Green leaf volatile sensory calcium transduction in Arabidopsis

Yuri Aratani, Takuya Uemura, Takuma Hagihara, Kenji Matsui and Masatsugu Toyota ()
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Yuri Aratani: Saitama University
Takuya Uemura: Saitama University
Takuma Hagihara: Saitama University
Kenji Matsui: Yamaguchi University
Masatsugu Toyota: Saitama University

Nature Communications, 2023, vol. 14, issue 1, 1-16

Abstract: Abstract Plants perceive volatile organic compounds (VOCs) released by mechanically- or herbivore-damaged neighboring plants and induce various defense responses. Such interplant communication protects plants from environmental threats. However, the spatiotemporal dynamics of VOC sensory transduction in plants remain largely unknown. Using a wide-field real-time imaging method, we visualize an increase in cytosolic Ca2+ concentration ([Ca2+]cyt) in Arabidopsis leaves following exposure to VOCs emitted by injured plants. We identify two green leaf volatiles (GLVs), (Z)-3-hexenal (Z-3-HAL) and (E)-2-hexenal (E-2-HAL), which increase [Ca2+]cyt in Arabidopsis. These volatiles trigger the expression of biotic and abiotic stress-responsive genes in a Ca2+-dependent manner. Tissue-specific high-resolution Ca2+ imaging and stomatal mutant analysis reveal that [Ca2+]cyt increases instantly in guard cells and subsequently in mesophyll cells upon Z-3-HAL exposure. These results suggest that GLVs in the atmosphere are rapidly taken up by the inner tissues via stomata, leading to [Ca2+]cyt increases and subsequent defense responses in Arabidopsis leaves.

Date: 2023
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DOI: 10.1038/s41467-023-41589-9

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