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result of alkaloid toxins that the endophytes This example is not generally representa-
 

Summary: result of alkaloid toxins that the endophytes
produce.
This example is not generally representa-
tive, however. In most plants, it is individual
leaves that are colonized by a diversity of
endophyticfungi,eachforminghighlylocal-
izedinfections.Theseinfectionsareacquired
independently by horizontal transmission
through wind- or water-dispersed spores.In
grasses,the persistence of highly mutualistic
fungi is evidently a direct consequence of
their strict vertical transmission through
seeds. The diversity and dynamics of hori-
zontally transmitted endophytes, or other
mutualistic microbes, is less clear5
. Given
that endophytes use their hosts' resources,
they must entail some cost to the plant.If the
costs outweigh the benefits,why don't plants
defend themselves against infection? And if

  

Source: Arnold, A. Elizabeth - School of Plant Sciences, University of Arizona

 

Collections: Biology and Medicine