Articles
RELATIONSHIPS AMONG SWEET CHERRY LEAF GAS EXCHANGE, MORPHOLOGY AND CHEMICAL COMPOSITION
Article number
795_98
Pages
633 – 638
Language
English
Abstract
Leaf gas exchange, morpho-histological and chemical characteristics were studied in Burlat and Summit sweet cherry (Prunus avium L.) grafted on Maxma 14 rootstock.
Considerable differences existed between cultivars. Summit had higher leaf mass per unit area and total lamina thickness, principally due to thicker spongy parenchyma.
However, Burlat had a higher palisade/spongy tissue ratio and higher stomatal density. Summit leaves had higher concentrations of total chlorophyll and carotenoids, yet Burlat leaves had a significantly higher concentration of total non-structural carbohydrates.
Despite the differences in leaf morpho-histological and chemical characteristics, the values for net CO2 assimilation rate (A), stomatal conductance (gs) transpiration rate (E), mesophyll conductance (gm), intercellular CO2 concentration (Ci) and intrinsic water use efficiency (A/gs) did not vary between cultivars.
Values of A, gs, Ci and gm determined in the morning were consistently higher than in the afternoon.
Higher decreases for A were measured in Summit. A/gs increased from morning to afternoon, mainly in Summit. The present study supplies information about the behaviour, at the leaf scale, of the physiological properties of two cherry cultivars in relation to their morpho-anatomical and chemical characteristics.
Such information is useful to evaluate the carbon physiology at a whole-canopy scale and to study plant-environment interactions.
Considerable differences existed between cultivars. Summit had higher leaf mass per unit area and total lamina thickness, principally due to thicker spongy parenchyma.
However, Burlat had a higher palisade/spongy tissue ratio and higher stomatal density. Summit leaves had higher concentrations of total chlorophyll and carotenoids, yet Burlat leaves had a significantly higher concentration of total non-structural carbohydrates.
Despite the differences in leaf morpho-histological and chemical characteristics, the values for net CO2 assimilation rate (A), stomatal conductance (gs) transpiration rate (E), mesophyll conductance (gm), intercellular CO2 concentration (Ci) and intrinsic water use efficiency (A/gs) did not vary between cultivars.
Values of A, gs, Ci and gm determined in the morning were consistently higher than in the afternoon.
Higher decreases for A were measured in Summit. A/gs increased from morning to afternoon, mainly in Summit. The present study supplies information about the behaviour, at the leaf scale, of the physiological properties of two cherry cultivars in relation to their morpho-anatomical and chemical characteristics.
Such information is useful to evaluate the carbon physiology at a whole-canopy scale and to study plant-environment interactions.
Publication
Authors
B. Gonçalves, J. Moutinho-Pereira, E. Bacelar, C. Correia, A.P. Silva, A. Santos
Keywords
Prunus avium, photosynthesis, photosynthetic pigments, metabolites, leaf anatomy
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