Open AccessColonization of native A ndean grasses by arbuscular mycorrhizal fungi in P una: a matter of altitude, host photosynthetic pathway and host life cycles
Author(s) -
Lugo Mónica A.,
Negritto María A.,
Jofré Mariana,
Anton Ana,
Galetto Leonardo
Publication year - 2012
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.2012.01373.x
Subject(s) - colonization , biology , perennial plant , altitude (triangle) , host (biology) , symbiosis , ecology , botany , bacteria , genetics , geometry , mathematics
The relationships of altitude, host life cycle (annual or perennial) and photosynthetic pathway ( C 3 or C 4 ) with arbuscular mycorrhiza ( AM ) root colonization were analysed in 35 species of A ndean grasses. The study area is located in north‐western Argentina along altitudinal sites within the P una biogeographical region. Twenty‐one sites from 3320 to 4314 m were sampled. Thirty‐five grasses were collected, and the AM root colonization was quantified. We used multivariate analyses to test emerging patterns in these species by considering the plant traits and variables of AM colonization. P earson's correlations were carried out to evaluate the specific relationships between some variables. Most grasses were associated with AM , but the colonization percentages were low in both C 3 and C 4 grasses. Nevertheless, the AM root colonization clearly decreased as the altitude increased. This distinctive pattern among different species was also observed between some of the populations of the same species sampled throughout the sites. An inverse relationship between altitude and AM colonization was found in this S outhern H emisphere A ndean system. The effect of altitude on AM colonization seems to be more related to the grasses' photosynthetic pathway than to life cycles. This study represents the first report for this biogeographical region.