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- Author or Editor: George J. Wulster x
A software application for the personal computer has been developed using the macro languages of Lotus l-2-3 Release 2.2 and the spreadsheet compiler Baler XE Release 1.0E to provide Easter lily (Lilium longiflorum Thunb.) growers with a tool to track and predict various developmental stages of the crop during greenhouse forcing.
Abstract
In the article “A Nondestructive Method for Measuring Root System Surface Area” by George J. Wulster (HortScience 20:1058–1060, Dec. 1985), the author requests that the following correction be noted: The 3rd line under Gel Construction on p. 1058 should be changed from “… HHR (0.65gm/l) was added slowly to 2 liters … ” to “… HHR (0.65 gm/100 ml) was added slowly to 2 liters …”.
Abstract
A method is described for obtaining nondestructive estimates of root system surface area. The technique is based on the assumption that the larger the root system, the more gel of a given viscosity will adhere to it. The correlation between gel adherence and 5 parameters of root system size (root length, root fresh weight, root dry weight, root volume, and root surface area) is established.
Easter Lilies (Lilium Longiflorium) were grown in potting media containing 50% peatmoss and 50% vermiculite V/V or amended with 25, 33, or 50% (V/V) composted municipal sludge.
Macro and micro nutrient levels were determined for the various media formulations using either a water or a Mehlich III extraction procedure. Foliar levels of micro and macro nutrients were determined at anthesis. Final plant height and number of buds per plant were measured for each treatment.
No media formulations were phytotoxic; however, several micro element levels increased with increasing composted sludge content in foliar samples. These increasing foliar levels of Cu, Fe, Zn correlated well with media levels when Mehlich III was the extraction method. A similar correlation was not found with water as the extractant.
Growth and flowering of Freesia hybrida Bailey for the container-plant market can be controlled chemically using growth retardants and environmentally by cold storage of corms at 5C for 2 to 6 weeks before planting. Corms stored at 5C for 4 weeks flowered 20 days earlier than corms not stored at 5C. Preplant 5C storage of corms also reduced leaf and flower height. An ancymidol soil drench (3 mg) reduced leaf height and flower height by more than 50% and delayed flowering by 9 days. Combining growth regulator application with cold storage of corms produced the greatest reduction in leaf height and flower height. Moreover, plants flowered earlier than controls when corms were stored for at least 4 weeks, regardless of growth regulator treatment. Chemical name used: α-cyclopropyl-α- (4-methoxyphenyl) -5-pyrimidine methanol (ancymidol).
Growth and flowering of Ixia hybrids as potted plants can be controlled environmentally by cool preplant storage of corms, regulation of greenhouse forcing temperatures, and application of a growth retardant. Paclobutrazol applied as a preplant corm soak, a postemergent drench, or a postemergent spray in combination with a 2- to 4-week preplant storage of corms at 7 °C, and an 18 °C day/10 °C night forcing temperature produced attractive and marketable plants. Chemical name used: β-[(4-chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol, Bonzi®).
A silver thiosulfate (STS)-mediated increase in pathogen susceptibility was investigated using shoot cuttings from stock plants of pelargonium (Pelargonium hortorum Bailey cv. Ringo Scarlet) with and without STS treatment. Callusing and rooting were reduced in shoot cuttings from ST&treated plants. The pathogen-tolerant tissue (no STS) was shown to produce enhanced levels of phenolic esters and glycosides during wound healing. Reactivity to the histochemical stain phloroglucinol-HCL was also enhanced during wound healing in cuttings from plants that had not received a silver treatment.
Growth and flowering of Ixia hybrids as potted plants can be controlled environmentally by cool preplant storage of corms, regulation of greenhouse forcing temperatures, and application of a growth retardant. Paclobutrazol applied as a preplant corm soak, a postemergent drench, or a postemergent spray in combination with a 2- to 4-week preplant storage of corms at 7 °C, and an 18 °C day/10 °C night forcing temperature produced attractive and marketable plants. Chemical name used: β-[(4-chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol (paclobutrazol, Bonzi®).
Abstract
Cyanide-resistant respiration in carnation (Dianthus caryophyllus L.) petal tissue increased daily until 3 days after flowers were harvested. Mitochondria from petals exhibited only cyanide-resistant respiration when malate and pyruvate were provided as substrate. Although intact petals from freshly harvested flowers exhibited little cyanide-resistant respiration, mitochondria isolated from them were highly cyanide-resistant in their respiration if malate and pyruvate were provided as substrate. Pyruvate, in mitochondria, was capable of releasing mitochondria inhibited by cyanide in the presence of malate. Pentose-phosphate pathway activity was significant throughout the postharvest period, but was maximum 5 days after flowers were harvested. The gas exchange quotient (GEQ) was 1 for the first 3 days after harvest, declining on days 4 and 5 and dramatically increasing on day 6 as a result of a climacteric increase in CO2 evolution accompanying flower wilting.