期刊
NEW PHYTOLOGIST
卷 231, 期 4, 页码 1415-1430出版社
WILEY
DOI: 10.1111/nph.17445
关键词
Anemia caffrorum; desiccation tolerance; hydraulic conductance; lipophilic antioxidants; photosynthesis; pigments; water relations
资金
- Ministerio de Economia y Competitividad (MINECO, Spain) [CTM2014-53902-C2-1-P]
- European Regional Development Fund (ERDF)
- Ministerio de Ciencia, Innovacion y Universidades (MCIU, Spain) [PGC2018-093824-B-C41/PGC2018-093824-B-C44]
- ERDF
- Basque Government (Spain) [UPV/EHU IT-1018-16]
- MINECO
- European Social Fund [BES-2015-072578]
- Ministerio de Educacion, Cultura y Deporte (MECD) [FPU-02054]
- Basque Government
- South African Department of Science and Innovation, National Research Foundation Research Chair [98406]
The fern Anemia caffrorum produces desiccation tolerant fronds in the dry season and desiccation sensitive fronds in the wet season. This allows for maximizing carbon gain during the rainy season and investing more in protective mechanisms during the hot dry season.
Desiccation tolerant plants can survive extreme water loss in their vegetative tissues. The fern Anemia caffrorum produces desiccation tolerant (DT) fronds in the dry season and desiccation sensitive (DS) fronds in the wet season, providing a unique opportunity to explore the physiological mechanisms associated with desiccation tolerance. Anemia caffrorum plants with either DT or DS fronds were acclimated in growth chambers. Photosynthesis, frond structure and anatomy, water relations and minimum conductance to water vapour were measured under well-watered conditions. Photosynthesis, hydraulics, frond pigments, antioxidants and abscisic acid contents were monitored under water deficit. A comparison between DT and DS fronds under well-watered conditions showed that the former presented higher leaf mass per area, minimum conductance, tissue elasticity and lower CO2 assimilation. Water deficit resulted in a similar induction of abscisic acid in both frond types, but DT fronds maintained higher stomatal conductance and upregulated more prominently lipophilic antioxidants. The seasonal alternation in production of DT and DS fronds in A. caffrorum represents a mechanism by which carbon gain can be maximized during the rainy season, and a greater investment in protective mechanisms occurs during the hot dry season, enabling the exploitation of episodic water availability.
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