Articles
EFFECT OF TRAINING SYSTEM ON HAZELNUT (CORYLUS AVELLANA) PHYSIOLOGY
Article number
845_33
Pages
239 – 244
Language
English
Abstract
Variations in leaf morpho-anatomy, chemical composition, gas exchange and water relations were studied in Corylus avellana L. cultivars Butler and Segorbe, grown freely as multi-stemmed shrubs and as a free single trunk (free vase), during 2007. The trial was installed in 1980 with several commercial hazelnut cultivars in Northern Portugal, at 470 m above sea level.
The leaf traits analysed included leaf mass per unit area (LMA), area, relative water content (RWC), succulence, the thickness of palisade and spongy parenchyma and epidermis, photosynthetic pigments, carbohydrates and total phenols concentrations.
Net CO2 assimilation rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, intrinsic water use efficiency and leaf water potential were also determined.
Cultivar (cv.) Segorbe grown on a single trunk and cv. Butler grown freely presented the higher LMA. Trees grown on a single trunk had higher RWC than trees grown freely.
Higher LMA presented by Butler grown freely was associated with higher total lamina thickness.
Higher total lamina thickness of Butler on multi-stemmed was mainly due to a greater palisade parenchyma.
The leaves of Butler and Segorbe grown freely, having a thicker palisade parenchyma, had higher values of gs and A. No significant differences in midday leaf water potential (ΨMD) were found between cultivars and training systems.
Cv. Segorbe on single trunk and cv. Butler grown freely had leaves with higher total chlorophyll and total phenol concentrations.
In addition, Segorbe trees had higher carotenoid and starch concentrations.
From a horticultural point of view it seems that cv. Butler will benefit if grown freely and cv. Segorbe on single trunk.
The leaf traits analysed included leaf mass per unit area (LMA), area, relative water content (RWC), succulence, the thickness of palisade and spongy parenchyma and epidermis, photosynthetic pigments, carbohydrates and total phenols concentrations.
Net CO2 assimilation rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, intrinsic water use efficiency and leaf water potential were also determined.
Cultivar (cv.) Segorbe grown on a single trunk and cv. Butler grown freely presented the higher LMA. Trees grown on a single trunk had higher RWC than trees grown freely.
Higher LMA presented by Butler grown freely was associated with higher total lamina thickness.
Higher total lamina thickness of Butler on multi-stemmed was mainly due to a greater palisade parenchyma.
The leaves of Butler and Segorbe grown freely, having a thicker palisade parenchyma, had higher values of gs and A. No significant differences in midday leaf water potential (ΨMD) were found between cultivars and training systems.
Cv. Segorbe on single trunk and cv. Butler grown freely had leaves with higher total chlorophyll and total phenol concentrations.
In addition, Segorbe trees had higher carotenoid and starch concentrations.
From a horticultural point of view it seems that cv. Butler will benefit if grown freely and cv. Segorbe on single trunk.
Publication
Authors
B. Gonçalves, A.P. Silva, E. Bacelar, C. Correia, A. Santos, H. Ferreira, J. Moutinho-Pereira
Keywords
carbohydrates, hazelnut, leaf anatomy, leaf gas exchange, phenols, photosynthetic pigments, training systems, water relations
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