Two newly developed cultivars of ninebark [Physocarpus opulifolius (L.) Maxim.], a yellow-leaved cultivar called ‘Dart's Gold’ and a purple-leaved cultivar called ‘Monlo’, were compared with the native for resistance to feeding and oviposition by the specialist ninebark beetle [Calligrapha spiraeae (Say)]. When offered the choice between two types of ninebark, beetles statistically preferred native (P < 0.0001) and ‘Dart's Gold’ (P < 0.0001) over ‘Monlo’, but showed no preference between native and ‘Dart's Gold’ (P = 0.0743). Long-term performance bioassays showed significantly more eggs on ‘Dart's Gold’ than ‘Monlo’ (P = 0.0468). ‘Monlo’ contained the most anthocyanins (P < 0.0001) and chlorophyll B (P < 0.0001) and the least total nitrogen (P = 0.0283) and Kjeldahl nitrogen (P = 0.0014). Anthocyanins are known to act as feeding deterrents and bind with nitrogen, which may explain why beetles avoided feeding on ‘Monlo’ in preference tests.
T.J. Gianfagna, R.H. Merritt, and J.D. Willmott
Aquilegia cultivars `Songbird Bluebird', `Songbird Robin', `Dove Improved', `Colorado Violet/White' and five cultivars from new experimental genetic lines (`Red and White', `Rose and White #1', `Rose and White #2', `Scarlet and Yellow' and `White') will flower without vernalization, but little is known of their response to light or plant growth regulators. Plants were started from seed on 5 Jan. 1999 and grown in either natural light or 33% shade, and treated with gibberellins (GA4/7) at the seven-leaf stage. Flowering time, number of flowers/plant, and plant height were evaluated through 31 May 1999. All five cultivars from the new genetic lines bloomed during the study. `White', grown in shade and treated with GA4/7, bloomed 2 weeks earlier (115 days) than untreated plants grown in natural light (130 days). `Songbird Robin', treated with GA4/7, bloomed in 146 days, and was the only other cultivar to bloom. Flower numbers were greater in natural light than in 33% shade. GA4/7 increased flowering for four of five cultivars, in the new genetic lines, grown in natural light. In shade, GA4/7 increased flowering for three of five cultivars. Height response to GA4/7 was significant in both natural light and 33% shade. Four of the five cultivars in the new genetic lines were taller when treated. All five of these cultivars were taller when grown in natural light verses 33% shade. `White' and both `Rose and White' cultivars were consistently taller, bloomed earlier and were more floriferous when treated with GA4/7.
Caihong Zhong, Shengmei Wang, Zhengwang Jiang, and Hongwen Huang
Weibing Zhuang, Xiaochun Shu, Xinya Lu, Tao Wang, Fengjiao Zhang, Ning Wang, and Zhong Wang
Zhanao Deng and Brent K. Harbaugh
Zhanao Deng and Brent K. Harbaugh
Zhanao Deng, Brent K. Harbaugh, and Natalia A. Peres
Mark A. Mikel
earlier by recombination frequency are shown as shaded boxes. Complex crosses used in the development of new cultivars are simplified as much as possible. Furthermore, uses of strain and plant numbers during inbreeding were omitted unless information is
Kaoru Nakamura, Hirotoshi Hino, Sadao Gunji, Norio Hattanda, Toshio Murata, Hiroshi Tominaga, Koichi Fukumoto, and Ryo Akashi
region in Japan. To promote sweet pea production in Miyazaki prefecture, we are trying to breed new cultivars that have desirable qualities and yield. ‘Mimi’ sweet pea, shown in Figure 1 , a new cultivar with desirable qualities and high yield, is
Dale T. Lindgren and Daniel M. Schaaf
intermountain West, USA Vol. 4 New York Botanical Garden Bronx, N.Y Lindgren, D.T. 1993 The need to register new cultivar names: Penstemon , a case study HortScience 28 82 83 Lindgren, D.T. 2000