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Science et changements planétaires / Sécheresse

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La génétique de Pisolithus sp. : une approche de biotechnologie forestière pour une meilleure survie des plants en conditions de sécheresse Volume 2, issue 4, Décembre 1991

Authors
Centre de Recherche en Biologie Forestière, Faculté de Foresterie et de Géomatique, Université Laval, Sainte-Foy, Québec, Canada G1K 7P4, Institut de Recherche en Biologie Végétale, 4101 est, rue de Sherbrooke, Montréal, Canada, H1X 2B2, Forêts Canada, Centre de Foresterie des Laurentides CP 3800. Sainte-Foy, Québec, Canada G1V 4C7.
  • Page(s) : 251-8
  • Published in: 1991

Monokaryotic and dikaryotic cultures of Pisolithus sp. from South Africa differed in their ability to colonize Pinus pinaster roots. Growth of P. pinaster was more strongly influenced by dikaryons than by monokaryons. Monokaryotic cultures did not form mycelial strands. In contrast, dikaryons showed much variation in both the ability to form strands and in strand diameter. The results are discussed in relation to nutrient and water absorption. Physiological indicators of P. pinaster seedlings inoculated with different dikaryons were evaluated during a drought cycle. Dikaryons having extensive mycelial strands tolerated drought better and recovered more rapidly from drought than those that produced only fine hyphae. These results indicate that the potential exist to select genotypes of Pisolithus for reforestation program in arid and semiarid zones.