Influence of salinity on Na+ and K+ accumulation, and gas exchange in Avicennia germinans

Title:

Influence of salinity on Na+ and K+ accumulation, and gas exchange in Avicennia germinans

Creator:

Suárez, N. and Medina, E.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:4a3f64d6-494a-4bc9-bb81-88032cba4488
uuid:4a3f64d6-494a-4bc9-bb81-88032cba4488
issn:0300-3604
doi:10.1007/s11099-006-0018-5

Subject:

growth, leaf water relations, net photosynthetic rate, potassium, and stomatal conductance

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We analysed plant growth, ion accumulation, leaf water relations, and gas exchange of Avicennia germinans (L.) L. subjected to a long-term, controlled salinity gradient from 0 to 55 ‰. Growth and leaf area were affected by salinity higher than 10 ‰. As salinity increased, the predawn leaf water potential (Ψw) and leaf osmotic potential (Ψs) decreased. Leaf Ψw was at least -0.32 MPa lower than the Ψw of solution. Na+ and K+ ions explained about 78 % of decrease in Ψs. K+ tissue water concentration decreased by more than 60 % in all salinity treatments as compared with those grown at 0 ‰. Inversely, Na+ concentration in tissue water increased with nutrient solution salinity. The maximum net photosynthetic rate (PN) and stomatal conductance (gs) decreased by 68 and 82 %, respectively, as salinity increased from 0 to 55 ‰; the intercellular CO2 concentration (Ci) followed the same trend. The PN as a function of Ci showed that both the initial linear slope and upper plateau of the PN vs. Ci curve were markedly affected by high salinity (40 and 55 ‰). and N. Suárez, E. Medina.

Language:

Multiple languages

Rights:

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

Coverage:

268-274

Source:

Photosynthetica | 2006 Volume:44 | Number:2

Harvested from:

CDK

Metadata only:

false