biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 46:577-581, 2003 | DOI: 10.1023/A:1024823830225

Responses of Quercus ilex from Different Provenances to Experimentally Imposed Water Stress

P. Pesoli1, L. Gratani1, W. Larcher2
1 Dipartimento di Biologia Vegetale, Università "La Sapienza", Roma, Italy
2 Institut für Botanik, Innsbruck, Austria

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).

Keywords: drought stress; leaf conductance; leaf injury; net photosynthetic rate; relative water content; water potential; water use efficiency
Subjects: gas exchange, oak provenance differences; leaf injury, oak provenance differences; oak, provenance differences, water stress; Quercus ilex; relative water content; stomatal conductance, oak provenance differences; water potential, oak provenance differences; water stress, oak provenance differences; water use efficiency, oak provenance differences

Prepublished online: May 1, 2003; Published: December 1, 2003  Show citation

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Pesoli, P., Gratani, L., & Larcher, W. (2003). Responses of Quercus ilex from Different Provenances to Experimentally Imposed Water Stress. Biologia plantarum, 46(4), 577-581. doi: 10.1023/A:1024823830225
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