New Zealand Journal of Crop and Horticultural Science abstracts
Daily measurement of CO2 assimilation rate on a kiwifruit vine
F. SUCCI
E. MAGNANINI
Dipartimento di Colture Arboree
Università degli Studi di Bologna
Via Filippo Re 6
40126 Bologna, Italy
G. COSTA
Dipartimento di Produzione Vegetale
e Tecnologia Agraria
Università di Udine
Viale delle Scienze 208
33100 Udine, Italy
Abstract CO2 assimilation rate of a `Hayward' kiwifruit
(
Actinidia deliciosa (A. Chev.) C.F. Liang et A.R. Ferguson) adult vine
was measured during the summer of 1989 by two methods. One, an open-system
chamberenclosing a whole vine canopy, was designed for continuous
investigation of photosynthesis via the monitoring of external light, humidity,
air flow, and air CO2 concentration. The other was the ADC-LCA1 system, which
sampled only a part of a single leaf. The results indicate that photosynthesis
rate value increases with light intensity in both instances, but, with respect
to the single-leaf CO2 measurements, the whole canopy CO2 exchange measurement
shows lower variability. Also absolute values for single leaf photosynthesis
are higher than those observed for the whole plant.
Keywords Actinidia deliciosa; kiwifruit; light
interception; photosynthesis; leaves; canopy
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