Table 2.
Phylogenetic Groups of the Rop-Subfamily Rho GTPases and Known or Potential Functions
| Groups | Arabidopsisa | Cotton (Gh)/Tobacco (Nt) | Maize (Zm)/Rice (Os) |
|---|---|---|---|
| I | ROP8 (function unknown) | — | — |
| II | ROP9/ROP10 (ABA responses–LOF/DN/CA) ROP11 (function unknown) |
— — |
OsRac1 (H2O2 production–DN/CA) OsRac2 to OsRac4, ZmROP6 to ZmROP8 (function unknown) |
| III | ROP7 (inhibition of root hair tip growth–OX) | GhRac9/GhRac13 (H2O2 production–DN/CA) | OsRop5 (function unknown) |
| IV | ROP1 to ROP6 (actin dynamics, polar growth, root hair development, ABA responses–DN/CA/OX) |
GhRac1 (function unknown) | ZmROPB/ZmROPD (function unknown) |
a Approaches used for functional analysis: LOF, loss-of-function; DN, dominant negative mutants; CA, constitutively active mutants; OX, overexpression.