Abstract
Key message
Initial stomatal conductance at onset of illumination and lag times before stomata start to open in response to light are decisive for the whole course of photosynthetic induction. Neglecting these effects can reverse results when comparing induction parameters within and between species.
Abstract
We analyzed stomatal behaviors, the role of initial stomatal conductance (at onset of light, g ini), and contemporaneous effects on two types of photosynthetic induction, namely “overall” (stomatal and mesophyll effects included) and “biochemical induction” (mainly RuBisCO activity). Studies were performed in sun leaves of four species (Alnus glutinosa (L.) Gaertn., Betula pubescens Ehrh., Fagus sylvatica L., and Helianthus annuus L.) differing in shade-tolerance: A species-specific g ini-threshold, namely g ini(crit), was found, being decisive for time courses of induction. When g ini was above g ini(crit), induction half-times (t 50%) were reached within 5 min, almost completely independent of stomatal limitations, and both induction types did not differ between species. Large variations in t 50% (4–36 min) were observed when g ini < g ini(crit). These correlated linearly with lag times before onset of stomatal opening in response to light (t lag). t lag is generally the longer the lower g ini. Total overall and total biochemical induction correlated highly significantly with velocities of stomatal opening. Different induction times between species occurred as a result of stomatal behavior rather than photosynthetic parameters. Any induction process is initially more limited by the biochemical component. When g ini < g ini(crit), this biochemical limitation shifts towards stomata-dominated limitation at a lower induction state. Consequentially, stomata limit the induction process over most of the induction course. When g ini > g ini(crit) and stomata open fast, then induction is (almost) completely dominated by biochemical limitations and proceeds much faster. This study confirms the very important role of g ini(crit) in photosynthetic induction irrespective of species and discusses implications for modeling.
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Abbreviations
- Γ*:
-
Light-independent CO2 compensation point
- ΔA120 :
-
Increase of photosynthesis after 120 s of illumination (A–R D)
- Δw:
-
Leaf/air vapor concentration difference
- A :
-
Net photosynthesis
- A ind :
-
Overall photosynthetic induction
- A max :
-
Maximum A at full photosynthetic induction
- B ind :
-
Biochemical photosynthetic induction
- C a :
-
Ambient CO2 concentration
- C i :
-
Intercellular CO2 concentration
- g :
-
Stomatal conductance to H2O
- g c :
-
Cuticular conductance to H2O
- g ini :
-
g before illumination
- g l :
-
Leaf conductance to H2O
- g m :
-
Mesophyll conductance to CO2
- g max :
-
g at full induction
- IS120 :
-
Induction state after 120 s of illumination
- ISA=B :
-
Induction state at which A ind equals B ind
- m 100 :
-
Initial slope of the A/C i relationship at full induction
- PPFD:
-
Photosynthetic photon flux density
- R D :
-
Leaf respiration in darkness
- R I :
-
Leaf respiration in light
- RuBisCO:
-
Ribulose-1,5-bisphosphate carboxylase/oxygenase
- RuBP:
-
Ribulose-1,5-bisphosphate
- t :
-
Time
- t 50%A and t 90%A :
-
Time to reach 50% and 90% of A ind
- t 50%B and t 90%B :
-
Time to reach 50% and 90% of B ind
- t 90%g :
-
Time to reach 90% of g max
- t A=B :
-
Time to reach ISA=B
- t lag :
-
Lag time in stomatal response after beginning of illumination
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We thank Miko Kirschbaum (Palmerston North, New Zealand) and unknown reviewers for very helpful comments on an earlier version of the manuscript.
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Communicated by A. Gessler.
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Wachendorf, M., Küppers, M. The effect of initial stomatal opening on the dynamics of biochemical and overall photosynthetic induction. Trees 31, 981–995 (2017). https://doi.org/10.1007/s00468-017-1522-x
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DOI: https://doi.org/10.1007/s00468-017-1522-x