Here we present an overview of what is known about endogenous plant compounds that act as inhibitors of hormonal transport processes in plants, about their identity and mechanism of action. We have also summarized commonly and less commonly used compounds of non-plant origin and synthetic drugs that show at least partial 'specificity' to transport or transporters of particular phytohormones. Our main attention is focused on the inhibitors of auxin transport. The urgent need to understand precisely the molecular mechanism of action of these inhibitors is highlighted.

Institute of Experimental Botany The Czech Academy of Sciences Rozvojová 263 165 02 Prague 6 Czech Republic

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Lessons Learned from the Studies of Roots Shaded from Direct Root Illumination