摘要 : A comparative study on water-use-efficiency (WUE) under severe water deficit and recovery was conducted on potted grapevines of 'Grenache', 'Syrah' and 'Chardonnay' cultivars grown in Mallorca (Spain). Deficit irrigation was estab... 展开 A comparative study on water-use-efficiency (WUE) under severe water deficit and recovery was conducted on potted grapevines of 'Grenache', 'Syrah' and 'Chardonnay' cultivars grown in Mallorca (Spain). Deficit irrigation was established according to the leaf maximum daily g_s to achieve severe water deficit conditions in the lapse of one week. The goal was to analyze how g_s is regulated under water stress and recovery, as well as how water stress affects the adjustments of WUE at leaf and whole plant level. Soil water content, climatic conditions, leaf photosynthesis, transpiration, g_s and mesophyll conductance (g_m) were recorded daily throughout the experiment. Water relations and plant hydraulic conductivity (Kh_Plant), were performed on five specific sampling days: the day the desired stomatal conductance (50 mmol m^-2 s^-1) was first achieved (day 0), seven days after sustaining the plants at constant soil moisture, just before re-watering (day 7), and then 1, 2 and 7 days after re-watering. The relative contribution of g_s and g_m limitations during acclimation to water stress changes from predominant g_s early during water stress to similar g_s and g_m after acclimation. Nonetheless during re-watering photosynthesis recovery was mostly limited by g_s, since stomatal closure recovered much more slowly than g_m. Water stress induced an increase in WUE, which interestingly persisted many days after re-watering. Kh_Plant variations during drought and recovery were in accordance with g_s values. However, the relationship with g_m variations was lower. 'Chardonnay' showed the largest differences between water stress and irrigated plants and the lowest leaf water potential. Under drought and recovery this cultivar maintained lower g_s and leaf photosynthesis (AN) but their WUE values were not the highest. 收起