Year: 1980
Type: article
Abstract: In order to clarify the role of photosynthesis on rooting of hardwood cuttings of grapevines (cv. Delaware), changes in the rate of apparent photosynthesis during propagation in relation to their rooting and shoot growth were investigated under various environmental conditions.1.In the cuttings grown outdoors under a sheet of cheesecloth, the commencement of apparent photosynthesis was shown more than 10 days after the appearance of their roots.2. Comparing the cuttings grown under 20°C, 25°C and 30°C, both rooting and shoot growth were superior with rising temperature at the earlier stage of propagation. At that stage, the change in the rate of apparent photosynthesis expressed on either a cutting basis or a leaf area basis was in agreement with the trend of their rooting. However, at the later stage of propagation, the rooting was best under 20°C, followed by 25°C and 30°C. When expressed on a leaf area basis, the respective peaks of the apparent photosynthesis were shown 30 and 40 days after planting under 30°C and 25°C, but not shown under 20°C. The rates expressed on a cutting basis continued to increase throughout the propagation period under every temperature.3. Among the cuttings grown under different light intensities by shading with the various layers of cheesecloth, rooting was best under two sheets at the end of the propagation period, though both rooting and shoot growth initiated earlier at higher light intensities. Changes in the rate, measured under the proportional light intensities of each treatment, were not always in agreement with the rooting. In the cuttings grown under darkness, the roots were produced in average number of 2.0 per cuttings.4. These results indicated that rooting of hardwood cuttings of grapevines was hardly affected by photosynthesis at an early stage of propagation, however, the cuttings grown under various light intensities developed a greater number of roots than those grown in darkness. It is logical to assume that this imbalance of root numbers, in favor of the light treated cuttings, was due to the affects of photosynthesis and it′s related factors.
DOI: 10.2503/jjshs.48.399
Institutions: Shizuoka University, University of Shizuoka
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W1997665667