ISHS Acta Horticulturae 686: VI International Congress on Hazelnut
EFFECT OF IRRIGATION ON PHYSIOLOGICAL AND BIOCHEMICAL TRAITS OF HAZELNUTS (CORYLUS AVELLANA L.) |
| Authors: | R. Dias, B. Conçalves, J. Moutinho-Pereira, J.L. Carvalho, A.P. Silva |
| Keywords: | water relations, photosynthesis, chlorophylls, carotenoids, starch, soluble sugars, ´Grada de Viseu´ |
| Abstract:
Leaf gas-exchange parameters (A, gs, Ci and A/gs), leaf water potential (Ψleaf), and leaf metabolites (photosynthetic pigments, soluble sugars and starch) were measured in ‘Grada de Viseu’ (a traditional portuguese hazelnut cultivar) under four different irrigation treatments based on ETc levels (100, 75, 50 and 0%), in 2003. There were significant differences between the four irrigation treatments with respect to chlorophyll a (Chla), chlorophyll b (Chlb), total chlorophyll (Chltotal) and carotenoids (P < 0.001), in gs, Ci and soluble sugars (P < 0.01), and also with respect to starch and total sugar content (P < 0.05). At ETc 100 and ETc 75, ‘Grada de Viseu’ showed the highest levels of A, gs, and Ci. Levels of metabolites (Chla, Chlb, Chltotal and carotenoids) were also consistently higher in these treatments than in others. Our evaluation indicates that irrigation conditions during hazelnut growth have a great influence on physiological parameters and probably also on fruit quality. However, data for several more years and/or different irrigation treatments are required before any firm conclusions can be drawn on these issues. | |
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