Yang Zhenbiao
Center for Plant Cell Biology, Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA 92521, USA.
Dev Cell. 2003 Aug;5(2):185-6. doi: 10.1016/s1534-5807(03)00236-3.
Pollen tubes are guided through female tissues to deliver sperms to the embryo sac. A recent study reveals a GABA gradient along the pollen tube path, which, together with guidance defects in GABA-overaccumulating mutants, implies a role for GABA in regulating pollen tube growth and guidance.