Foliar Application of Abscisic Acid Increases Freezing Tolerance of Field-Grown Vitis vinifera Cabernet franc Grapevines

Yi Zhang; Imed E. Dami

doi:10.5344/ajev.2012.12006

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Figure 1
Chlorophyll content progression in ABA-treated and untreated Cabernet franc grapevines grown at (A) Wooster (2009) and (B) Kingsville (2010). For clarity, only one ABA plot was presented, which is V30 treatment in (A) and V20 treatment in (B) and corresponds to ABA application at 30 and 20 days after 50% veraison, respectively. *, **, *** indicate significance at p ≤ 0.05, 0.01, 0.001, respectively.
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Figure 2
Effect of ABA on bud dormancy (days to 50% budbreak) of Cabernet franc grapevines grown at (A) Wooster and (B) Kingsville during the 2010–2011 season. For clarity, only one ABA plot is presented, which is the average of V and V20 treatments (corresponding to ABA aplication at 50% veraison and 20 days after 50% veraison). *, **, *** indicate significance at p ≤ 0.05, 0.01, 0.001, respectively.
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Figure 3
Effect of ABA on freezing tolerance (LT50) in Cabernet franc grapevines grown in Wooster during the (A) 2009–2010 season and the (B) 2010–2011 season and in Kingsville during the (C) 2010–2011 season. For clarity, only treatments with significance are shown. The ABA plot is the average of V and V30 in A and of V and V20 in B and C. (V, V20, and V30 correspond to ABA application at 50% veraison and 20 and 30 days after 50% veraison.) *, **, *** indicate significance at p ≤ 0.05, 0.01, 0.001, respectively.
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Figure 4
Bud water content (% FW) progression in ABA-treated and untreated Cabernet franc grapevines grown in Kingsville during the 2010–2011 season. For clarity, the ABA plot represents the average of V and V20. *, **, *** indicate significance at p ≤ 0.05, 0.01, 0.001, respectively.
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Figure 5
Correlation of (A) LT50 and bud water content from samples collected between 26 Oct 2010 and 18 Jan 2011 in Kingsville; (B) bud injury after −23°C on 22 Jan 2011 vs. water content from samples collected on 18 Jan 2011. ABA values are from V and V20 treatments.