Abstract
Key message
Differential modulation of ROS content of the microenvironment (O ¯/MnTMPP/OH·) affects growth speed and morphology in lily pollen tubes. Oxygen radicals influence ionic zoning: membrane potential and pH gradients.
Abstract
Recently, redox-regulation of tip growth has been extensively studied, but differential sensitivity of growing cells to particular ROS and their subcellular localization is still unclear. Here, we used specific dyes to provide mapping of H2O2 and O·2¯ in short and long pollen tubes. We found apical accumulation of H2O2 and H2O2-producing organelles in the shank that were not colocalized with O·2¯-producing mitochondria. Differential modulation of ROS content of the germination medium affected both growth speed and pollen tube morphology. Oxygen radicals affected ionic zoning: membrane potential and pH gradients. OH· caused depolarization all along the tube while O·2¯ provoked hyperpolarization and cytoplasm alkalinization. O·2¯accelerated growth and reduced tube diameter, indicating that this ROS can be considered as pollen tube growth stimulator. Serious structural disturbances were observed upon exposure to OH· and ROS quencher MnTMPP: pollen tube growth slowed down and ballooned tips formed in both cases, but OH· affected membrane transport and organelle distribution as well. OH·, thus, can be considered as a negative regulator of pollen tube growth. Pollen tubes, in turn, are able to reduce OH· concentration, which was assessed by electron paramagnetic resonance spectroscopy (EPR).
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We would like to thank Pavel Breygin for assistance with the manuscript preparation.
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This work was supported by the Russian Science Foundation [19–74-00036].
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MB conceived and designed research, AP, EK and OL conducted experiments. AP and MB analyzed the data. MB wrote the manuscript. All authors read and approved the manuscript.
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Podolyan, A., Luneva, O., Klimenko, E. et al. Oxygen radicals and cytoplasm zoning in growing lily pollen tubes. Plant Reprod 34, 103–115 (2021). https://doi.org/10.1007/s00497-021-00403-6
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DOI: https://doi.org/10.1007/s00497-021-00403-6