Meteorological parameters effect on diurnal and nocturnal transpiration and stomatal conductance grapevine

Until recently, it had been commonly assumed that plant stomata close at night, preventing water loss through transpiration during non-photosynthetic periods. Nocturnal transpiration (TN) accounts for 10-30% of the total daily transpiration (T) flux (Novick et al 2009; Montoro et al. 2016), although higher rates have been reported in some extremes cases (Snyder et al. 2003). Numerous and dynamic meteorological variables impact on evapotranspiration (ET) and T (e.g., relative humidity, air temperature, vapor pressure deficit, wind speed, solar radiation) and many variables that influence the diurnal evapotranspiration (ETD) cannot explain variation in nocturnal evapotranspiration (ETN) (i.e. assimilation rates, light) (Novick et al. 2009).