Abstract
New sources of peonin in Rosa have been found in R. acicularis Lindl., R. arkansana Porter and R. × dulcissima (Lunell) W. H. Lewis. Peonin has been transferred from the native tetraploid, R. arkansana, to fertile tetraploid hybrids with Floribunda and Hybrid Tea roses. Cyanin, peonin and pelargonin combined have been found in 10 seedlings derived from these crosses, a combination not previously reported in Rosa.
A separate pair of blue fluorescing spots bore a positive relationship to each of cyanin, peonin and pelargonin. A negative relationship was observed between yellow fluorescent spots, probably flavonoids, and anthocyanins.
Abstract
In the article “Interaction between an Indigenous Endomycorrhizal Fungus and Mineral Nutrition of Rosa multiflora Understock” by D.R. Paterson, Ruth A. Taber, H.B. Pemberton, and D.R. Earhart (HortScience 21:312-313, Apr. 1986), the last line of data in Table 1 was printed incorrectly.
Roses ( Rosa L.) for the past 5000 years have been one of the most popular flowers used as garden plants, cut flowers, and for the food, medicinal, and fragrance industries ( Shepherd, 1954 ; Zlesak, 2006 ). They were originally domesticated in
In a randomized complete-block design, two separate experiments were conducted to study the response of lead tree Leucaena leucocephala and Hibiscus rosa sinensis to the application of the organic fertilizer, SoilRich. Seedlings of both species were grown in pots filled with growing media containing sandy soil and SoilRich. SoilRich was added at the rates of 0%, 5%, 10%, or 15% (v/v). The obtained results indicated that the application of SoilRich significantly increased plant height, stem elongation, branch number, shoots fresh and dry weights, and enhanced root growth of both Leucaena leucocephala and Hibiscus rosa sinensis. Total nitrogen, phosphorus, and potassium percentages in the shoots were increased in both species as the applied rate of SoilRich was increased. SoilRich treatments increased the water holding capacity of the soil. Moreover, they increased organic matter, total nitrogen, phosphorus, and potassium percentages in the soil. The application of SoilRich at 15% gave the best results.
To update and complete a collection of wild roses in the Montreal Botanical Garden, Canada, in vitro embryo culture was used to propagate several Rosa species that are only available as seeds and difficult to germinate conventionally. Using embryo culture, it was possible to overcome seed dormancy and to rapidly increase the number of species in the collection, and this from a very limited number of seeds obtained from botanical institutions located around the world.
Abstract
Vase life and floral characteristics were studied for Rosa hybrida (cvs. Forever Yours, Briarcliff Supreme, Red Garnette, and Rose Elf) flowers grown in atmospheres containing 300 ± 200, 1000 ± 300, and 2000 ± 500 ppm CO2 for at least half of the daylight hours. Only ‘Red Garnette’ flowers grown in CO2-supplemented air had significantly longer vase life (one-half day) than those produced in normal atmospheres.
Abstract
After 48 days rooting percentages and quality were highest for cuttings from Hibiscus rosa-sinensis plants grown under a reduced light intensity (65% natural light) regardless of (2-chloroethyl)phosphonic acid (ethephon) sprays at 100-5,000 ppm or indolebutyric acid (IBA) treatment to cuttings (0.8%). Ethephon and IBA treatments only affected cuttings from plants grown in 100% natural light, but rooting was not superior to that of cuttings from plants grown under reduced light. After 62 days, there were no treatment differences.
Hibiscus rosa-sinensis L. plants treated three times with 850 mg·liter-1 of the growth retardant chlormequat chloride (CCC) were less susceptible to infestation with Tetranychus urticae (Koch) than water-treated control plants. The difference in mite numbers was noted within 8 days after releasing mites onto test plants. Mean number of mites per treated plant was 3.7, compared to 30 on nontreated plants. This activity was observed on all treated plants 6 months after applying CCC. Significant differences were observed on treated plants that were defoliated and allowed to produce new foliage before being evaluated. Therefore, surface chemical residues were not responsible for reducing mite infestations on CCC-treated plants.
Abstract
Chloroethyl-trimethylammonium chloride (chlormequat) was the most effective of several growth retardants in retarding new growth of field-grown of Hibiscus rosa-sinensis L. without serious side effects. A reduction by one-third to one-half of non-treated growth occurred for 1000 and 3000 ppm (active ingredient), respectively. Over 3½ year period of repeated shearings plus spray applications, 1500 ppm was the most satisfactory following each shearing, while 3000 ppm could be used with alternate shearings. The growth retarding effect of 3000 ppm chlormequat was carried over from previous applications when sheared growth was untreated.
Abstract
Disbudded ‘Brooks 56’ Rosa multiflora Thunb. plants were grown in 0.01 or 0.1 Steiner solutions and inoculated with indigenous vesicular-arbuscular mycorrhizal fungal (VAMF) species, Glomus fasciculatum (Thax. sensu Gerd.) Gerd. and Trappe. Inoculation resulted in a significant increase in both fresh and dry weight of the R. multiflora plants. Increasing the Steiner solution from 0.01 to 0.1 resulted not only in a significant decrease in the rate of VAMF infection, but also in a significant increase in the fresh and dry weight of the multiflora understock.