). Near anthesis, B. oleracea stems elongate rapidly. In many Brassica species this elongation (bolting) is regulated by GA independently from its role in reproductive induction ( Mandel et al., 1992 ). Here, we test whether GA can trigger that process
Denise V. Duclos and Thomas Björkman
Heather D. Toler, Craig S. Charron, Carl E. Sams, and William R. Randle
Plants in the family Brassicaceae play integral roles in the diets of the world's population. Brassica oleracea , for example, includes the following staple food cultivars: cabbage, broccoli, cauliflower, kale, kohlrabi, and brussels sprouts
Metin Turan, Nizamettin Ataoglu, Adem Gunes, Taskin Oztas, Atilla Dursun, Melek Ekinci, Quirine M. Ketterings, and Yuh Ming Huang
vegetative and reproductive tissues of canola and sunflower plants grown in nutrient solution Plant Soil 243 243 252 Booij, R. 2000 Effects of nitrogen on yield components of Brussels sprouts ( Brassica oleracea L. var. gemmifera DC) European Journal of
Mary C. Christey and Elizabeth D. Earle
Peduncle explants from 12 Brassica oleracea L. lines representing five varieties [broccoli (italica), cabbage (capitata), cauliflower (botrytis), Chinese broccoli (alboglabra), and rapid-cycling B. oleracea] readily regenerated shoots in vitro. Average regeneration rates of more than 75% were obtained for most lines, with up to 35 shoots per explant. Shoots were visible within 7 to 10 days. Initial regeneration was polarized, occurring mainly from the basal end of explants. Linsmaier-Skoog-based medium containing 1 mg BA/liter was suitable for shoot regeneration from all 12 lines tested. Plants were rooted on hormone-free medium and transferred to soil. Chemical name used: benzyladenine (BA).
Pai-Tsang Chang, Marc W. van Iersel, William M. Randle, and Carl E. Sams
Plant culture. On 19 June 2006, seeds of a rapid cycling Brassica oleracea L. population (Crucifer Genetics Cooperative, Department of Plant Pathology, University of Wisconsin, Madison, WI) were sown in growing cubes (Smithers-Oasis, Kent, OH
May Elfar Altamimi, Rhonda R. Janke, Kimberly A. Williams, Nathan O. Nelson, and Leigh W. Murray
petiole sap in vegetables. Petiole sap nitrate-nitrogen (PSNN) levels associated with maximum growth rate or yield have been determined for vegetable crops like cabbage ( Brassica oleracea L. Capitata group) ( Gardner, 1989a ; Schulbach et al., 2007
Mark W. Farnham and Kent D. Elsey
Resistance of a Brassica oleracea germplasm collection (broccoli, Italica Group; cauliflower, Botrytis Group; and collard and kale, Acephala Group) to silverleaf whitefly (SLW; Bemisia argentifolii Bellows and Perring) infestation was evaluated using several measures of insect infestation (including adult vs. nymph counts) taken at plant growth stages ranging from seedling to mature plant. An initial study was conducted in an outdoor screen cage artificially infested with the SLW adults; subsequent field trials relied on natural infestations. The glossy-leaved lines (`Broc3' broccoli, `Green Glaze' collard, and `SC Glaze' collard) had low SLW infestations in cage and field tests. SLW adult counts were less variable than similar comparisons using nymphal counts, although adult and nymph counts were positively and significantly correlated at late plant stages. Based on this study, comparing relative SLW adult populations would be a preferred criterion for identifying B. oleracea resistance to this insect.
K.D. Elsey and M.W. Farnham
The relative resistance of 18 cultivars of Brassica oleracea L. to attack by the sweetpotato whitefly [Bemisia tabaci (Gennadius)] was studied in screen cage (spring), field (autumn), and laboratory tests. The B. oleracea entries consisted of six types, including 16 green and two red cultivars. Cabbage (Capitata Group) and broccoli (Boytrytis Group) were less infested than other crops in a screen cage test, with kale, collard (Acephala Group), and brussels sprouts (Germmiter Group) experiencing relatively high and kohlrabi (Gongtlodes Group) intermediate infestations. Relative ranking of crops was similar in an autumn field study, with the exception of brussels sprouts, which had an intermediate level of infestation. Differences in numbers of whiteflies among cultivars within crops were negligible or inconsistent, except that red cultivars of brussels sprouts (`Rubine') and cabbage (`Red Acre') were much less infested than green cultivars. In a laboratory test, differences of whitefly oviposition and nymphal survival and development were small, indicating that nonpreference factors, rather than antibiosis, are the best explanations for differences in the numbers of whiteflies among the B. oleracea cultivars that were tested,
W. Msikita, H.T. Wilkinson, and R.M. Skirvin
A system to propagate tronchuda (Brassica oleracea var. tronchuda Bailey syn. costata L.) from main stem and side shoot cuttings was developed by removing the main stem (three to four leaves) and, later, side shoots from S-week-old plants, transplanting them into small pots, and growing them under a mist system for 4 weeks. New root growth appeared on cuttings within 3 weeks. Rooting frequency varied among cultivars and explant types. For all cultivars, side shoot cuttings rooted better than main stem cuttings (99.7% vs. 84.8%). For all cultivars, seed-propagated plants and side shoot cuttings produced leaves with significantly higher fresh weight than the main stem cuttings for three of the five cultivars. The average number of leaves per plant for four cultivars was, however, not significantly affected by propagation method. Average leaf count and fresh weight per plant were significantly higher for `Portuguesa' than for `Ana Maria'. `Couve Penca'. `Vilinda', and `Penca de Chaves' for all three propagation sources.
Ralf Uptmoor, Mildred Osei-Kwarteng, Susanne Gürtler, and Hartmut Stützel
the beginning of the stress cycle and during leaf area measurements in Brassica oleracea . Expt. 2. Plants were cultivated in an α-lattice design with two replications. For data analysis, the experiment was treated as RCBD because no