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首页> 外文会议>International Horticultural Congress on Science and Horticulture for People >Water Use Efficiency during Drought and Recovery in Grapevines: Differential Behaviour of Three Cultivars
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Water Use Efficiency during Drought and Recovery in Grapevines: Differential Behaviour of Three Cultivars

机译：葡萄园干旱和恢复过程中的用水效率：三种品种的差异行为

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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 established according to the leaf maximum daily gs to achieve severe water deficit conditions in the lapse of one week. The goal was to analyze how gs 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, gs 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 gs and gm limitations during acclimation to water stress changes from predominant gs early during water stress to similar gs and g_m after acclimation. Nonetheless during re-watering photosynthesis recovery was mostly limited by gs, since stomatal closure recovered much more slowly than gm. Water stress induced an increase in WUE, which interestingly persisted many days after rewatering. Kh_(Plant) variations during drought and recovery were in accordance with gs values. However, the relationship with gm 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 gs and leaf photosynthesis (AN) but their WUE values were not the highest.
机译：在Mallorca（西班牙）生长的“格良”，“锡拉”和“霞多丽”品种的盆栽葡萄和恢复下的水利用效率（WUE）对水使用效率（WUE）进行了比较研究。根据叶片最大每日GS建立赤字灌溉，以在一周内实现严重的水赤字条件。目标是分析GS在水分压力和恢复下对GS调节的调节方式，以及水分应力如何影响叶子和整个植物水平的WUE调整。在整个实验中每天记录土壤含水量，气候条件，叶片光合作用，蒸腾，GS和叶片电导（G_M）。水关系和植物液压导率（KH_（植物））在五个特定的采样天中进行：第一次实现所需气孔导度（50mmol m〜（-2）s〜（-1）的日（第0天） ，在恒定土壤水分维持植物后七天，再浇水（第7天），然后在重新浇水后1,2和7天。 GS和GM限制在适应于水胁迫期间的相对贡献在水胁迫期间从占优势Gs改变到相似的GS和G_M。尽管如此，在再浇水的光合作用期间，恢复大部分受到GS的限制，因为气孔闭合恢复得多比gm慢。水分压力诱导了Wue的增加，这有趣地持续在再次水后持续。干旱和恢复过程中的KH_（植物）变化符合GS值。然而，与GM变化的关系较低。 'Chardonnay'显示水分压力和灌溉植物之间的最大差异以及最低的叶水潜力。在干旱和恢复下，该品种保持较低的GS和叶片光合作用（AN），但其WUE值并不是最高的。

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