Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 71, Issue 20, Pages 6460-6470Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eraa328
Keywords
Capacitance; cell wall; CO2 assimilation; desiccation; hydric strategy; modulus of elasticity; non-vascular plants; photosynthetic capacity; stomatal regulation
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Funding
- Ministerio de Educacion, Cultura y Deporte (MECD), Spain [FPU-02054]
- Ministerio de Economia y Competitividad (MINECO), Spain [BES-2015-072578]
- European Social Fund (ESF)
- Agencia Estatal de Investigacion (AEI) of the Ministerio de Ciencia, Innovacion y Universidades (MICIU) [PGC2018-093824-B-C41]
- European Regional Development Fund (ERDF/FEDER) of the European Union (EU/UE)
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In vascular plants, more rigid leaves have been linked to lower photosynthetic capacity, associated with low CO2 diffusion across the mesophyll, indirectly resulting in a trade-off between photosynthetic capacity (A(n)) and bulk modulus of elasticity (epsilon). However, we evaluated mosses, liverworts, and Chara sp., plus some lycophytes and ferns, and found that they behaved as clear outliers of the A(n)-epsilon relationship. Despite this finding, when vascular and non-vascular plants were plotted together, epsilon still linearly determined the cessation of net photosynthesis during desiccation both in species with stomata (either actively or hydro-passively regulated) and in species lacking stomata, and regardless of their leaf structure. The latter result challenges our current view of photosynthetic responses to desiccation and/or water stress. Structural features and hydric strategy are discussed as possible explanations for the deviation of these species from the A(n)-epsilon trade-off, as well as for the general linear dependency between e and the full cessation of An during desiccation.
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