Ethylene Regulates Root Growth through Effects on Auxin Biosynthesis and Transport-Dependent Auxin Distribution[W]

By Kamil Růžička, K. Ljung, Steffen Vanneste, Radka Podhorská, T. Beeckman, Jir□í Friml, E. Benková. The Plant Cell Online, 2007

811 citations recorded by the source corpus.

In plants, each developmental process integrates a network of signaling events that are regulated by different phytohormones, and interactions among hormonal pathways are essential to modulate their effect. Continuous growth of roots results from the postembryonic activity of cells within the root meristem that is controlled by the coordinated action of several phytohormones, including auxin and ethylene. Although their interaction has been studied intensively, the molecular and cellular mechanisms underlying this interplay are unknown. We show that the effect of ethylene on root growth is largely mediated by the regulation of the auxin biosynthesis and transport-dependent local auxin distribution. Ethylene stimulates auxin biosynthesis and basipetal auxin transport toward the elongation zone, where it activates a local auxin response leading to inhibition of cell elongation. Consistently, in mutants affected in auxin perception or basipetal auxin transport, ethylene cannot activate the auxin response nor regulate the root growth. In addition, ethylene modulates the transcription of several components of the auxin transport machinery. Thus, ethylene achieves a local activation of the auxin signaling pathway and regulates root growth by both stimulating the auxin biosynthesis and by modulating the auxin transport machinery.

Subfields: Molecular Biology, Plant Science

View Paper: https://www.semanticscholar.org/paper/61d2245d508a4e31c28ac9c2fa0204d750a65857

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Molecular Biology

1. Jir□í Friml
2. J. Petrášek
3. René Benjamins
4. Ben Scheres
5. G. Jürgens
6. José M. Alonso
7. E. Blumwald
8. T. Beeckman

In Plant Science

1. Jir□í Friml
2. J. Petrášek
3. René Benjamins
4. Ben Scheres
5. G. Jürgens
6. Zvi Peleg
7. Martin Crespi
8. G. Berta

Citations in the corpus

• Auxin transport routes in plant development (2009, background): “Other plant hormones, such as ethylene or cytokinins, might also modulate the expression of PIN and AUX1 proteins (Dello Ioio et al., 2008; Pernisová et al., 2009; Růzicka et al., 2007; Růzicka et al., 2009).”
• Hormone balance and abiotic stress tolerance in crop plants. (2011, background): “Among them, are the auxin-responsive factors ARF2 and ARF19 [23,24], the auxin transporters PIN1, PIN2, PIN4, AUX1 [25], and genes encoding auxin biosynthetic enzymes (ASA1/WEI2/TIR7, ASB1/WEI7, TAA1/SAV3/ WEI8) [26,27 ].”
• Comprehending crystalline β-carotene accumulation by comparing engineered cell models and the natural carotenoid-rich system of citrus (2011, neutral): “Several previous studies have shown that ethylene inhibits root growth by up-regulating auxin biosynthesis and interfering with its transport process (Stepanova et al., 2005, 2007; Růzicka et al., 2007; Swarup et al., 2007; Negi et al., 2008).”
• Plant root growth, architecture and function (2009, background): “…synthase ß1 (ASB1) genes that encode rate-limiting tryptophan biosynthesis enzymes In addition, ethylene modulates the transcription of several components of the auxin transport machinery and induces a local activation of the auxin signaling pathway to regulate root growth (Ruzicka et al. 2007).”
• TAA1-mediated auxin biosynthesis is essential for hormone crosstalk and plant development. (2008, background): “Local Activation of Auxin Biosynthesis Mediates Tissue-Specific Ethylene Responses Several mechanistic models for the ethylene-auxin crosstalk in roots have been proposed (Ruzicka et al., 2007; Stepanova et al., 2007; Swarup et al., 2007).”
• Review Article:Root development in horticultural plants grown under abiotic stress conditions – a review (2011, background): “In addition, Ruzicka et al. (2007) showed that ethylene exerted its effect on root morphology by altering the distribution of auxin within the root tip, inhibiting root elongation and promoting the initiation of lateral roots.”
• Auxin: the looping star in plant development. (2008, background): “The effect of ethylene on root development is likely to proceed via upregulation of auxin biosynthesis as well as modulation of auxin transport (102, 115).”