Alternatively, there might exist CLV3p-FLS2 independent protection
mechanisms in susceptible SAM. Owing to the scarcity of detailed literature on stem-celltriggered
immunity in plants, the underlying mechanism delineating how Pst DC3000 fails to
dampen CLV3p-FLS2 mediated immunity in the SAM remains to be determined. We suggest
the following hypotheses to address the lack of effectiveness of Pst DC3000 effectors in
breaching CLV3p-FLS2 mediated immunity in the SAM:
(i) Unlike apoplastic fluid, which is analogous to hrp inducing medium (Rico and Preston