Responses of Quercus ilex from Different Provenances to Experimentally Imposed Water Stress |
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Authors: | P Pesoli L Gratani W Larcher |
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Institution: | (1) Dipartimento di Biologia Vegetale, Università “La Sapienza”, P. le A. Moro, 5, I-00185 Roma, Italy;(2) Institut für Botanik, Sternwartestrasse 15, A-6020 Innsbruck, Austria |
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Abstract: | Responses of Quercus ilex L. seedlings from three different localities in Italy to experimentally imposed drought stress were analysed. Predawn (Ψpd) and midday (Ψm) leaf water potential of stressed seedlings decreased on an average until −4.0 and −4.2 MPa, respectively, in the severe
water stress. At the end of the severe water stress the relative water content (RWC) was 72.5 – 83.6 % and the photosynthetic
rates (PN) near zero. The critical threshold value of Ψpd for complete stomatal closure was from −4.0 to −4.5 MPa. The leaf damage after the severe water stress was significantly
greater in seedlings originated from the acorns of climax area (45 % total leaf injured area and 40 % fallen leaves) than
in the other seedlings (on an average 20.5 % total leaf injured area and 21 % fallen leaves).
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | drought stress leaf conductance leaf injury net photosynthetic rate relative water content water potential water use efficiency |
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