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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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Elliot H. Norden, Paul M. Lyrene, and Jose X. Chaparro

-density field nursery ( Sherman et al., 1973 ) at Citra, FL. On 1 Dec. 2015, the 55 putative F 1 hybrids that survived in the nursery were examined to eliminate plants that did not look like valid hybrids. Leaf size and shape; presence or absence of pubescence

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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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Mark K. Ehlenfeldt and James L. Luteyn

produced anomalous triploids, it was decided to test a sample group of F 1 hybrids for ploidy verification. For flow cytometry, sampled leaf material (1 cm 2 /20 to 50 mg) together with leaf material of an internal standard with known DNA content ( Zea

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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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Ardeshir Ghaderi and R. L. Lower

Abstract

Three F1 hybrids of cucumber (Cucumis sativus L.) and their inbred parents were grown at 2 day/night regimes (30°/20°C and 27°/14°) under controlled environment. Hybrids were superior in fresh weight under both temperatures at each of 2 stages of growth and had higher phenotypic stability than their parents.