Applying Chlorophyll Fluorescence Technique to Cold Hardiness Studies of Grapevines

摘要

Woody tissue cold hardiness and chlorophyll fluorescence of Concord (Vitis labruscana Bailey) grapevines were measured regularly during the dormant seasons in 1997 to 1998, 1998, and late winter 2000. Chlorophyll fluorescence was measured after a controlled freeze-stress. Fv/Fm was used as an indicator of Viability. Response magnitude varied with each portion of the dormant season and the type of woody tissues. Fv/Fm temperature inflection points (temperature at which no and 100/100 tissue injury occurred) were closely Related with T_50 (temperature at which 50/100 of the sample was injured) calculated from a regrowth test.