Effects of Foliar Redox Status on Leaf Vascular Organization Suggest Avenues for Cooptimization of Photosynthesis and Heat Tolerance

International Journal of Molecular Sciences
Jared J StewartBarbara Demmig-Adams

Abstract

The interaction of heat stress with internal signaling networks was investigated through Arabidopsisthaliana mutants that were deficient in either tocopherols (vte1 mutant) or non-photochemical fluorescence quenching (NPQ; npq1, npq4, and npq1 npq4 mutants). Leaves of both vte1 and npq1 npq4 mutants that developed at a high temperature exhibited a significantly different leaf vascular organization compared to wild-type Col-0. Both mutants had significantly smaller water conduits (tracheary elements) of the xylem, but the total apparent foliar water-transport capacity and intrinsic photosynthetic capacity were similarly high in mutants and wild-type Col-0. This was accomplished through a combination of more numerous (albeit narrower) water conduits per vein, and a significantly greater vein density in both mutants relative to wild-type Col-0. The similarity of the phenotypes of tocopherol-deficient and NPQ-deficient mutants suggests that leaf vasculature organization is modulated by the foliar redox state. These results are evaluated in the context of interactions between redox-signaling pathways and other key regulators of plant acclimation to growth temperature, such as the C-repeat binding factor (CBF) transcription factors, ...Continue Reading

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Citations

Apr 27, 2019·International Journal of Molecular Sciences·Nobuhiro Suzuki
Jul 20, 2019·The Biochemical Journal·Barbara Demmig-AdamsWilliam W Adams
Aug 14, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Barbara Demmig-AdamsWilliam W Adams

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Methods Mentioned

BETA
Fluorescence

Software Mentioned

- BLAST Tool
Primer
JMP Pro
ImageJ

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