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Pre- and post-inoculation water stress affects Sphaeropsis sapinea canker length in Pinus halepensis seedlings

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Abstract:

In order to assess the influence of water stress on the development of cankers in , the stems of 4- to 5-year-old potted seedlings were artificially inoculated with the fungus before and after being kept at controlled water regimes from April 1997 to March 1998. In the pre-water-stress inoculation experiment, the canker length, measured 5 months after inoculation (September 1997), was greater in seedlings predisposed to extreme water deficit (midday needle water potential between −4.5 and −5.5 MPa). In the post-water-stress inoculation experiment, the fungus was inoculated in April 1998, after irrigation had enabled the seedlings to resume normal needle water potential. In this case also, at 5 months after inoculation, longer cankers were visible in seedlings that had been subjected to extreme water deficit. These findings suggest that the occurrence of marked water stress, although apparently tolerated by Aleppo pine, can enhance the development of cankers in this species, regardless of whether the stress occurs before or after infection by the fungus.

French
Effet d’un stress pré-ou postinoculation sur la longueur du chancre à Sphaeropsis sapinea chez des semis de Pinus halepensis

Pour évaluer l’influence du stress hydrique sur le développement des chancres àSphaeropsis sapinea chez le Pinus halepensis, des semis en pot âgés de 4–5 ans ont été inoculés à la tige avant ou après avoir été soumis à des régimes hydriques contrôlés d’avril 1997 à mars 1998. Chez les plants inoculés avant le stress hydrique, la longueur des chancres mesurée après 5 mois (septembre 1997) était plus grande chez les semis soumis à un stress extrême (potentiel hydrique minimum des aiguilles: −4,5 à−5,5 MPa). Pour les inoculations après le stress, le champignon a été inoculé en avril 1998 après que l’irrigation ait permis aux semis de retrouver un potentiel hydrique foliaire normal. Dans ce cas aussi, les chancres étaient plus longs, 5 mois après l’inoculation, chez les semis ayant subi un stress hydrique extrême. Ces résultats suggèrent que le développement des chancres àS. sapinea chez le pin d’Alep peut être favorisé par des stress hydriques forts bien qu’ils soient bien tolérés par l’hôte, qu’ils surviennent avant ou après l’infection.

Document Type: Research Article

DOI: http://dx.doi.org/10.1046/j.1439-0329.2001.00237.x

Affiliations: Istituto per la Patologia degli Alberi Forestali (IPAF), C.N.R., Piazzale delle Cascine 28, 50144 Firenze, Italy

Publication date: August 1, 2001

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