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- Title
Black leaf-clips of a commercial fluorometer increased leaf temperature during dark adaptation under high solar radiation.
- Authors
Giorio, P.; Nuzzo, V.; Guida, G.; Albrizio, R.
- Abstract
The use of black leaf-clips for dark adaptation under high solar radiation conditions is reported to underestimate the maximum quantum yield of PSII photochemistry (F/F) measured by the continuous-excitation fluorometer Pocket PEA. The decrease in F/F was due to a rise in minimum fluorescence emission (F), probably resulting from increased leaf temperature (T). In field-grown tomato and pepper, fluorescence parameters and T in the region covered by the black leaf clip were measured in clipped leaves exposed to solar radiation during dark adaptation (clipped-only leaves) and in clipped leaves protected from solar radiation by aluminium foil (shrouded clipped leaves). Results confirmed significant F/F underestimates in clipped-only leaves primarily due to increased F. In one tomato experiment, T increased from 30 to 44.5°C in clipped-only leaves, with a negligible rise in shrouded clipped leaves. In two respective pepper experiments, T in clipped-only leaves increased from 27 to 36.2°C and 33 to 40.9°C. Based on the results of this study, a clip-effect parameter (P) on fluorescence emission is proposed as the difference for F/F (or −F/F) between shrouded clipped leaves and clipped-only leaves, which resulted to be 0.706 for tomato, and 0.241 and 0.358 for the two pepper experiments.
- Subjects
EFFECT of solar radiation on plants; PLANT adaptation; PHOTOSYSTEMS; FLUORESCENCE; TOMATOES; PEPPERS
- Publication
Photosynthetica, 2012, Vol 50, Issue 3, p467
- ISSN
0300-3604
- Publication type
Article
- DOI
10.1007/s11099-012-0042-6