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Honghui Gu, Jiansheng Wang, Huifang Yu, Zhenqing Zhao, Xiaoguang Sheng, Jisuan Chen and Yingjun Xu

-glucoraphanin F 1 hybrids ( Table 2 ). We first evaluated two major commercial cultivars, Youxiu and Lvxiong90, which exhibited the highest concentrations of glucoraphanin and progoitrin, respectively, among commercial cultivars in our previous investigation

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Cecilia E. McGregor and Vickie Waters

distortion was observed in the F 2 mapping population developed from a cross between PI 296341- FR (citron type) and ‘New Hampshire Midget’ ( Hawkins et al., 2001 ). F 1 hybrids between C. lanatus × C. colocynthis showed diminished pollen viability

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Liwang Liu, Guang Liu, Yiqin Gong, Wenhao Dai, Yan Wang, Fanmin Yu and Yunying Ren

. Cabbage has prominent heterosis and F 1 hybrid seeds are widely used in commercial production ( Fang et al., 2000 ). Generally, F 1 hybrid seeds in Brassica vegetables are produced using established self-incompatible or male-sterile systems. However

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Judy A. Thies, Sharon Buckner, Matthew Horry, Richard Hassell and Amnon Levi

(which we have designated RKVL) have proved to be vigorous rootstocks, producing significantly higher watermelon yield than the commercially available cucurbit rootstocks in fields infested with RKNs ( Thies et al., 2010 ). F 1 hybrid rootstocks have

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Yau-Wen Yang, Ching-Chang Tsai and Tsu-Tsuen Wang

, for helping us to evaluate this F 1 hybrid in a growth chamber. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to

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Ralph Scorza and Margaret Pooler

Doubled haploid peach [Prunus persica (L.) Batsch] lines were cross-pollinated to produce F1 hybrids. F1 hybrids were evaluated at 3, 7, 8, and 9 years after field planting for tree growth as measured by trunk cross-sectional area, and for fruit production as measured by total weight, total number, and production per unit trunk cross-sectional area. Fruit quality of most F1 hybrids was within the range of quality observed in progeny of standard peach cultivars, and tree growth and productivity were similar to those of standard cultivars. F1 hybrids present the possibility of developing scion varieties that can be produced from seed, thus eliminating the need for grafting scions onto rootstocks in situations where specific, adapted rootstocks are not necessary. They could also be used to develop genetically uniform seed-propagated rootstocks. The use of doubled haploid-derived F1 peach hybrids, however, would require reliable, efficient production techniques.

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M. Ulloa-Godinez, J. N. Corgan and M. Dunford

Cytogenetic studies were performed on Allium fistulosum, A. cepa. their F1 hybrid, and ten backcross (BC1) progenies [(A. fistulosum × A. cepa) × (A. cepa) 1. In meiosis the F1 hybrid showed 41 percent hetercmorphic bivalent pairing with 10.6 +. 1.8 `chiasmata per cell. Meiocytes were observed with one, two and three bridges and fragments, indicating at least three paracentric inversions. Multivalent associations indicate at least two translocations, one involving the satellite chromosome. The percentage of bivalent pairing, bridges and fragments, and multivalent associations varied in BC1 progenies. The F1 hybrid and all of the BC1 plants were either sterile or had very little seed set. The satellite chromosomes used as cytological markers showed variation in nucleolus position, degree of attachment and number.

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Kevin M. Crosby, Richard L. Fery, Daniel I. Leskovar and Justin Butcher

The Agricultural Research Service of the U.S. Department of Agriculture and the College of Agriculture and Life Sciences of Texas A&M University announce the release of the high-yielding, orange-fruited, Habanero-type, F 1 hybrid pepper ( Capsicum

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Randy G. Gardner and Dilip R. Panthee

. Origin ‘Mountain Magic’ is the F 1 hybrid of NC 2 CELBR × NC 2 Grape ( Fig. 1 ). NC 2 CELBR is a large-fruited, determinate tomato breeding line, which combines moderate resistance to early blight with a high level of late blight resistance based on the

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Neil O. Anderson, Peter D. Ascher and James J. Luby

The change from asexual to sexual propagation for annual and perennial bedding plants has been successfully accomplished for floral crops, e.g., Pelargonium. Seed-propagated cultivars do not necessarily possess the clonal uniformity of vegetatively propagated cultivars. In the development of F1 hybrid garden chrysanthemums, this lack of uniformity was assessed with the use of consumer sensory evaluations. Seedlings (n = 10–20 plants/cross) were transplanted for field trials in St. Paul and five Minnesota branch stations each year during 1988–94 to test for G × E. Early flowering F1 hybrids, developed from inbred parents with general combining ability, were evaluated for flowering earliness, plant uniformity, and a general rating. Consumer rankings of top performers were not significantly different (5% level) from mum breeders. The top performers for all three ratings were selected each year for repeat evaluation the next year. The two highest performing F1 hybrids were submitted for All American Selection Trials in 1995.