Graduate Thesis Or Dissertation
 

Hardiness-maturity relations in red-osier dogwood (Cornus stolonifera Michx.)

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  • Red-osier dogwood plants were grown outdoors in a lathhouse and under two temperature regimes in growth chambers to determine the time of vegetative maturity, the transition between summer and winter dormancy. Xylem water potential (XWP), tissue moisture content, ethylene and ethane production, and electrical impedance were used to try to find a quantitative measure of vegetative maturity that could be used by researchers and nurserymen to predict maturity. XWP showed a significant correlation with tip dieback, but the variability within samples precludes its use as an index of maturity. The change in moisture content was too gradual to be of value as a predictive index. Ethylene production of stem sections correlated with tip dieback, and deserves future testing. Frozen stem sections produced ethane and ethylene, both of which declined as maturity progressed. Electrical impedance values showed promise as the most accurate measure of maturity in red-osier dogwood. A second objective was to relate vegetative maturity to the first stage of cold acclimation in red-osier dogwood. Previous research has suggested that the onset of cold acclimation occurred before rest and about the time that the plants matured. Confirmation that vegetative maturity and the onset of cold acclimation coincide is presented in these studies.
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