Killing of Plant Tissue by Low Temperature 



233 



It will be seen that there is little difference between the killing 

 temperature of those in storage and those in a storage room at 10 to 

 37 F. higher temperature and those kept out in the soil. However, 

 those that were in a growing condition were less hardy but with 

 nothing like the difference that would be observed in the case of twigs 

 kept under similar conditions. The reason the roots kept in the 

 basement store room were more hardy than we should expect, is 

 possibly because of their being kept in a somewhat dry condition. 



In the case of young peach roots, those kept in cold storage 

 showed a greater hardiness than those kept in the soil outside. Some 

 growth may have taken place in the roots kept out in the soil. The 

 following table gives results of the freezing of peach roots: 



Table 32. Showing Relative Resistance to Low Tempera- 

 ture OF Year-Old Seedling Peach Roots Growing and in a 

 Thoroughly Dormant Condition. 

 Date of Freezing, March 22, 1913. 



