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Zoysiagrass Species and Genotypes Differ in Their Winter Injury and Freeze Tolerance

^a Dep. of Horticulture, Univ. of Arkansas, 316 Plant Sciences Bldg., Fayetteville, AR 72701
^b Dep. of Agronomy, Purdue Univ., 915 W. State St., West Lafayette, IN 47907-2054. Purdue Univ. Agric. Exp. Stn. Journal 2006-18055

View larger version (11K): [in this window] [in a new window]   Figure 1. Sample sigmoidal curve fit to regrowth data from a pilot study using ‘Meyer’ zoysiagrass. Freeze tolerance (LT50, temperature resulting in no regrowth from 50% of the plants) was determined by nonlinear regression (PROC NLIN [Gauss-Newton method]) using the following equation: Survival = a + (b – a)/{1 + exp [c(Tm – T)]} where a is the base line of survival, b is the maximum survival, c is a function of the slope of the line at the inflection point, Tm is the temperature at the inflection point (LT50), and T is the treatment temperature.

View larger version (45K): [in this window] [in a new window]   Figure 2. (A) Air and (B) soil temperatures at a 2.5-cm depth during the winter and spring of 2004–2005 and 2005–2006. Mean of two soil probe measurements.

View larger version (9K): [in this window] [in a new window]   Figure 3. Relationship (r2 = 0.48, P = 0.0088) between zoysiagrass freeze tolerance (LT50, temperature resulting in no regrowth from 50% of the plants; growth chamber cold-acclimated and frozen in a cold stress simulator) and winter injury in the field for 13 genotypes.