Elevated CO2 and temperature differentially affect photosynthesis and resource allocation in flag and penultimate leaves of wheat

Differences in acclimation to elevated growth CO2 (700 µmol mol−1, EC) and elevated temperature (ambient +4 °C, ET) in successive leaves of wheat were investigated in field chambers. At a common measurement CO2, EC increased photosynthesis and the quantum yield of electron transport (Φ) early on in...

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Bibliographic Details
Published in:Photosynthetica 2007-01, Vol.45 (1), p.9-17
Main Authors: Pérez, P., Zita, G., Morcuende, R., Martínez-Carrasco, R.
Format: Article
Language:English
Subjects:
Acclimation
Acclimatization
Carbon dioxide
Carboxylation
Chlorophyll
Electron transport
High temperature
Leaves
Oxygenase
Photosynthesis
Proteins
Resource allocation
Resource availability
Ribulose-1,5-bisphosphate
Wheat
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Summary:Differences in acclimation to elevated growth CO2 (700 µmol mol−1, EC) and elevated temperature (ambient +4 °C, ET) in successive leaves of wheat were investigated in field chambers. At a common measurement CO2, EC increased photosynthesis and the quantum yield of electron transport (Φ) early on in the growth of penultimate leaves, and later decreased them. In contrast, EC did not change photosynthesis, and increased Φ at later growth stages in the flag leaf. Contents of chlorophyll (Chl), ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO), and total soluble protein were initially higher and subsequently lower in penultimate than flag leaves. EC decreased RuBPCO protein content relative to soluble protein and Chl contents throughout the development of penultimate leaves. On the other hand, EC initially increased the RuBPCO:Chl and Chl a/b ratios, but later decreased them in flag leaves. In the flag leaves but not in the penultimate leaves, ET initially decreased initial and specific RuBPCO activities at ambient CO2 (AC) and increased them at EC. Late in leaf growth, ET decreased Chl contents under AC in both kinds of leaves, and had no effect or a positive one under EC. Thus the differences between the two kinds of leaves were due to resource availability, and to EC-increased allocation of resources to photon harvesting in the penultimate leaves, but to increased allocation to carboxylation early on in growth, and to light harvesting subsequently, in the flag leaves.
ISSN:0300-3604
1573-9058
DOI:10.1007/s11099-007-0002-8