Soil water-holding capacity mediates hydraulic and hormonal signals of near-isohydric and near-anisohydric Vitis cultivars in potted grapevines.
Soil water-holding capacity mediates hydraulic and hormonal signals of near-isohydric and near-anisohydric Vitis cultivars in potted grapevines.
复制标题
土壤持水能力介导盆栽葡萄藤中近等水和近非等水葡萄品种的水力和激素信号。
作者：
S. Tramontini;J. Döring;M. Vitali;A. Ferrandino;M. Stoll;C. Lovisolo
葡萄藤（葡萄属vinifera L.）表现出不同的反应，水分胁迫，不仅取决于基因型，但也对葡萄园的生长条件或季节性的影响。我们的目的是分析两个葡萄藤品种生长在两种土壤上的干旱反应的影响，一个排水（WD）含有80%的砂体积，另一个保水（WR），没有砂。在这两种不同持水量下，对水分胁迫表现出近等水分反应的西拉和对水分胁迫表现出近等水分反应的赤霞珠进行盆栽试验。木质部栓塞有助于植物适应土壤水分剥夺：在这两个品种在后期阶段的水分胁迫，但是，在西拉，已经在中度早期应力水平。相比之下，西拉表现出较不有效的气孔控制干旱比赤霞珠。脱落酸（阿坝）对两种盆栽土壤上赤霞珠葡萄的气孔导度均有显著影响。在近anisohydric品种西拉ABA相关的气孔关闭诱导在WR土壤中保持高水平的水势，表明土壤相关的激素根到芽信号导致气孔关闭叠加在puestival品种诱导anisohydric响应水分胁迫。
Grapevine (Vitis vinifera L.) expresses different responses to water stress, depending not only on genotype, but also on the influence of vineyard growing conditions or seasonality. Our aim was to analyse the effects on drought response of two grapevine cultivars growing on two soils, one water draining (WD) containing sand 80% volume and the other water retaining (WR), with no sand. Under these two different water-holding capacities Syrah, displaying a near-anisohydric response to water stress, and Cabernet Sauvignon (on the contrary, near-isohydric) were submitted to water stress in a pot trial. Xylem embolism contributed to plant adaptation to soil water deprivation: in both cultivars during late phases of water stress, however, in Syrah, already at moderate early stress levels. By contrast, Syrah showed a less effective stomatal control of drought than Cabernet Sauvignon. The abscisic acid (ABA) influenced tightly the stomatal conductance of Cabernet Sauvignon on both pot soils. In the near-anisohydric variety Syrah an ABA-related stomatal closure was induced in WR soil to maintain high levels of water potential, showing that a soil-related hormonal root-to-shoot signal causing stomatal closure superimposes on the putatively variety-induced anisohydric response to water stress.
影响因子：
6.9
作者：
Andrew Peter Whitmore;W. Richard Whalley
通讯作者：
Andrew Peter Whitmore;W. Richard Whalley