Combined effects of irradiance and first autumn frost on CO2 assimilation and selected parameters of chlorophyll a fluorescence in Norway spruce shoots

Title:

Combined effects of irradiance and first autumn frost on CO2 assimilation and selected parameters of chlorophyll a fluorescence in Norway spruce shoots

Creator:

Kalina, J., Marek, M.V., and Špunda, V.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:4ac7733e-c201-4c76-8820-e0d921669f68
uuid:4ac7733e-c201-4c76-8820-e0d921669f68
urnnbn:urn:nbn:cz:aba007-000fkg

Type:

model:internalpart and TEXT

Format:

print

Description:

The state of some parameters of photosynthetic activity in Norway spruce (Picea abies [L.] Karst.) seedlings during the first autumn temperature transition to frost was monitored in October 1991. The trees were grown under field conditions of the Beskydy Mts. (North Moravia, The Czech Republic). Simultaneous measurements of Chi a fluorescence and C02 gas exchange revealed two phases in the functional transition of the assimilatory apparatus. Immediately upon the temperature transition to frost a distinct decrease in the radiant energy saturated rate of C02 uptake was observed and radiationless dissipation was indicated by higher values of the nonphotochemical quenching coefficient. The second period of the transition, a period with prolonged influence of frost together with a higher level of irradiance, was connected with a decrease of photosynthetic efficiency. The overwhelming capacity for protective non-photochemical energy dissipation and the complete reduction of acceptor QA occurred especially at medium and high incident irradiance documenting photoinhibitory damage to the photosynthetic apparatus.

Language:

Multiple languages

Rights:

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

Coverage:

233-242 and 75-84

Source:

Photosynthetica | 1994 Volume:30 | Number:2

Harvested from:

CDK

Metadata only:

false