Modifications in photosynthetic pigments and chlorophyll fluorescence in 20-year-old pine trees after a four-year exposure to carbon dioxide and temperature elevation

Title:

Modifications in photosynthetic pigments and chlorophyll fluorescence in 20-year-old pine trees after a four-year exposure to carbon dioxide and temperature elevation

Creator:

Wang, K.-Y., Kellomäki, S., and Zha, T.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:29e33a9f-4916-41ca-9589-30eba6cd80d6
uuid:29e33a9f-4916-41ca-9589-30eba6cd80d6
issn:0300-3604
doi:10.1023/B:PHOT.0000011948.00870.db

Subject:

carotenoids, diurnal course, environment chambers, irradiance, leaf temperature, photosynthetic photon flux density, photosystem 2, Pinus sylvestris, and specific leaf area

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Changes in pigment composition and chlorophyll (Chl) fluorescence parameters were studied in 20 year-old Scots pine (Pinus sylvestris L.) trees grown in environment-controlled chambers and subjected to ambient conditions (CON), doubled ambient CO2 concentration (EC), elevated temperature (ambient +2-6 °C, ET), or a combination of EC and ET (ECT) for four years. EC did not significantly alter the optimal photochemical efficiency of photosystem 2 (PS2; Fv/Fm), or Chl a+b content during the main growth season (days 150-240) but it reduced Fv/Fm and the Chl a+b content and increased the ratio of total carotenoids to Chl a+b during the 'off season'. By contrast, ET significantly enhanced the efficiency of PS2 in terms of increases in Fv/Fm and Chl a+b content throughout the year, but with more pronounced enhancement in the 'off season'. The reduction in Fv/Fm during autumn could be associated with the CO2-induced earlier yellowing of the leaves, whereas the temperature-stimulated increase in the photochemical efficiency of PS2 during the 'off season' could be attributed to the maintenance of a high sink capacity. The pigment and fluorescence responses in the case of ECT showed a similar pattern to that for ET, implying the importance of the temperature factor in future climate changes in the boreal zone. and K. Y. Wang, S. Kellomäki, T. Zha.

Language:

Multiple languages

Rights:

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

Coverage:

167-175

Source:

Photosynthetica | 2003 Volume:41 | Number:2

Harvested from:

CDK

Metadata only:

false