Effects of Postharvest Water Deficits on the Physiological Behavior of Early-Maturing Nectarine Trees.
Effects of Postharvest Water Deficits on the Physiological Behavior of Early-Maturing Nectarine Trees.
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DOI：
10.3390/plants9091104
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发表时间：
2020-08-27
期刊：
影响因子：
--
通讯作者：
Ruiz-Sánchez MC
中科院分区：
文献类型：
--
作者：
Conesa MR;Conejero W;Vera J;Ruiz-Sánchez MC
以早熟油桃为试材，研究了采后水分胁迫对早熟油桃的生理响应。采用了中度和重度两种亏缺灌溉处理，并与对照处理(充分灌溉)进行了比较。茎水势和叶片气体交换(净CO2同化率，ACO2；蒸腾速率，E；气孔导度，GS)被频繁地测量。避免干旱的机制包括气孔导度下降，特别是在严重亏缺处理的情况下，这也显示出ACO2对GS的强烈依赖。固有水分利用效率(ACO2/GS)比瞬时水分利用效率(ACO2/E)更能反映油桃的水分亏缺状况。然而，与其他落叶果树的结果相比，尽管E和GS之间存在重要的关系，但ACO2/E和ACO2/GS之间的相关性很差。ACO2/E与GS的相关性也很弱，但当包括蒸汽压亏缺(VPD)和GS作为自变量时，这种关系明显改善。这一事实表明，除了气孔关闭外，E还依赖于边界层电导(GB)，边界层电导由VPD通过风速变化来调节。这表明这种耐水物种的去耦合系数较低。
The physiological performance of early-maturing nectarine trees in response to water deficits was studied during the postharvest period. Two deficit irrigation treatments were applied, moderate and severe, and these were compared with a control treatment (fully irrigated). Stem water potential and leaf gas exchange (net CO2 assimilation rate, ACO2; transpiration rate, E; and stomatal conductance, gs) were measured frequently. Drought avoidance mechanisms included a decrease in stomatal conductance, especially in the case of the severe deficit treatment, which also showed a strong dependence of ACO2 on gs. Intrinsic water-use efficiency (ACO2/gs) was more sensitive than instantaneous water-use efficiency (ACO2/E) as an indicator to detect water deficit situations in nectarine trees. However, in contrast to the results obtained for other deciduous fruit trees, a poor correlation was found between ACO2/E and ACO2/gs, despite the important relation between E and gs. ACO2/E was also weakly correlated with gs, although this relationship clearly improved when the vapor pressure deficit (VPD) was included, along with gs as the independent variable. This fact reveals that apart from stomatal closure, E depends on the boundary layer conductance (gb), which is mediated by VPD through changes in wind speed. This suggests low values of the decoupling coefficient for this water-resilient species.
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影响因子：
6.7
作者：
Abrisqueta, I.;Vera, J.;Ruiz-Sanchez, M. C.
通讯作者：
Ruiz-Sanchez, M. C.
影响因子：
6.9
作者：
Galle A;Florez-Sarasa I;Aououad HE;Flexas J
通讯作者：
Flexas J
影响因子：
8.3
作者：
Abrisqueta, Isabel;Conejero, Wenceslao;Carmen Ruiz-Sanchez, Ma
通讯作者：
Carmen Ruiz-Sanchez, Ma
影响因子：
6.7
作者：
De la Rosa, J. M.;Domingo, R.;Perez-Pastor, A.
通讯作者：
Perez-Pastor, A.
影响因子：
6.1
作者：
Buendia, Begona;Allende, Ana;Gil, Maria I.
通讯作者：
Gil, Maria I.