Response of effective quantum yield of photosystem 2 to in situ temperature in three alpine plants

Title:

Response of effective quantum yield of photosystem 2 to in situ temperature in three alpine plants

Creator:

Braun, V. and Neuner, G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:69418783-781b-4078-86c0-0a3c5a3b3f78
uuid:69418783-781b-4078-86c0-0a3c5a3b3f78
issn:0300-3604
doi:10.1007/S11099-005-0020-3

Subject:

chlorophyll fluorescence induction, heat, Loiseleuria procumbens, photoinhibition, Saxifraga paniculata, Soldanella pusilla, and temperature optimum

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The response of effective quantum yield of photosystem 2 (ΔF/Fm') to temperature was investigated under field conditions (1 950 m a.s.l.) in three alpine plant species with contrasting leaf temperature climates. The in situ temperature response did not follow an optimum curve but under saturating irradiances [PPFD >800 µìmol(photon) m-2s-1] highest ΔF/Fm' occurred at leaf temperatures below 10°C. This was comparable to the temperature response of antarctic vascular plants. Leaf temperatures between 0 and 15°C were the most frequently (41 to 56%) experienced by the investigated species. At these temperatures, ΔF/Fm' was highest in all species (data from all irradiation classes included) but the species differed in the temperature at which ΔF/Fm' dropped below 50% (Soldanella pusilla >20°C, Loiseleuria procumbens >25°C, and Saxifraga paniculata >40°C). The in situ response of ΔF/Fm' showed significantly higher ΔF/Fm' values at saturating PPFD for the species growing in full sunlight (S. paniculata and L. procumbens) than for S. pusilla growing under more moderate PPFD. The effect of increasing PPFD on ΔF/Fm', for a given leaf temperature, was most pronounced in S. pusilla. Despite the broad diurnal leaf temperature amplitude of alpine environments, only in S. paniculata did saturating PPFD occur over a broad range of leaf temperatures (43 K). In the other two species it was half of that (around 20 K). This indicates that the setting of environmental scenarios (leaf temperature×PPFD) in laboratory experiments often likely exceeds the actual environmental demand in the field. and V. Braun, G. Neuner.

Language:

Multiple languages

Rights:

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

Coverage:

607-613

Source:

Photosynthetica | 2004 Volume:42 | Number:4

Harvested from:

CDK

Metadata only:

false