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Spatial heterogeneity of flesh-cell osmotic potential in sweet cherry affects partitioning of absorbed water

查看全文 作　　者：Eckhard [1]Grimm;Daniel [2]Pflugfelder;Jan [3]Hahn;Moritz Jonathan [1]Schmidt;Hendrik [1]Dieckmann;Moritz [1]Knoche 高影响力作者 机构地区：[1]Institut für Gartenbauliche Produktionssysteme,Leibniz Universität Hannover,Abteilung Obstbau,Herrenhäuser Straße 2,D-30419 Hannover,Germany;[2]Forschungszentrum Jülich,IBG-2:Pflanzenwissenschaften,Wilhelm-Johnen-Straße,D-52428 Jülich,Germany;[3]Laser Zentrum Hannover e.V.,Hollerithallee 8,D-30419 Hannover,Germany高影响力机构 出　　处：《Horticulture Research》索引2020年第7卷第1期,共10页高影响力期刊 基　　金：financed by the Open Access Fund of the Leibniz Universität Hannover. 摘　　要：A fleshy fruit is commonly assumed to resemble a thin-walled pressure vessel containing a homogenous carbohydrate solution.Using sweet cherry(Prunus avium L.)as a model system,we investigate how local differences in cell water potential affect H2O and D2O(heavy water)partitioning.The partitioning of H2O and D2O was mapped nondestructively using magnetic resonance imaging(MRI).The change in size of mesocarp cells due to water movement was monitored by optical coherence tomography(OCT,non-destructive).Osmotic potential was mapped using microosmometry(destructive).Virtual sections through the fruit revealed that the H2O distribution followed a net pattern in the outer mesocarp and a radial pattern in the inner mesocarp.These patterns align with the disposition of the vascular bundles.D2O uptake through the skin paralleled the acropetal gradient in cell osmotic potential gradient(from less negative to more negative).Cells in the vicinity of a vascular bundle were of more negative osmotic potential than cells more distant from a vascular bundle.OCT revealed net H2O uptake was the result of some cells loosing volume and other cells increasing volume.H2O and D2O partitioning following uptake is non-uniform and related to the spatial heterogeneity in the osmotic potential of mesocarp cells. 关 键 词：POTENTIAL SPATIAL BUNDLE
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