Naslov
The responsiveness of the IAA2 promoter to IAA and IBA is differentially affected in Arabidopsis roots and shoots by flavonoids

Autori
Rusak, Gordana ; Černi, Silvija ; Stupin Polančec, Darja ; Ludwig-Müller, Jutta

Izvornik
Biologia plantarum (0006-3134) 54 (2010), 3; 403-414

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
isorhamnetin; kaempferol; myricetin; naringenin; phenolics; plant hormones; quercetin

Sažetak
The structural features of flavonoids which are involved in the modulation of auxin distribution in Arabidopsis thaliana were evaluated. An auxin-inducible promoter IAA2 fused to a reporter gene (GUS) was used to monitor the tissue responsiveness to auxins. The following aspects were investigated: 1) the influence of flavonoids (quercetin, naringenin, kaempferol, myricetin and isorhamnetin) on the distribution of indole-3-acetic acid (IAA) and indole-3-butyric acid (IBA) in roots and leaves, 2) differences in flavonoid uptake into roots and shoots depending on flavonoid concentration in the medium, and 3) influence of structurally different flavonoids on the gravitropic response and growth of roots. The same flavonoids differently affected IAA and IBA distribution in leaves and roots. There were several structural requirements for the flavonoids which resulted in the changes of auxin response/distribution. Great differences between the ability of shoots and roots to take up quercetin were showed. Also, flavonoids influenced gravitropism and root growth of Arabidopsis seedlings in a structure-dependent manner.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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