Similar susceptibility to excess irradiance in sun and shade acclimated saplings of Norway spruce [Picea abies (L.) Karst.] and stone pine (Pinus cembra L.)

Title:

Similar susceptibility to excess irradiance in sun and shade acclimated saplings of Norway spruce [Picea abies (L.) Karst.] and stone pine (Pinus cembra L.)

Creator:

Gamper, R., Mayr, S., and Bauer, H.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:6de74466-2bc8-4ce4-9431-222f6d60ad27
uuid:6de74466-2bc8-4ce4-9431-222f6d60ad27
issn:0300-3604
doi:10.1023/A:1010965319054

Subject:

chlorophyll fluorescence, frost hardening, low temperature, and net photosynthetic rate

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

We compared the responses of sun and shade acclimated saplings of Picea abies and Pinus cembra to excess photosynthetic photon flux density (PPFD) equivalently exceeding the level for saturating net photosynthetic rate (PN). Exposure for 2 h up to 2000 µmol(photon) m-2 s-1 did not affect radiant energy saturated PN. Photoinhibition of photosynthesis was indicated by a small (10 %) reduction of the potential efficiency of photosystem 2 as derived from measurements of chlorophyll fluorescence (FV/FM). However, the extent of FV/FM reduction and half-time for recovery were similar in sun and shade acclimated saplings of both species. Furthermore, the effect on FV/FM was not stronger when the plants were exposed to excess PPFD at 5 °C instead of 15 °C. Frost-hardening of plants increased slightly their resistance to excess PPFD. Establishment of these conifer saplings usually acclimated to shade in their natural habitat may hardly be endangered by a sudden increase of PPFD, e.g., by gap formation. and R. Gamper, S. Mayr, H. Bauer.

Language:

Multiple languages

Rights:

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

Coverage:

373-378

Source:

Photosynthetica | 2000 Volume:38 | Number:3

Harvested from:

CDK

Metadata only:

false