Journal Article C-LT C-N Champagne plants under low-temperature treatment Chilling Cold acclimation FD FT Freezing tolerance HRM LG LT N PEP carboxylase PEP carboxylase kinase PQL Pisum sativum Research Support, Non-U.S. Gov't SSCP SSH Suppression subtractive hybridisation T-LT T-N Terese plants under low-temperature treatment WFD circadian rhythm control/unchilled control/unchilled Champagne plants control·unchilled Terese plants freezing tolerance