ArticlePhysiologia plantarum
Modelling photosynthetic responses by day and night during initial water stress in Pulmonaria vallarsae.
Article in Physiologia plantarum. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Modelling photosynthetic responses by day and night during initial water stress in Pulmonaria vallarsae.Physiologia plantarumArticle
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4 authors.
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Abstract
The relationships between photosynthesis and initial water deficit stress were investigated by chlorophyll fluorescence analysis in Pulmonaria vallarsae, a shade tolerant, perennial C3 herb by following changes of light response curves (LRCs) in single leaves during water shortage. We devised an LRC model based on two interacting rectangular hyperbolae (DH model) for the low (H1) and the high irradiance regions (H2), characterized by two parameters: maximum extrapolated ETR (V1, V2) and half-saturation irradiance (K1, K2). While H1 is assumed to represent an ETR-related function, H2 may reflect Rubisco activity. Plants were subjected to four days of water restriction in summer and tested every 12 h. While daytime values remained relatively stable, increasing water stress gradually induced a night depression of photosynthesis mainly dependent on decreasing ETR with concomitant reduction of PSII-dependent parameters (Φ
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