Endocytosis against high turgor: intact guard cells of Vicia faba constitutively endocytose fluorescently labelled plasma membrane and GFP-tagged K-channel KAT1

The Plant Journal : for Cell and Molecular Biology
Tobias MeckelUlrike Homann

Abstract

The relevance of endocytosis in plants against high turgor pressure has frequently been questioned on the basis of energetic considerations. Here, we examine the dynamics of the plasma membrane (PM) in turgid guard cells of Vicia faba by monitoring with confocal microscopy the fate of fluorescent styryl dyes (FM1-43, FM2-10 and FM4-64). As a second marker, we also observe the retrieval of a fluorescent chimaera of the K(+)-inward rectifying channel from Arabidopsis thaliana and the green fluorescent protein (KAT1::GFP). Analysis of cytoplasmic structures, which became labelled by the different styryl dyes, revealed that only FM4-64, the most hydrophobic dye, was a reliable marker of endocytosis, whereas the two other styryl dyes resulted also in an unspecific labelling of different cytoplasmic structures including mitochondria. Over some minutes of incubation in continuous presence of these dyes, endocytic vesicles in the cortical cytoplasm beneath the PM were fluorescently labelled. The identification is based on the observation that the size distribution of these structures is very similar to that of endocytic vesicles obtained from patch-clamp capacitance recordings. Also, these structures are frequently co-labelled with KAT...Continue Reading

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Citations

Aug 27, 2013·Current Genetics·José Miguel MuletLynne Yenush
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