Factors Influencing the Cold Hardiness of Taxus cuspidata Roots1,2
Open Access
- 1 January 1971
- journal article
- Published by American Society for Horticultural Science in Journal of the American Society for Horticultural Science
- Vol. 96 (1) , 83-87
- https://doi.org/10.21273/jashs.96.1.83
Abstract
The root system of Taxus cuspidata Sieb, and Zucc. exhibited zones of varying cold hardiness. Root hardiness was greatest in sections close to the stem while the root tips were least hardy. The light-colored young roots did not develop hardiness under any of the environmental treatments. Hardiness of the dark mature roots was usually similar to that of the leaves. Under natural conditions mature root hardiness was greater than −29.0°C. Daily application of Alar3 as a soil drench, increased the hardiness of young roots to the hardiness level of mature roots. Amo 16184 was less effective and significantly decreased the hardiness of mature roots. Mature roots from girdled plants did not develop hardiness, indicating their dependence on the top of the plant for development of root hardiness. Roots dehardened more slowly than leaves in the spring.Keywords
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