Article Dans Une Revue Physiologia Plantarum Année : 2025

Estimation of light utilisation and antioxidative protection in an alpine plant species ( Soldanella alpina L.) during the leaf life cycle at high elevation

Résumé

Photosynthesis, electron transport to carbon assimilation, photorespiration and alternative electron transport, light absorption of the two photosystems, antioxidative protection and pigment contents were investigated in S. alpina leaves. S. alpina is an alpine snow‐bed plant which can be found with green leaves after snowmelt. At least 24% of the leaves were formed at the beginning of the vegetation period in the previous year and survived two consecutive vegetation periods under contrasting environmental conditions. In leaves still covered by snow (SNOW), the parameters of antioxidative protection and carbon assimilation were lower than in leaves from the previous vegetation period (NEW) or several weeks after snowmelt (OLD). Directly after snowmelt, antioxidative protection was strongly but transitionally increased. The senescence of leaves did not depend on antioxidative scavenging capacity. Lower carbon assimilation was not related to increases in alternative electron flow (ETR alt ) in SNOW leaves. In the second vegetation period, light absorption by PSII decreases in favour of PSI in OLD leaves. This allows OLD leaves to keep the electron transport chain more oxidised and to support photorespiration with increased ATP synthesis by cyclic electron transport around PSI. This study describes how the leaves of a unique plant can cope with contrasting environmental conditions.

Fichier principal
Vignette du fichier
Streb_2024_PMID_39821193.pdf (4.01 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Licence

Dates et versions

hal-05374349 , version 1 (20-11-2025)

Licence

Identifiants

Citer

Peter Streb, Philippine Dubertrand, Gabriel Cornic, Kamel Soudani, Giovanni Finazzi. Estimation of light utilisation and antioxidative protection in an alpine plant species ( Soldanella alpina L.) during the leaf life cycle at high elevation. Physiologia Plantarum, 2025, 177 (1), pp.e70045. ⟨10.1111/ppl.70045⟩. ⟨hal-05374349⟩
199 Consultations
57 Téléchargements

Altmetric

Partager

  • More