The stimulating effects of ethylene and auxin on petiole elongation and on hyponastic curvature are independent processes in submerged <i>Rumex palustris</i>

Cox, Marjolein C.H.; Peeters, Anton J. M.; Voesenek, Laurentius A. C. J.

doi:10.1111/j.1365-3040.2005.01420.x

Cited by 37 publications

(21 citation statements)

References 30 publications

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“…Furthermore, transcripts of AUXIN (INDOLE-3-ACETIC ACID)2-11 putative orthologs, a typical auxin responsive gene (Wyatt et al, 1993), were regulated only in R. palustris. These transcriptome changes are consistent with the previously identified role of auxin transport and abundance in the early hours of submergence-induced petiole elongation (Cox et al, 2006).…”

Section: Hormonal Regulation Of Petiole Growth In R Acetosa and R Psupporting

confidence: 78%

“…R. acetosa is rarely flooded in nature and these floods are generally short-lasting compared with R. palustris, which is frequently exposed to prolonged but shallow floods . Upon submergence, R. palustris orientates its leaves from a horizontal to vertical position (hyponastic growth), in an ethylene-dependent manner, and subsequently enhances the elongation rate of mainly the youngest petioles (Cox et al, 2006). In R. acetosa, this petiole elongation is suppressed by ethylene that accumulates during submergence (Voesenek et al, 1993a;Pierik et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Two Rumex Species from Contrasting Hydrological Niches Regulate Flooding Tolerance through Distinct Mechanisms

et al. 2013

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ORCID ID: 0000-0002-6940-0657 (R.S.).Global climate change has increased flooding events, which affect both natural vegetation dynamics and crop productivity. The flooded environment is lethal for most plant species because it restricts gas exchange and induces an energy and carbon crisis. Flooding survival strategies have been studied in Oryza sativa, a cultivated monocot. However, our understanding of plant adaptation to natural flood-prone environments remains scant, even though wild plants represent a valuable resource of tolerance mechanisms that could be used to generate stress-tolerant crops. Here we identify mechanisms that mediate the distinct flooding survival strategies of two related wild dicot species: Rumex palustris and Rumex acetosa. Whole transcriptome sequencing and metabolite profiling reveal flooding-induced metabolic reprogramming specific to R. acetosa. By contrast, R. palustris uses the early flooding signal ethylene to increase survival by regulating shade avoidance and photomorphogenesis genes to outgrow submergence and by priming submerged plants for future low oxygen stress. These results provide molecular resolution of flooding survival strategies of two species occupying distinct hydrological niches. Learning how these contrasting flood adaptive strategies evolved in nature will be instrumental for the development of stress-tolerant crop varieties that deliver enhanced yields in a changing climate.

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Section: Hormonal Regulation Of Petiole Growth In R Acetosa and R Psupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Two Rumex Species from Contrasting Hydrological Niches Regulate Flooding Tolerance through Distinct Mechanisms

et al. 2013

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“…Differential growth of the petiole is proposed to involve a redistribution of the auxin IAA (indole-3-acetic acid) transported from the leaf blade (Cox et al, 2006). Ethylene induces a reduction in the concentration of ABA in the petiole followed by an increase in GA production, which is associated with enhanced GA3ox expression (Benschop et al, 2006).…”

Section: Reviewmentioning

confidence: 99%

The role of gibberellin signalling in plant responses to abiotic stress

Colebrook

Thomas

Phillips

et al. 2014

Journal of Experimental Biology

846

557

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Plant hormones are small molecules that regulate plant growth and development, as well as responses to changing environmental conditions. By modifying the production, distribution or signal transduction of these hormones, plants are able to regulate and coordinate both growth and/or stress tolerance to promote survival or escape from environmental stress. A central role for the gibberellin (GA) class of growth hormones in the response to abiotic stress is becoming increasingly evident. Reduction of GA levels and signalling has been shown to contribute to plant growth restriction on exposure to several stresses, including cold, salt and osmotic stress. Conversely, increased GA biosynthesis and signalling promote growth in plant escape responses to shading and submergence. In several cases, GA signalling has also been linked to stress tolerance. The transcriptional regulation of GA metabolism appears to be a major point of regulation of the GA pathway, while emerging evidence for interaction of the GA-signalling molecule DELLA with components of the signalling pathway for the stress hormone jasmonic acid suggests additional mechanisms by which GA signalling may integrate multiple hormone signalling pathways in the response to stress. Here, we review the evidence for the role of GA in these processes, and the regulation of the GA signalling pathway on exposure to abiotic stress. The potential mechanisms by which GA signalling modulates stress tolerance are also discussed.

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“…Both are induced by an array of environmental cues, including canopy light signals (Ballaré, 1999;Pierik et al, 2003;Vandenbussche et al, 2003), waterlogging and submergence (Jackson, 2002;Cox et al, 2003), and low temperatures (Nilsen, 1991). Furthermore, the plant hormones ABA, gibberellic acid (GA), and auxin are suggested to play a regulatory role (Benschop et al, 2005;Cox et al, 2006). Also, petioles of Arabidopsis (Arabidopsis thaliana) show a rapid hyponastic growth when treated with ethylene (Millenaar et al, 2005).…”

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confidence: 99%

Abscisic Acid Antagonizes Ethylene-Induced Hyponastic Growth in Arabidopsis

et al. 2006

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Ethylene induces enhanced differential growth in petioles of Arabidopsis (Arabidopsis thaliana), resulting in an upward movement of the leaf blades (hyponastic growth). The amplitude of this effect differs between accessions, with Columbia-0 (Col-0) showing a large response, while in Landsberg erecta (Ler), hyponastic growth is minimal. Abscisic acid (ABA) was found to act as an inhibitory factor of this response in both accessions, but the relationship between ethylene and ABA differed between the two; the ability of ABA to inhibit ethylene-induced hyponasty was significantly more pronounced in Col-0. Mutations in ABI1 or ABI3 induced a strong ethylene-regulated hyponastic growth in the less responsive accession Ler, while the response was abolished in the ABA-hypersensitive era1 in Col-0. Modifications in ABA levels altered petiole angles in the absence of applied ethylene, indicating that ABA influences petiole angles also independently from ethylene. A model is proposed whereby the negative effect of ABA on hyponastic growth is overcome by ethylene in Col-0 but not in Ler. However, when ABA signaling is artificially released in Ler, this regulatory mechanism is bypassed, resulting in a strong hyponastic response in this accession.

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The stimulating effects of ethylene and auxin on petiole elongation and on hyponastic curvature are independent processes in submerged Rumex palustris

Cited by 37 publications

References 30 publications

Two Rumex Species from Contrasting Hydrological Niches Regulate Flooding Tolerance through Distinct Mechanisms

Two Rumex Species from Contrasting Hydrological Niches Regulate Flooding Tolerance through Distinct Mechanisms

The role of gibberellin signalling in plant responses to abiotic stress

Abscisic Acid Antagonizes Ethylene-Induced Hyponastic Growth in Arabidopsis

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