III, Freedom III, Multipik, TW 941141, Liberator III (fall 1995); and HMX 4716, Superpik, PSX 391, Monet, Dixie, Picasso, and XPH 1780 (spring 1996). Superior-yielding zucchini squash cultigens were: TW 940981, Tigress, TW 940982, ZS 19, Elite, and Noblesse (fall 1995); and Leonardo, Hurricane, Elite, HMX 4715, Noblesse, and Tigress (spring 1996). Virus ratings for fall 1995 indicated that some transgenic plants with virus resistance withstood virus infection better than those without resistance. These were Freedom III, Destiny III, Freedom II, Liberator III, Prelude II, and TW 941121 (yellow), and Tigress, TW 940982, TW 940981, TW 940866 (zucchini). Virus-infected plants were assayed and viruses were determined to be zucchini yellow mosaic, watermelon mosaic II, and papaya ringspot.
Jennifer Bonina-Noseworthy, J. Brent Loy, Joanne Curran-Celentano, Rebecca Sideman, and Dean A. Kopsell
. The objectives of this study were to determine the effects of year, differences in maturity at harvest, and storage time on total carotenoid concentrations and carotenoid profiles in fruit mesocarp tissue of several cultigens of C. maxima and C
Jonathan R. Schutheis and Todd C. Wehner
Mixtures of different cucumber cultivars or breeding lines (collectively called cultigens) has been used commercially in some parts of the U.S. The objective of this study was to determine whether mixtures of cultigens produce higher yields than pure stands. Three cultigen pairs: Gy 14A+ M 21, Gy 4 + WI 2757 and Regal+ Carolina (higher yielding cultigen listed first) were blended at 0, 25, 50, 75 and 100%, and sown in a spring and summer planting in 1989. Fruit were harvested 6 times in each study and graded according to N. C. standards. Data were collected on yield, earliness, vine size, sex expression and disease resistance. Yields from the spring planting were superior to those from the summer, For maximum fruit weight (Mg/ha), a mixture consisting of 25% of the lower yielding cultigen of each pair should be grown. However, for maximum fruit value ($/ha), the higher yielding cultigen of each pair should be grown in pure stand. We concluded that arbitrary mixtures of cultivars offer no advantage in most cases, although superior mixtures might be produced by evaluating cultigen pairs for complementation.
Blair Buckley III and Katharine C. Pee
A force gauge was used to measure the force required to detach pods from plants of 16 southernpea [Vigna unguiculata (L.) Walp.] cultigens. Pod detachment force (PDF) measurements ranged from 21.4 N for MN-13 to 11.8 N for `Royal Cream'. Pod length, diameter, and weight; basal pod vacancy (inverse of fill); and peduncle synapse length were recorded for each pod sampled for detachment force. There was no strong association between PDF and any of the five traits.
Gary J. Wilfret
Production of stock plants is essential for the asexual propagation of poinsettia, but variability exists among cultigens in the development of axillary shoots under high day/night temperatures of central Florida. Thirty-eight and 44 cultigens were grown during 1995 and 1996, respectively, and were evaluated for cutting production and subsequent growth of harvested cuttings. Plants were pruned twice prior to cutting harvest, with a projected cutting number of 21 in 1995 and 27 in 1996. Cuttings were graded into three groups based upon stem caliper and overall quality: #1, #2, and cull. Number of #1 cuttings/plant in 1995 ranged from 3.4 to 18.6, represented by `Cortez' and `Ball 838', respectively; a majority of the cultigens produced between 14 and 16 cuttings in the top grade. Number of usable (#1 and #2) cuttings ranged from 4.9 to 30.0, represented by `Cortez' and `Jolly Red', respectively, with a mean of 20.2. Stem caliper of cuttings measured 7 cm from terminal apex ranged from 0.55 cm of `Mikkel 520' to 0.91 cm of `Ball 838'. Cuttings of `Cortez' and `Red Splendor' had poor lateral development. During 1996, number of #1 cuttings ranged from 9.8 (`Picacho') to 22.2 (`Freedom'), with a mean of 16.6. Number of usable cuttings ranged from 14.2 to 31.9, represented by `Cortez' and `Spotlight Dark Red', with a mean of 25.3. Stem caliper ranged from 0.55 cm (`Ball 865') to 0.79 cm (`Supjibi'). Cuttings taken from plants of the `Cortez' series produced few, if any, laterals, while `Marblestar' and `Jolly Red' had up to 50% aborted axillary buds.
S. Alan Walters and Todd C. Wehner
Root knot, caused by Meloidogyne spp. is the most important disease of cucumber (Cucumis sativus L.) in North Carolina, causing an average annual yield loss of 12 %. A greenhouse study was conducted 10 screen 924 cultigens (728 accessions, 136 cultivars and 36 breeding lines of C. sativus, and 24 accessions of C. metuliferus Naud.] for resistance to 3 species of root knot nematodes, M. incognita r. 3, M. arenaria r. 2 and M. hapla, Plants were grown from seed in 150-mm diameter clay pots. Two-week-old seedlings were inoculated with 5000 nematode eggs per plant, then evaluated for resistance 9 weeks later. All cultigens evaluated were resistant to M. hapla. Little resistance was found in the cultigens of C. sativus to M. incognita r. 3 and M. arenaria r. 2. Most of the cultigens evaluated were susceptible to both. `Southern Pickler' was resistant to both nematodes (1 % average galls). `Green Thumb and LJ 90430 were resistant to M. arenaria r. 2, Two check cultigens, `Sumter' and Wis. SMR 18, had an average of more than 50% galls. All C. metuliferus cultigens evaluated were resistant to all root knot nematodes tested. PI 482452 was most resistant (1 % average galls), and PI 482443 was least resistant (5% average galls) of the C. metuliferus cultigens tested.