Full TGIF Record # 59840
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Author(s):Tompkins, Darrel; Bubar, Carol; Toews, Ed; Ross, Jim
Author Affiliation:Ross: Operations Manager, Prairie Turfgrass Research Centre
Title:Physiology of low temperature injury with emphasis on crown hydration in Poa annua L.
Source:PTRC - Prairie Turfgrass Research Centre Annual Report1995 [Alberta]. 1995, p. 22-31.
# of Pages:10
Publishing Information:Olds, Alberta: Prairie Turfgrass Research Centre
Keywords:TIC Keywords: Crown hydration; Poa annua; Winter injury; Cold resistance; Agrostis stolonifera; Comparisons; Hardening; Freezing techniques; Methodology
Abstract/Contents:"Plants resist freezing in the critical cells of crown tissue by increasing the concentration of carbohydrates and other solutes within these cells as the plant hardens in the fall and early winter. In order for plants to completely harden they must freeze for a period of a least one month. The process of hardening is reversed in the spring when these stored foods are rapidly used up and the plant dehardens and becomes more susceptible to low temperature injury when the contents of the cells actually freeze. In a controlled study unhardened bio-types of Poa annua had hardiness levels at -3 ° C to -5 ° C, while completely hardened biotypes had hardiness at -27 ° C to -32 ° C. Cultivars of creeping bentgrass had maximum hardiness levels of -39 ° C when samples were taken from the field. Biotypes of Poa annua rapidly dehardened when subjected to a temperature of 8 ° C for 48 hours. One biotype, MN42 went from a hardiness level of -27 ° C to -10 ° C in this short period of time. There also was great variance amongst biotypes in how rapidly they dehardened. Field samples that were collected from putting greens at the Red Deer Golf and Country Club had dehardened to -7 ° C by mid-April in the spring of 1995. Once snow melt occurred the putting greens rapidly dehardened. Samples collected in the fall of 1995 showed great variation in hardiness levels from one green to the next. Samples previously collected showed there to be considerable variation within the greens themselves."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Tompkins, D., C. Bubar, E. Toews, and J. Ross. 1995. Physiology of low temperature injury with emphasis on crown hydration in Poa annua L.. Prairie Turfgrass Res. Annu. Rep. p. 22-31.
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