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Phototropism pp 83-120 | Cite as

Quantitative Analysis of Tip Growth, Phototropic Responses, and Other Blue Light-Dependent Photoresponses of Vaucheria

  • Hironao Kataoka
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1924)

Abstract

The coenocytic tip-growing alga Vaucheria exhibits positive and negative phototropism, apical expansion, polarotropism, and branch induction from the illuminated region of the cell, all of which are caused by blue light. The bending response of Vaucheria is a blue light-mediated growth response. Differently from diffuse-growing cells or organs, the apical hemispherical dome of the Vaucheria cell is the site of not only maximum growth activity but also the site of blue light perception. Thence the phototropic response is initiated by the bulging mechanism: that is, a quick shift of the growth center to the adjacent subapical flank region. Since tip growth is driven by localized exocytosis, both phototropic bending and branch induction are considered to be closely related blue light-responses. Here I describe first how to prepare a highly useful culture medium for most freshwater algae, to establish unialgal and axenic culture of Vaucheria, and then describe several simple illumination systems using ordinary and/or inverted microscopes for the measurements of tip growth and for analyses of phototropism, polarotropism, and blue light-induced branching. Brief information is also included concerning the nature and function of aureochrome, the newly discovered, ochrophyte-specific blue light receptor. Aureochrome mediates blue light-induced branching, but its role in the phototropic response is still not elucidated.

Key words

Apical expansion Aureochrome Blue light Branching Ca2+ ion Coenocyte Light-growth response Negative phototropism Polarotropism Positive phototropism Split-field illumination method Unilateral illumination method Vaucheria 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Hironao Kataoka
    • 1
  1. 1.Botanical GardensTohoku UniversitySendaiJapan

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