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Mesophyll cells are the main site of abscisic acid biosynthesis in water-stressed leaves

McAdam, SAM ORCID: 0000-0002-9625-6750 and Brodribb, TJ ORCID: 0000-0002-4964-6107 2018 , 'Mesophyll cells are the main site of abscisic acid biosynthesis in water-stressed leaves' , Plant Physiology , pp. 1-21 , doi: 10.1104/pp.17.01829.

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he hormone abscisic acid (ABA) plays a critical role in enhancing plant survival during water deficit. Recent molecular evidence suggests that ABA is synthesized in the phloem companion cells and guard cells. However, the nature of cell turgor and water status in these two cell types cannot easily account for the rapid, water status-triggered ABA biosynthesis observed in leaves. Here we utilize the unique foliar anatomies of an angiosperm (Hakea lissosperma) and of four conifer species (Saxegothaea conspicua, Podocarpus latifolius, Cephalotaxus harringtonii, and Amentotaxus formosana) in which the mesophyll can be isolated from the vascular tissue to identify the main site of ABA biosynthesis in water-stressed leaves. In all five species tested, considerable ABA biosynthesis occurred in mesophyll tissue that had been separated from vascular tissue. In addition, the removal of the epidermis from the mesophyll in two conifer species had no impact on the observed increase in ABA levels under water deficit. Our results suggest that mesophyll cells are the predominant location of water deficit-triggered ABA biosynthesis in the leaf.

Item Type: Article
Authors/Creators:McAdam, SAM and Brodribb, TJ
Keywords: ABA biosynthesis occurs in the mesophyll
Journal or Publication Title: Plant Physiology
Publisher: Amer Soc Plant Biologists
ISSN: 0032-0889
DOI / ID Number: 10.1104/pp.17.01829
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© 2018 American Society of Plant Biologists. All rights reserved.

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