Regulated deficit irrigation in different phenological stages of potted geranium plants: water consumption, water relations and ornamental quality
Regulated deficit irrigation in different phenological stages of potted geranium plants: water consumption, water relations and ornamental quality
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DOI：
10.1007/s11738-012-1165-x
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发表时间：
2013-04-01
影响因子：
2.6
通讯作者：
Jesus Sanchez-Blanco, M.
中科院分区：
文献类型：
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作者：
Alvarez, Sara;Banon, Sebastian;Jesus Sanchez-Blanco, M.
观赏植物的灌溉需水量和对水分亏缺的敏感性是园艺生产者制定灌溉策略的重要依据。研究了不同亏缺灌溉策略对萌发植物不同生长阶段生理和形态参数的影响，以评估如何安全地使用这些策略，并确定开花期是否对亏缺灌溉敏感。天竺葵使在受控生长室中生长的Bailey植物经受四种灌溉处理：对照（在整个实验中为100%的水田容量）、可持续的亏缺灌溉（在整个实验中为75%的水田容量）和两种调节的亏缺灌溉处理，所述调节的亏缺灌溉处理包括在营养生长阶段期间或在开花发育阶段期间的水分胁迫。虽然三个亏缺灌溉处理的灌溉水量总量相似（约为对照值的80%），但在开花期间进行亏缺灌溉时，高度和开花的值均最低。这表明，植物质量不仅取决于施水量，而且取决于减少施水量的时间，开花期是对水分胁迫最敏感的时期。蒸散量与花序的形成和植株高度的增加有关。当灌溉策略改变，植物增加或减少其耗水量和气孔导度，以适应新的条件下，通过调节气孔开放，虽然，在一般情况下，这两个参数的值仍然低于在对照植物中观察到的。
The irrigation water requirements and sensitivity to water deficits of ornamental plants is of great interest to horticultural producers for planning irrigation strategies. The effect of different deficit irrigation strategies on physiological and morphological parameters in geranium plants was studied in different growth phases to evaluate how such strategies can be safely used and to ascertain whether the flowering phase is sensitive to deficit irrigation. Pelargonium x hortorum L.H. Bailey plants, grown in a controlled growth chamber, were subjected to four irrigation treatments: control (100 % water field capacity throughout the experiment), sustainable deficit irrigation (75 % water field capacity throughout the experiment), and two regulated deficit irrigation treatments that included water stress during the vegetative growth phase or during the flowering development phase. Although the total amount of irrigation water was similar in the three deficit irrigation treatments (around 80 % of the control value), the lowest values for both height and flowering were found when deficit irrigation was applied during flowering. This indicates that plant quality does not only depend on the amount of water applied but also on the time when the reduction is applied, and that flowering is the most sensitive phase to water stress. Evapotranspiration was related to the formation of inflorescences and to increased plant height. When the irrigation strategy was changed, plants increased or decreased their water consumption and stomatal conductance to adjust to the new conditions by regulating stomatal opening, although, in general, the values of both parameters remained below those observed in the control plants.