Mots eibs Alnus Frankia Nodules pH acides Plantes fi actinorhizes Viabilit6Key words Actinorhizal plant Alnus Frankia Low pH Nodules Viability R~sum6 Vingt souches de Frankia, isol6es ~t partir de 7 esp6ces diff6rentes de plantes actinorhiziennes ont 6t6 cultiv6es sur des milieux maintenus fi des pH constants de 5; 4,8; 4,6 et 4,2. Chaque souche a 6t6 cultiv6e 2 fi 3 fois cons6cutives ~ un m6me pH. Quatorze souches ne montrent aucune croissance fi pH 5. Seules 3 souches r6sistent ~un s6jour de plusieurs semaines ~ pH 4,6. Aucune souche ne demeure viable apr6s un s6jour dans un milieu fi pH 4,2. Les 3 souches acido-r6sistantes supportent 6galement la pr6sence d'A1 + § § libre dans le milieu de culture. Une forte concentration d'H § dans le milieu stimule beaucoup la sporog6n6se.Inocul6e dans un sol acide une souche acido-r~sistante conserve une chance de survie nettement sup~rieure fi celle d'une souche neutrophile maintenue dans les m~mes conditions. Summary Twenty Frankia strains isolated from seven actinorhizal species were cultivated on media at various pH 5; 4.8; 4.6 and 4.2. Each strain was cultivated 2 or 3 times on the same pH. Fourteen strains did not grow at pH 4.6. At pH 4.2 all the strains died after few days. The 3 acido-resistant strains grew with free AI § § § in the culture medium.Inoculated in an acidic soil, the viability of an acido-resistant strain was greater than that of a neutrophilic strain.
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