Special seminar - Christina Straub: Ecological genetics of resident Pseudomonas syringae on kiwifruit
Aug 9, 2018
12:00 - 13:00
Christina Straub, Massey University, Auckland, New Zealand
are densely occupied by a diverse range of microorganisms. The
bacteria in particular hot spots on leaves greatly facilitates
interspecific interactions, which can have effects on population
structure and the
Pseudomonas syringae, a
ubiquitous plant pathogen, infects a variety of plant hosts.
During an outbreak of bleeding canker disease
on kiwifruit caused by P.
syringae pv. actinidiae (Psa)
in New Zealand, we investigated the population structure and
of a broad range of co-occurring P. syringae isolated
from infected and
uninfected kiwifruit plants. After recovering a novel clade of
P. syringae (Phylogroup
3a), which was
found to be associated with kiwifruit on a global scale, we
performed a variety
of competition experiments to unravel the interaction dynamics
co-occurring isolates and the pathogen Psa.
Since the presence of the commensal isolate inhibited the
growth of Psa, we
subsequently used a comparative
genomics approach to explore the potential role of these
strains in the
evolution of virulence, along with pathogenicity assays on
This talk will be the culmination of five
years of research on the
ecological genetics of P.