Search Results

You are looking at 1 - 2 of 2 items for

  • Author or Editor: K. A. Timmis x
Clear All Modify Search

Abstract

Electrical impedance ratios and water contents were measured during the development of vegetative maturity and dormancy in a clone of red-osier dogwood Cornus sericea L.) on plants exposed to 16 hour and 12 hour photoperiods in growth chambers to selectively prevent or induce dormancy. Vegetative maturity was designated as the point at which buds were no longer stimulated to grow following artificial defoliation. After this time the ratio of impedance values obtained from the frequencies 10 kHz:100kHz increased and tissue water decreased. Electrical impedance ratios were more easily measured and showed less variation between plants. We conclude that electrical impedance ratios are a means of identifying the onset of vegetative maturity and dormancy in woody deciduous species.

Open Access

Abstract

Attempts to measure and interpret the attenuation of electrical square waves in red-osier dogwood (Cornus series L.) and apple (Malus sp.) indicate that the difficulties of interpreting and obtaining reproducible quantitative data makes them of little value as criteria of dormancy in woody plants.

Open Access