3.7 Effects of environmental factors on endophyte abundance or
richness
GLM was used to assess the effect of different environmental factors on
endophyte abundance or richness at bacterial genus level or fungal
species level. The results showed that richness of bacterial genus
negatively correlated with pH and TN for the whole plant bacterial
communities and positively correlated with roots (Table 2). The
bacterial communities in roots showed the same trend with the whole
plant bacterial communities, that the richness negatively correlated
with pH and TN. The richness of fungal taxa for the whole plant fungal
communities negatively correlated with roots. The fungal communities in
roots positively correlated with TN and negatively correlated with OM.
There was no significant correlation among bacterial or fungal diversity
in aerial tissues and environmental factors.
The abundance of bacterial genera Cupriavidus andBrevibacterium positively correlated with P and OM in whole plant
bacterial community (Table 3). The abundance of fungal taxaSaitozyma podzolica , Sporormiaceae FOTU_583, AporosporaFOTU_199, fungal genus Saitozyma and Neocamarosporium ,
and class Dothideomycetes positively correlated with roots. No fungal
group showed significant correlation with abiotic environmental factors
except Acremonium chrysogenum , which negatively correlated with
medium radiation level.