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Guo-Gui Ning, Xue-Ping Shi, Hui-Rong Hu, Yan Yan, and Man-Zhu Bao

diverse array of varieties ( Griesbach, 2007 ). As the most popular petunia varieties, double-flowered petunias had been well studied from an anatomical angle, but the genetic background of the double-flower form in petunia has not been investigated

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Rozlaily Zainol and Dennis P. Stimart

A double-flower form of Nicotiana alata Link & Otto was characterized genetically as a monogenic recessive trait expressed when homozygous. Reciprocal crosses demonstrated no maternal effect on expression of double flowers. A single dominant gene expressed in the homozygous or heterozygous state caused the single-flower phenotype. The symbol fw is proposed to describe the gene controlling double-flower phenotype.

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Rozlaily Zainol, Dennis P. Stimart, and Ray F. Evert

Anatomical analysis was performed using a double-flowered mutant of Nicotiana alata Link & Otto. Flower doubleness resulted from petaloid modification of the androecium. Vascularized petal-like outgrowths arose from the anther, connective, and filament of the stamen. The vasculature in petaloid outgrowths from the anther and upper part of the filament originated from and was continuous with the vascular bundle of the filament. In contrast, the vascular bundles formed in the outgrowths from the lower part of the filament developed independently of the vascular bundle of the filament and were not connected to it at any time. Emergences consisting of epidermal and ground parenchyma tissue and lacking vascularization arose from the filament.

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Huan-Keng Lin, Tzu-Yao Wei, Chin-Mu Chen, and Der-Ming Yeh

the genetics and inheritance of trailing habit and flower form, and 3) develop new periwinkle progeny with trailing habit and double flowers. Materials and Methods All the plants were raised from seeds, and young plants were transplanted into 9-cm pots

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Pei-Wen Kan, Yu-Ching Cheng, and Der-Ming Yeh

, and that double flower is dominant over single flowers. The double-flowered heterozygote occasionally has markedly fewer petals than the double-flowered homozygote of gloxinia ( Clayberg, 1975 ; Shalit, 2000 ). Double-flowered gloxinia cultivars with

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Sandra M. Reed and Timothy A. Rinehart

landscape. During its several centuries of cultivation in Japan, numerous cultivars of H. macrophylla ssp. serrata (including double-flower, variegated, and colored leaf forms) were selected ( Dirr, 2004 ). A Hydrangea checklist was published

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Mozhgan Zangeneh and Hassan Salehi

double flowers (5 accessions). Subcluster B contained two accessions of Shahla with 60% similarity ( Fig. 2 ). In each subcluster, single and double flowers formed separate clusters. Accession 5 fell between 3 (semidouble flower) and 7 (double flower

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James N. Moore, Roy C. Rom, Stanley A. Brown, and Gerald L. Klingaman

Three ornamental peaches and one ornamental nectarine were released in 1992 from the Arkansas peach breeding program. `Tom Thumb' is a red-leaf dwarf peach with attractive foliage that is retained throughout summer. `Leprechaun' is a green-leaf dwarf nectarine with small but attractive, freestone fruits. `Crimson Cascade' and `Pink Cascade' are red-leaf peaches with trees of standard size that exhibit a weeping growth habit. `Crimson Cascade' produces double flowers that are dark red while `Pink Cascade' double flowers are pink. The attractive plants of these cultivars should be of value in home landscapes.

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Jen A. McComb, Chris Newell, and George Lullfitz

A naturally occurring mutant of Chamelaucium uncinatum Schauer (Geraldton wax) is described. It has double flowers with the staminodes transformed into petals. Pollen is exuded from the anthers but is not deposited on the pollen presenter in a lipid droplet, which is normal for the species. An anomalous secondary flower with petals, stamens, and gynoecium is present in the ovary.

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Owen M. Rogers

Current lilac breeding programs at the University of New Hampshire focus on the later (June) blooming species of Syringa with goals of extending the season of bloom selecting slower growing forms and developing lines with double flowers. Progress toward these goals and others, e.g., true dwarfs, will be discussed and illustrated.

Every university in the northeast includes woody ornamentals in its program to some degree. The University of New Hampshire is an official test site for ornamental from NE-9 and NC-7 germplasm programs and the National Arboretum's new introduction program. The value of these programs and their future direction will be discussed.