Differentiation of Glandular Cavities in the Vascular Bundles of Developing Peach Fruit

Several complex physiological processes, which include long-distance translocation in the phloem and unloading in sink tissues, govern the partitioning of sugars in economically important organs, such as peach fruit. In this study, we took advantage of a symplastic tracer, carboxyfluorescein (CF), providing evidence for an apoplastic sucrose transfer in the early (SI) and middle (SIII) phases of peach fruit development. Moreover, using a combination of in situ hybridization and laser microdissection-assisted expression analysis, three putative sucrose transporters encoding genes (PpSUT1, PpSUT2, PpSUT4) were transcriptionally analyzed to relate their expression with sucrose storage in this organ. Our study revealed that PpSUT2 and PpSUT4 are the genes predominantly expressed in fruit flesh, and the detailed analysis of their expression pattern in the different cell types enabled us to suggest a specialized role in sucrose distribution. Both PpSUTs transporters could be involved in the retrieval of sucrose lost from the symplastic continuum of the phloem and, when expressed in parenchyma cells, they could be active in the import of sucrose into sink tissues, via symport from the apoplast. An alternative hypothesis has been proposed and discussed for PpSUT4 because of its putative tonoplastic localization. Taken together, our results provide new insights into the molecular mechanisms underpinning sucrose unloading and accumulation in peach fruit.

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“…2C, D). This structure was previously described by other authors (Masia et al 1992, Nii et al 2005, Liu et al 2010) as a glandular cavity. Fig.…”

Section: Structural Studies Of Fruit Mesocarpmentioning

confidence: 71%

Sucrose transport and phloem unloading in peach fruit: potential role of two transporters localized in different cell types

Zanon

Falchi

Santi

et al. 2014

Physiologia Plantarum

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“…Focussing on the mesocarp, middle cell layers of carpel undergo divisions, subsequently they expand and differentiate into parenchyma and collenchyma types [4,5]. Moreover, the pre-existing vascular bundles develop into a complex net and extend into the flesh due to the procambium activation and cell division [2,11,13].…”

Section: Introductionmentioning

confidence: 99%

The KNOTTED-like genes of peach (Prunus persica L. Batsch) are differentially expressed during drupe growth and the class 1 KNOPE1 contributes to mesocarp development

et al. 2015

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Peach fruit suture softening regulated by the interaction of nitrogen with cytokinin and ethylene

Liu

Zhang

et al. 2010

Scientia Horticulturae

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Differentiation of Glandular Cavities in the Vascular Bundles of Developing Peach Fruit

Cited by 4 publications

References 2 publications

Sucrose transport and phloem unloading in peach fruit: potential role of two transporters localized in different cell types

Sucrose transport and phloem unloading in peach fruit: potential role of two transporters localized in different cell types

The KNOTTED-like genes of peach (Prunus persica L. Batsch) are differentially expressed during drupe growth and the class 1 KNOPE1 contributes to mesocarp development

Peach fruit suture softening regulated by the interaction of nitrogen with cytokinin and ethylene

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