Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration

Title:

Photosynthetic response of poikilochlorophyllous desiccation-tolerant Pleurostima purpurea (Velloziaceae) to dehydration and rehydration

Creator:

Aidar, S. T., Meirelles, S. T., Oliveira, R. F., Chaves, A. R. M., and Fernandes-Júnior, P. I.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:d9f1b90b-77d3-48e3-97c1-820667b3a425
uuid:d9f1b90b-77d3-48e3-97c1-820667b3a425
issn:0300-3604
doi:10.1007/s11099-014-0014-0

Subject:

fotosyntéza, photosynthesis, chlorophyll fluorescence, gas exchange, photoprotective mechanisms, vegetative desiccation tolerance, Pleurostima purpurea, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

The poikilochorophyllous, desiccation-tolerant (PDT) angiosperm, Pleurostima purpurea, normally occurs in less exposed rock faces and slightly shady sites. Our aim was to evaluate the light susceptibility of the photosynthetic apparatus during dehydration-rehydration cycle in P. purpurea. In a controlled environment, the potted plants were subjected to water deficit under two different photosynthetic photon flux densities [PPFD, 100 and 400 μmol(photon) m-2 s-1]. In the higher PPFD, net photosynthetic rate (PN) become undetectable after stomata closure but photochemical efficiency of photosystem II, electron transport rate, and photochemical quenching coefficient were maintained relatively high, despite a partial decrease. The photochemical activity was inhibited only after the complete loss of chlorophylls, when leaf relative water content dropped below 72% and total carotenoids reached maximal accumulation. Nonphotochemical energy dissipation increased earlier in response to dehydration under higher PPFD. PN and photochemical activity were fully recovered after rehydration under both light treatments. Our results suggested that the natural occurrence of P. purpurea should not be restricted by the light intensity during the complete desiccation-rehydration cycles., S. T. Aidar, S.T. Meirelles, R. F. Oliveira, A. R. M. Chaves, P. I. Fernandes-Júnior., and Obsahuje bibliografii

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

124-133

Source:

Photosynthetica | 2014 Volume:52 | Number:1

Harvested from:

CDK

Metadata only:

false