Ecophysiology of Seedlings of Three Deciduous Oak Species During Summer Water Deficit

Abubakr Mohamed Juma Siam, Kalliopi Radoglou, Basilios Noitsakis, Pavlos Smiris


Seasonal responses of water relations and photochemical
efficiency of photo system II to summer water deficit of one-year old
seedlings of Quercus pubescens, Quercus ithaburensis and Quercus
frainetto were investigated under field conditions in Greece. Seedlings
were transplanted from nursery to field in February 2003. Half of the
seedlings of each species were kept well-watered, while the other half was
exposed to field condition. The measurements were conducted from May
through October. As the soil water deplete both predawn and afternoon
water potentials and maximum photochemical efficiency of photo system
II were decreased. Q. ithaburensis displayed significantly higher water
potentials and photochemical efficiency than the other species. Moreover
the Q. ithaburensis and O. pubescens recovered their water potentials and
photochemical efficiency to levels similar to control plants after moisture
improvement. Thus, Q. ithaburensis tended to show more drought
tolerance characteristics among the studied Oaks. In contrast, drought


Ecophysiology; oak Species; water stress

Full Text:



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