Photosynthetica 2010, 48(2):317-319 | DOI: 10.1007/s11099-010-0040-5

Chlorophyll fluorescence as a tool for evaluation of viability in freeze-stressed grapevine buds

L. Zulini1,*, C. Fischer1, M. Bertamini1
1 Fondazione Edmund Mach, IASMA Research and Innovation Centre, San Michele all'Adige (TN), Italy

This study examined the utility of the ratio of variable fluorescence to maximum fluorescence (Fv/Fm) to detect freezing injury on buds of two Vitis vinifera cultivars: Pinot noir and Pinot gris. Freezing treatments on buds caused a decrease both in Fv/Fm and percentage of budburst, more severely on Pinot gris than Pinot noir, specifically at the lower temperature (-20°C). Fv/Fm ratio showed a close correlation with percentage of budburst, and a threshold of the lethal Fv/Fm was proposed as an indicator of bud mortality.

Additional key words: bud break; frost damages; maximal photochemical efficiency of PSII; temperature; viability test; woody tissues

Received: June 24, 2009; Accepted: February 5, 2010; Published: June 1, 2010  Show citation

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Zulini, L., Fischer, C., & Bertamini, M. (2010). Chlorophyll fluorescence as a tool for evaluation of viability in freeze-stressed grapevine buds. Photosynthetica, 48(2), 317-319. doi: 10.1007/s11099-010-0040-5
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