Abstract
The localization of cell wall polysaccharides of the fused petals of monocotyledonous Sandersonia aurantiaca flowers has been identified using antibodies directed to pectin and xyloglucan epitopes and detection by fluorescence microscopy. Cross sections of the petal tissue were taken from cut flowers in bud and at various stages of maturity and senescence. Patterns of esterification in pectin backbones were identified by JIM5 and 2F4 labelling. Pectic galactan and arabinan side branches were detected by LM5 and LM6, respectively, while fucosylated xyloglucan was identified by CCRC-M1. The labelling patterns highlighted compositional differences between walls of the outer/inner epidermis compared to the spongy parenchyma cells of the interior mesophyll for fucosylated xyloglucan and arabinan. Partially esterified homogalacturonan was present in the junction zones of the outer epidermis and points of contact between cells of the mesophyll, and persisted throughout senescence. Pectic galactans were ubiquitous in the outer and inner epidermal cell walls and walls of the interior mesophyll at flower opening, whereas pectic arabinan was found predominantly in the epidermal cells. Galactan was lost from walls of all cells as flowers began to senesce, while fucosylated xyloglucan appeared to increase over this time. Such differences in the location of polysaccharides and the timing of changes suggest distinct combinations of certain polysaccharides offer mechanical and rheological advantages that may assist with flower opening and senescence.
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O’Donoghue, E.M., Sutherland, P.W. Cell wall polysaccharide distribution in Sandersonia aurantiaca flowers using immuno-detection. Protoplasma 249, 843–849 (2012). https://doi.org/10.1007/s00709-011-0307-0
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DOI: https://doi.org/10.1007/s00709-011-0307-0