Short-Lived and Phosphorylated Proteins Contribute to Carrier
in) Active auxin transport in plant cells is mediated by two carriers of the PM acting in opposite directions (Rubery, 1987; Lomax et al , 1995) The influx carrier, the physiolog-ical function of which at the integrated levels of organs or the whole plant is unknown, imports hormones from the surrounding medium The efflux carrier excretes
Signalling: The Green Light to Leaf Development
that auxin gradients within the SAM play a key role in determining sites of organ initiation and as such may be the principal signal involved in phyllotactic patterning Auxin gradients arise through a combination of auxin synthesis and transport In the case of indole-3-acetic acid (IAA), the best studied of the auxins, the biosynthetic path-
Cytokinins and plant immunity: old foes or new friends?
suppressed by auxin secreted from A tumefaciens, which employs auxin for pathogenicity and crown-gall formation [18], thus suggesting that pathogen-derived auxin specifically suppresses the cytokinin-induced de-fense response during infection (Figure 1) Cytokinins prompt salicylic acid accumulation and a defense response In
AUX1 regulates root gravitropism in Arabidopsisby
The EMBO Journal Vol 18 No 8 pp 2066–2073, 1999 AUX1 regulates root gravitropism in Arabidopsisby facilitating auxin uptake within root apical tissues Alan Marchant1, Joanna Kargul1,2, Sean T
Ti Plasmids from Agrobacterium Characterize Rootstock Clones
involved in the synthesis of the plant hormones auxin and cytokinin, respectively, which are responsible for uncontrolled cell proliferation during crown gall tumorigenesis (23, 26, 29) The T-DNA also encodes enzymes used for the synthesis of tumor-specific compounds, called opines Opines are released
Conférence : Les hormones végétales Les contenus des
changement de répartition des hormones dans le végétal qui conduit à unchangement de morphologie La totipotence des cellules végétales permet le clonage Les proportions des différentes hormones (rapport des concentrations d'auxine et de cytokinine) contrôlent l'organogénèse (tige, racines)
Les hormones végétales
fois assimilées à des hormones végé-tales Il n’est pas évident que ces molécules agissent à distance, comme les hormones, et ces substances et les composés associés sont plutôt dénom-més régulateurs de la croissance végé-tale, ou phytorégulateurs Ces régulateurs ont une caractéristique commune : la capacité de comman-
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