Authors: Eugenia E Chaia Claudio Valverde Luis G Wall
Publish Date: 2006/11/13
Volume: 53, Issue: 6, Pages: 523-528
Abstract
Frankia BCU110601 Da and Frankia BCU110345 Dc were isolated from root nodules of Discaria articulata and Discaria chacaye respectively Frankia BCU110501 Dt was previously isolated from Discaria trinervis The strains were identical at the 16S sequence and after analysis of RFLP of 16S and 23S rDNA intergenic region Diversity was revealed at the molecular level after fingerprint analysis by BOX–polymerase chain reaction The strains were infective and effective on the original host plants A crossinoculation assay intra Discaria genus including D trinervis D articulata and D chacaye with each of these isolated Frankia strains caused effective symbioses with a similar dry weight in each plant species regardless of the inoculated strain Nevertheless a differential degree of recognition was revealed Homologous symbiotic pairs in the case of D chacaye–Frankia BCU110345 Dc D articulata–Frankia BCU110601 Da and D trinervis–Frankia BCU110501 Dt had faster nodulation rates than heterologous pairs The differences in nodulation rate would suggest the existence of a subspecific level of recognition within a certain crossinoculation group pointing to subspecific adaptation occurring in this actinorhizal symbiosisWe thank G Vobis MI Messuti and MM Bunge for valuable comments This work was supported by Universidad Nacional de Quilmes grant No PPUNQ 0340/03 CONICET grant No PIP5812 and Universidad Nacional del Comahue LGW and CV are researchers at CONICET Argentina
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