Hormone interactions during vascular development
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Vascular tissue in plants is unique due to its diverse and dynamic cellular patterns. Signals controlling vascular development have only recently started to emerge through biochemical, genetic, and genomic approaches in several organisms, such as Arabidopsis, Populus, and Zinnia. These signals include hormones (auxin, brassinosteroids, and cytokinins, in particular), other small regulatory molecules, their transporters, receptors, and various transcriptional regulators. In recent years it has become apparent that plant growth regulators rarely act alone, but rather their signaling pathways are interlocked in complex networks; for example, polar auxin transport (PAT) regulates vascular development during various stages and an emerging theme is its modulation by other growth regulators, depending on the developmental context. Also, several synergistic or antagonistic interactions between various growth regulators have been described. Furthermore, shoot–root interactions appear to be important for this signal integration.
KeywordsVascular meristem HD-ZIPIII genes Auxin Cytokinin
We thank Anthony Bishopp for critical reading of the manuscript. JD is supported by the European Molecular Biology Organisation (EMBO, ALTF 450-2007).
- Bjorklund S, Antti H, Uddestrand I, Moritz T, Sundberg B (2007) Cross-talk between gibberellin and auxin in development of Populus wood: gibberellin stimulates polar auxin transport and has a common transcriptome with auxin. Plant J 52:499–511. doi: 10.1111/j.1365-313X.2007.03250.x PubMedGoogle Scholar
- Clark SE, Running ME, Meyerowitz EM (1995) CLAVATA3 is a specific regulator of shoot and floral meristem development affecting the same processes as CLAVATA1. Development 121:2057–2067Google Scholar
- Digby J, Wareing PF (1966) The effect of applied growth hormones on cambial division and the differentiation of the cambial derivates. Ann Bot (Lond) 30:539–548Google Scholar
- Gouwentak C (1941) Cambial activity as dependent on the presence of growth hormone and the presence of non-resting conditions of stems. Proc Ned Akad V Wetensch, Amsterdam 44:654–663Google Scholar
- Ishida K, Yamashino T, Yokoyama A, Mizuno T (2008) Three type-B response regulators, ARR1, ARR10 and ARR12, play essential but redundant roles in cytokinin signal transduction throughout the life cycle of Arabidopsis thaliana. Plant Cell Physiol 49:47–57. doi: 10.1093/pcp/pcm165 PubMedGoogle Scholar
- Müller B, Sheen J (2007) Arabidopsis cytokinin signaling pathway. Sci STKE 407:cm5. doi:10.1126/stke.4072007cm5Google Scholar
- Sachs T (1981) The control of the patterned differentiation of vascular tissues. Adv Bot Res 9:151–262Google Scholar
- Scheres B, Di Laurenzio L, Willemsen V, Hauser MT, Janmaat K, Weisbeek P et al (1995) Mutations affecting the radial organisation of the Arabidopsis root display specific defects throughout the embryonic axis. Development 121:53–62Google Scholar
- Schrader J, Baba K, May ST, Palme K, Bennett M, Bhalerao RP et al (2003) Polar auxin transport in the wood-forming tissues of hybrid aspen is under simultaneous control of developmental and environmental signals. Proc Natl Acad Sci USA 100:10096–10101. doi: 10.1073/pnas.1633693100 PubMedGoogle Scholar