The Rrop GTPase switch turns on polar growth in pollen

Trends Plant Sci. 2000 Jul;5(7):298-303. doi: 10.1016/s1360-1385(00)01654-x.


Pollen-tube growth not only represents an essential stage of plant reproduction but also provides an attractive model for studying cell polarity and morphogenesis. For many years, pollen-tube growth has been known to require a tip-focused Ca2+ gradient and dynamic F actin, but the way that these are controlled remained a mystery until recently. Rop appears to be activated at growth sites by a tip-localized growth cue, acting as a central switch that controls the polar growth of pollen tubes, probably having its effect through phosphoinositides and Ca2+. These findings have begun to shed light on the molecular basis of pollen-tube growth and cell morphogenesis in plants.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Actins / metabolism
  • Calcium Signaling
  • GTP Phosphohydrolases / metabolism*
  • Phosphotransferases (Alcohol Group Acceptor) / metabolism
  • Pollen / enzymology*
  • Pollen / growth & development
  • Pollen / metabolism


  • Actins
  • Phosphotransferases (Alcohol Group Acceptor)
  • 1-phosphatidylinositol-4-phosphate 5-kinase
  • GTP Phosphohydrolases