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Stomatal Responses to Humic Substances and Auxin are Sensitive to Inhibitors of Phospholipase A2

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Abstract

Two fractions of earthworm humic substances, differing in nominal molecular weight, containing a very low amount of free IAA, and exhibiting auxin-like properties, were prepared and characterised by infrared and 1H-NMR spectroscopy. In this study we investigate their effects on stomatal opening, as influenced by phospholipase A2, in leaf of the Argenteum mutant of pea (Pisum sativum L.) Both of the humic fractions caused stomatal opening in the epidermal peels. The response showed a broad biphasic dose dependence and the effective concentrations were similar for the two fractions. The maximal stomatal apertures in response to both humic substances were similar to that caused by IAA and somewhat less than the response to white light or fusicoccin. Two inhibitors of phospholipase A2 selectively blocked the response of stomata to both IAA and humic substances, without affecting the response to light or fusicoccin. We conclude that stomatal opening in response to auxin and humic substances involves activation of a phospholipase A2 that is not involved in signalling the response to light or fusicoccin.

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  1. Angela R Stokes

    Present address: School of Biological Sciences, University of East Anglia, NR4 7TJ, Norwich, UK

Authors and Affiliations

  1. Centre for Research in Plant Science, University of the West of England, Coldharbour Lane, BS16 1QY, Bristol, UK

    Laurel Russell, Angela R Stokes & Heather Macdonald

  2. Dipartimento di Gestione dei Sistemi Agricoli e Forestali, Facoltà di Agraria, Università degli Studi “Mediterranea” di Reggio Calabria, località Feo di Vito, 89060, Reggio Calabria, Italy

    Adele Muscolo

  3. Dipartimento di Biotecnologie Agrarie, Agripolis, Università di Padova, Viale dell’Università 16, I-35020, Legnaro Padova, Italy

    Serenella Nardi

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  1. Laurel Russell
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  2. Angela R Stokes
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Correspondence to Heather Macdonald.

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Russell, L., Stokes, A.R., Macdonald, H. et al. Stomatal Responses to Humic Substances and Auxin are Sensitive to Inhibitors of Phospholipase A2 . Plant Soil 283, 175–185 (2006). https://doi.org/10.1007/s11104-006-0011-6

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