Effects of Root Applications of Gibberellic Acid on Photosynthesis, Transpiration, and Growth of Geranium Plants
| Autor: | Richard N. Arteca, E. Jay Holcomb, Carl Schlagnhaufer, De-Sheng Tsai |
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| Rok vydání: | 1985 |
| Předmět: | |
| Zdroj: | HortScience. 20:925-927 |
| ISSN: | 2327-9834 0018-5345 |
| DOI: | 10.21273/hortsci.20.5.925 |
| Popis: | Four concentrations of GA3 were applied to the root systems of 2 geranium (Pelargonium × hortorum L.H. Bailey) cultivars grown hydroponically. The 0.014 μm GA3 treatment promoted substantial increases in relative growth rate (RGR) in both ‘Sincerity’ and ‘Glacier Crimson’ (Syn. ‘Brum’). A maximum stimulation in RGR was obtained at 0.14 μm and 1.4 μm GA3 concentration in ‘Sincerity’ and ‘Glacier Crimson’, respectively. Transpiration rates in both cultivars exhibited a maximum decrease with the 1.4 μm GA3 treatment, whereas net photosynthetic rates and total chlorophyll were unaffected by GA3. The response to GA3 also was evaluated for geraniums grown in a soil mix. There was a difference in cultivar responsiveness to root applications of GA3. Cutting production was greatest with 2.8 μm GA3 treatment and fresh weight, dry weight, and cutting length were greatest with a 28 μm GA3 concentration for ‘Sincerity’. The number of cuttings and length of cuttings were greatest with GA3 at a 56 μm GA3 concentration, and fresh and dry weight were maximized with a 28μm GA3 concentration for ‘Glacier Crimson’. |
| Databáze: | OpenAIRE |
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