Barbacenia graminifolia, a resurrection plant with high capacity of water retention
| Autor: | Danilo da Cruz Centeno, João Paulo Naldi Silva, Alex do Nascimento, Emerson Alves da Silva, Marcia R. Braga, Vanessa Fuentes Suguiyama, Rodrigo Fazani Esteves Sanches |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Ecology ved/biology Barbacenia ved/biology.organism_classification_rank.species Resurrection plant Plant Science Photosynthesis 010603 evolutionary biology 01 natural sciences Desiccation tolerance chemistry.chemical_compound Horticulture chemistry Chlorophyll Soil water Desiccation Water content Ecology Evolution Behavior and Systematics 010606 plant biology & botany |
| Zdroj: | Flora. 267:151604 |
| ISSN: | 0367-2530 |
| DOI: | 10.1016/j.flora.2020.151604 |
| Popis: | Desiccation tolerance (DT) in vegetative tissues is not a common ability, especially in Angiosperms. Barbacenia genus is distributed in tropical seasonally dry environments, such as rock outcrops, in South America. Some of the Barbacenia species are described as DT and are able to tolerate drastic water loss of their tissues during the desiccation process and to reestablish their metabolism after rehydration. In order to better understand this ability, we evaluated aspects related to leaf water status, gas exchange, photosynthetic pigments content and chlorophyll a fluorescence of B. graminifolia, during 32 days of water deprivation followed by rehydration. Carbon assimilation (A) remained active until the 24th day, when volumetric soil moisture was below 10%. Leaf relative water content (RWC) remained constant during 28 days of water withholding, decreasing significantly after this period, followed by the lowest gas exchange parameters and maximum quantum efficiency of photosystem II (Fv/Fm), and the highest degradation rates of chlorophyll and carotenoids in the course of the desiccation period. After rehydration, RWC was rapidly recovered, as well as Fv/Fm and photosynthetic parameters. This time frame was not enough for total recovery of A rates due, probably, to the slow restoration of chlorophyll a content. We classify, therefore, the species as a resurrection plant. Despite the similar decrease of photosynthetic rates found in other DT species before reaching the desiccated state, B. graminifolia maintains CO2 assimilation even under low soil water availability (10%) as physiological strategy when submitted to severe water deficit. |
| Databáze: | OpenAIRE |
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