commonly increases the number of petals at the expense of anthers or carpels and thus affects the pollination mechanism ( Comba et al., 1999 ). A related double-flowered variety of lesser periwinkle ( Vinca minor fl . pl .) was found in the wild with
Chin-Mu Chen, Tzu-Yao Wei, and Der-Ming Yeh
Chunxian Chen and William R. Okie
)]. Peaches with showy flowers having extra petals have been used as ornamentals for centuries, often in combination with novel growth forms like upright, weeping and/or dwarf ( Hedrick, 1917 ; Hu et al., 2005 ; Lammerts, 1945 ). These “double
Hsuan Chen, Lan Xue, Tong Li, and Ryan N. Contreras
Resi and to develop appropriate selection methods to optimize simultaneous selection for larger flowers and increased petal numbers. Materials and Methods Plant material. Ten Hibiscus cultivars, including eight double-flower H. syriacus cultivars
Guo-Gui Ning, Xue-Ping Shi, Hui-Rong Hu, Yan Yan, and Man-Zhu Bao
; F1 plant with double flower; F1 plants with single flower. (B) Comparison of petal number in plants that were: diploid (2X) double-flowered, tetraploid (4X) double-flowered, and double-flowered F1 progeny plants (F1D) from a cross of this
Jason D. Lattier and Ryan N. Contreras
winterhardiness, range of flower colors, and unique flower phenotypes, including single-flowered and double-flowered forms ( Contreras and Lattier, 2014 ). Breeders have noted the potential for improvement in althea due to their range of flower color and form and
Jianjun Zhang, Wei Zhu, Jaime A. Teixeira da Silva, Yongming Fan, and Xiaonan Yu
for the bud differentiation of varieties with a double flower. Wang and Zhang (1991) used stereomicroscopy to observe flower bud differentiation of ‘Dafugui’, showing that it consisted of periods of differentiation of bract, sepal, petal, stamen, and
Md. Mizanur Rahim Khan, Mst. Hasnunnahar, and S. Isshiki
the common ways to restore fertility to many interspecific hybrids is to double their chromosomes artificially through colchicine treatment and production of relatively fertile amphidiploids. Restoration of fertility of sterile hybrids between eggplant
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.
Meng-Jen Wu, Lorenzo Zacarias, Mikal E. Saltveit, and Michael S. Reid
Continuous treatment with 8% ethanol doubled the vase life of `White Sim' carnation (Dianthus caryophyllus L.) flowers. Other alcohols, other concentrations of ethanol, or pulse treatments with up to 8% ethanol had little or no effect. Butanol and longer-chain alcohols shortened vase life and caused the flower stem to fold. During their eventual senescence, the petals of ethanol-treated flowers did not inroll; instead, individual petals dried slowly from their tips. Very little ethylene was produced by ethanol-treated flowers, and the normal increase in ACC content and EFE activity was also suppressed. Ethanol treatment also decreased the flowers' sensitivity to exogenous ethylene.
The causes of low production of seeds capable of producing double-flowered plants and of high production of seeds capable of producing single-flowered plants were investigated in zinnias (Zinnia violaceu Cav.). Poor pollination was a major cause of the low seed set. A tubular floret produced abundant pollen; however, the pollen flow to ray stigmas was limited due to the infrequent visitation by pollinators. Moreover, in the double-flowered capitula, newly opened ray petals overlapped on the pistils that unfolded the previous day. These phenomena were considered to cause low seed set in double-flowered plants. Actually, capitula with more tubular florets produced more seeds than those with fewer tubular florets. Pollen germination and plants near zinnias had additional possible influences on seed production of double-flowered zinnias.