The Effects of Freezing and Thawing Conditions on Cold Hardiness of Containerized Herbaceous Perennials
Perennial Industry
What does this mean?
Container Production
Major Disadvantage of Container Production
Why are plants in containers more susceptible to cold?
Root Physiology
Hardiness zones that are useful for soil grown plants, have less value for container grown systems
Mechanisms of Freezing
Degree of injury from an episode of freezing and thawing is the result of several factors
Where does water freeze in the cell?
Extracellular Freezing
Intracellular Freezing
Plant Cold Hardiness
Cold Hardiness – 2 Stages
Other factors affecting degree of cold hardiness
Perennial cultivars studied
Dianthus
Tiarella
The Experiments
Materials and Methods – Experimental Setup
Materials and Methods – Freezing Procedure
Materials and Methods – Plant Evaluation
Comparison of Acclimation and Freezing Durations on Hardiness (2000)
Materials and Methods
Factorial ANOVA
Results Significance of rating data
Results Significance of dry weight data
Results - MSE
Conclusions
Comparison of Freezing and Thawing Rates on Survival and Regrowth (2000)
Experimental Premise
PPT Slide
t-test values comparing rating data between rapid and slow thawing
Profile plot of rating scale for Geranium ‘Cambridge’
t-test values comparing dry weight data between rapid and slow thawing
Profile plot of dry weight for Geranium ‘Cambridge’
Comparing Hardiness of Established vs. New Plants (2001)
Definition
Hypothesis
Results - Tiarella
T. ‘Martha Oliver’ rating data
Profile plot of rating scale for Tiarella ‘Martha Oliver’
Profile plot of dry weight for Tiarella ‘Martha Oliver’
T. ‘Brandywine’ rating data
Table summary
Profile plot of rating scale for Tiarella ‘Brandywine’
Profile plot of dry weight for Tiarella ‘Brandywine’
MSE values for ‘Martha Oliver’ and ‘Brandywine’
Results – Geranium ‘St. Ola’
G. ‘St. Ola’ rating data
Profile plot of rating scale for Geranium ‘St. Ola’
Profile plot of dry weight for Geranium ‘St. Ola’
Possibilities for differences in results?
Comparison of Thawing Rates on Survival and Regrowth (2001)
Results – Tiarella ‘Brandywine’ rating
Tiarella ‘Martha Oliver’ rating
MSE values for ‘Brandywine’ and ‘Martha Oliver’
Geranium ‘Karmina’ Rating
Table Summary
Profile plot of rating scale for Geranium ‘Karmina’
Profile plot of dry weight for Geranium ‘Karmina’
Geranium ‘St. Ola’ Rating
Minimum treatment temperature that plants remained marketable
The Effect of Temperature Cycling on Survival and Regrowth (2001)
Results – Geranium ‘Cambridge’ Rating
Comparison of two temperature cycling levels at three cycling durations for Geranium ‘Cambridge’
Results – Geranium ‘Cambridge’ Dry weight (g)
Conclusions – Geranium ‘Cambridge’
Conclusions – Dianthus ‘Vampire’
Overall Conclusions
OVERALL THESIS CONCLUSIONS
Future Considerations
Practical Applications
THE END!
Email: leonard.perry@uvm.edu
Home Page: www.uvm.edu/~pass/perry/
Other information: Perennial cold hardiness studies of Cheryl Bruce