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Cultivar and Environmental Effects on Freezing Tolerance of Narrow-Leaf Plantain

USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802

View larger version (22K): [in a new window]   Fig. 1. Survival of plantain cultivars following exposure to –12°C for 3 h in controlled environment chambers. Bars superscripted by different letters are significantly different at P < 0.05 as determined by protected LSD.

View larger version (42K): [in a new window]   Fig. 2. Cultivar effects on shoot (A) and root (B) biomass following 3-wk growth in a controlled environment chamber (Initial Growth), after three 4- to 5-d drought cycles (Drought Treatment) and following a 3-wk cold hardening period (Cold Hardening). There was no significant cultivar x trial x water interaction, therefore, data are averaged across trials and drought treatments. Bars superscripted by different letters are significantly different at P < 0.05 as determined by protected LSD.

View larger version (29K): [in a new window]   Fig. 3. Cultivar effects on shoot (A) and root (B) structural relative growth rates during the cold hardening period. TNC-free dry matter was determined by subtracting total nonstructural carbohydrates from total dry matter and differentiates structural growth from the accumulation of storage compounds. Bars superscripted by different letters are significantly different at P < 0.10 as determined by protected LSD.

View larger version (45K): [in a new window]   Fig. 4. Cultivar effects on tissue nonstructural carbohydrate concentration (A) and content (B) following a 3-wk cold hardening period. There was no cultivar x drought x trial interaction, therefore, data are averaged across drought treatments and trials. Bars superscripted by different letters are significantly different at P < 0.05 as determined by protected LSD.