The Effects of Freezing and Thawing Conditions on Cold Hardiness of Containerized Herbaceous Perennials

12/8/02


Click here to start


Table of Contents

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

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

Conclusions

Conclusions

Comparison of Freezing and Thawing Rates on Survival and Regrowth (2000)

Experimental Premise

Materials and Methods

Materials and Methods

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’

Conclusions

Conclusions

Comparing Hardiness of Established vs. New Plants (2001)

Definition

Hypothesis

Materials and Methods

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

Table summary

Profile plot of rating scale for Geranium ‘St. Ola’

Profile plot of dry weight for Geranium ‘St. Ola’

Conclusions

Conclusions

Possibilities for differences in results?

Comparison of Thawing Rates on Survival and Regrowth (2001)

Materials and Methods

Materials and Methods

Materials and Methods

Results – Tiarella ‘Brandywine’ rating

Table summary

Profile plot of rating scale for Tiarella ‘Brandywine’

Profile plot of dry weight for Tiarella ‘Brandywine’

Tiarella ‘Martha Oliver’ rating

Table summary

Profile plot of rating scale for Tiarella ‘Martha Oliver’

Profile plot of dry weight for Tiarella ‘Martha Oliver’

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

Table Summary

Profile plot of rating scale for Geranium ‘St. Ola’

Profile plot of dry weight for Geranium ‘St. Ola’

Minimum treatment temperature that plants remained marketable

Conclusions

Conclusions

Conclusions

Conclusions

The Effect of Temperature Cycling on Survival and Regrowth (2001)

Materials and Methods

Materials and Methods

PPT Slide

Results – Geranium ‘Cambridge’ Rating

Table Summary

Comparison of two temperature cycling levels at three cycling durations for Geranium ‘Cambridge’

Results – Geranium ‘Cambridge’ Dry weight (g)

Table Summary

Conclusions – Geranium ‘Cambridge’

Conclusions – Dianthus ‘Vampire’

Overall Conclusions

OVERALL THESIS CONCLUSIONS

Future Considerations

Practical Applications

THE END!

Author: Cheryl Bruce

Email: leonard.perry@uvm.edu

Home Page: www.uvm.edu/~pass/perry/

Other information:
Perennial cold hardiness studies of Cheryl Bruce