Photosynthetic adaptation and survival strategy of Duvalia velutina in an extremely arid environment

Title:

Photosynthetic adaptation and survival strategy of Duvalia velutina in an extremely arid environment

Creator:

Masrahi, Y. S., Al-Turki, T. A., and Sayed, O. H.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:24669ae5-da9c-45a3-a661-abea47b70cfb
uuid:24669ae5-da9c-45a3-a661-abea47b70cfb
issn:0300-3604
doi:10.1007/s11099-015-0143-0

Subject:

fotosyntéza, photosynthesis, chlorophyll fluorescence, CAM, CAM-idling, drought, Duvalia velutina, nurse association, photoprotection, 2, and 581

Type:

model:article and TEXT

Format:

print, bez média, and svazek

Description:

Leafless Duvalia velutina Lavranos (Apocynaceae) is an arido-active stem succulent common in the arid region southwest of the Arabian Peninsula. This region is characterized by a short wet season with erratic rainfall and a long dry season with high temperature and high irradiance. We investigated the survival strategy of D. velutina by studying nurse association, gas exchange, and chlorophyll fluorescence. Results showed that D. velutina exhibited the strict nurse association with shade for protection against heat and high irradiance. Results also showed that D. velutina is an obligate CAM plant with ample physiotypic plasticity involving a shift to CAM-idling under prolonged drought. Chlorophyll fluorescence measurements revealed water stress-induced reduction of PSII activity occurring in concomitance with a marked rise of nonphotochemical quenching and chlorenchyma anthocyanin content. These results reflected photoprotective capacity involving nonradiative excess energy dissipation and antioxidative attributes. We concluded that the complex survival strategy of D. velutina in its natural arid habitat includes a multifaceted interplay of nurse association, physiotypic plasticity, and photoprotective mechanisms., Y. S. Masrahi, T. A. Al-Turki, O. H. Sayed., and Obsahuje seznam literatury

Language:

Multiple languages

Rights:

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

Coverage:

555-561

Source:

Photosynthetica | 2015 Volume:53 | Number:4

Harvested from:

CDK

Metadata only:

false