Variability for Freezing Tolerance among 42 Ecotypes of Green-Type Annual Bluegrass
- Julie Dionnea,
- Sophie Rochefortb,
- David R. Huffc,
- Yves Desjardinsd,
- Annick Bertrandb and
- Yves Castonguay *b
- a Royal Canadian Golf Association, 1333 Dorval Dr., Golf House, Suite 1, Oakville, ON, Canada, L6M 4X7
b Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, Québec City, QC, Canada, G1V 2J3
c Dep. of Crop and Soil Sciences, Pennsylvania State Univ., 210 Agricultural Sciences and Industries Bldg., University Park, PA 16802
d Centre de Recherche en Horticulture, Dep. de Phytologie, Univ. Laval, Québec City, QC, Canada G1K 7P4
Limited information exists on the extent of genetic variability for freezing tolerance among perennial biotypes of annual bluegrass (Poa annua L.) that evolved under golf greens management. We characterized the freezing tolerance of 42 ecotypes collected across the United States and in Québec using plants hardened to low temperatures during fall and winter. We subsequently analyzed cold-induced biochemical changes in a subset of ecotypes with varied levels of tolerance. There was a large variability among ecotypes for freezing tolerance expressed as the lethal temperature for 50% of the plants (LT50) with values ranging from <−27.0 to −17.0°C. Variation was observed between ecotypes originating from the same region and even the same golf course. Ecotypes from Québec—better insulated from extreme subfreezing temperatures by reliable and abundant snow cover—developed less freezing tolerance than those evolving under milder winter climates. Significant differences in the concentrations of specific amino acids and carbohydrates were observed among ecotypes. Only fructans of high molecular weight, however, were significantly correlated with freezing tolerance and accounted for as much as 50% of the LT50 variance. A 26-kDa polypeptide that markedly accumulated in cold acclimated crowns was more abundant in plants from Québec. Extensive genetic variability for freezing tolerance among perennial biotypes of annual bluegrass can thus be exploited to mitigate winter damage to golf greens.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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