Claim · model-written summary
Zea mays photosynthetic CO2 assimilation fell as leaf temperature fell, reaching about 7% of the 20 °C value at 5 °C.
Zea maysVerbatim
e0“Photosynthetic CO2 assimilation (Fc) decreased markedly with decrease in leaf temperature so that Fc at 5 °C was c. 7% of Fc at 20 °C.”
t0“Young Zea mays”
Title
LONG, S. P.; EAST, T. M.; BAKER, N. R. HighWire Press Open Archive . doi:10.1093/jxb/34.2.177
Other claims from this paper (10)
- Observation Assimilation continued declining during sustained exposure to 5 °C.
- Intervention effect After chilling, the leaf did not regain its prior assimilation rate at 20 °C.
- Association Chill-related assimilation loss increased with duration of the chill.
- Association Chill-related assimilation loss increased with water vapour pressure deficit.
- Association Chill-related assimilation loss increased with photon flux density.
- Intervention effect Six hours at 5 °C reduced returning Fc by c. 10% under darkness.
- Intervention effect Six hours at 5 °C reduced returning Fc by c. 50% under photon flux density approaching full-sunlight.
- Association Post-chill assimilation reduction depended almost linearly on chill length and temperature.
- Intervention effect Chilling decreased stomatal and mesophyll conductance.
- Mechanism The authors inferred that chilling impaired both light-limited and CO2-limited photosynthetic processes.