Scalisi Alessio, O'Connell Mark Glenn, Stefanelli Dario, Lo Bianco Riccardo
Department of Agricultural, Food and Forest Sciences (SAAF), University of Palermo, Palermo, Italy.
Department of Jobs, Precincts and Regions, Agriculture Victoria, Tatura, VIC, Australia.
Front Plant Sci. 2019 Jul 3;10:805. doi: 10.3389/fpls.2019.00805. eCollection 2019.
Continuous assessment of plant water status indicators provides the most precise information for irrigation management and automation, as plants represent an interface between soil and atmosphere. This study investigated the relationship of plant water status to continuous fruit diameter (FD) and inverse leaf turgor pressure rates ( ) in nectarine trees [ (L.) Batsch] throughout fruit development. The influence of deficit irrigation treatments on stem ( ) and leaf water potential, leaf relative water content, leaf stomatal conductance, and fruit growth was studied across the stages of double-sigmoidal fruit development in 'September Bright' nectarines. Fruit relative growth rate (RGR) and leaf relative pressure change rate (RPCR) were derived from FD and to represent rates of water in- and outflows in the organs, respectively. Continuous RGR and RPCR dynamics were independently and jointly related to plant water status and environmental variables. The independent use of RGR and RPCR yielded significant associations with midday , the most representative index of tree water status in anisohydric species. However, a combination of nocturnal fruit and leaf parameters unveiled an even more significant relationship with , suggesting a changing behavior of fruit and leaf water flows in response to pronounced water deficit. In conclusion, we highlight the suitability of a dual-organ sensing approach for improved prediction of tree water status.
对植物水分状况指标进行连续评估可为灌溉管理和自动化提供最精确的信息，因为植物是土壤与大气之间的界面。本研究调查了油桃树[（L.）Batsch]在整个果实发育过程中植物水分状况与果实连续直径（FD）和叶片膨压变化率倒数（ ）之间的关系。研究了亏缺灌溉处理对‘九月光辉’油桃双S形果实发育各阶段茎（ ）和叶片水势、叶片相对含水量、叶片气孔导度及果实生长的影响。果实相对生长速率（RGR）和叶片相对压力变化率（RPCR）分别由FD和 得出，以代表器官中水分的流入和流出速率。连续的RGR和RPCR动态分别与植物水分状况和环境变量独立相关且共同相关。单独使用RGR和RPCR与午间 有显著关联， 是变水植物中树木水分状况最具代表性的指标。然而，夜间果实和叶片参数的组合揭示了与 更显著的关系，表明果实和叶片水分流动行为会因明显的水分亏缺而发生变化。总之，我们强调了双器官传感方法在改进树木水分状况预测方面的适用性。
