The gravireaction of Ceratodon protonemata treated with gibberellic acid

Chaban, Ch.I.; Kordyum, Е.L.; Демків, О.Т.; Khorkavtsiv, Ya.D.

doi:10.1016/s0273-1177(99)00404-4

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…While untreated protonemata grow vertically, GA 3 treated ones grew in various direction showing angles divergent from the vertical, suggesting a defect in gravitropism (Figure 8K ). This response is reminiscent of the effect of high concentrations of gibberellin (500 μM) that affect gravitropism in protonemata of another moss, Ceratodon purpureus [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, some older reports do exist, that GA-application on specific moss species may slightly enhance growth rates [ 14 , 15 ]. In addition GA-application may interfere with gravitropism in the mosses Ceratodon purpureus [ 16 ] and Pottia intermedia [ 17 ]. In fact, to date gibberellins have not been identified in mosses, and it was proposed that the hormonal signalling pathway developed later in land plant evolution [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

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Evolutionary conservation of plant gibberellin signalling pathway components

Vandenbussche

Fierro²,

Wiedemann

et al. 2007

BMC Plant Biol

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Background: Gibberellins (GA) are plant hormones that can regulate germination, elongation growth, and sex determination. They ubiquitously occur in seed plants. The discovery of gibberellin receptors, together with advances in understanding the function of key components of GA signalling in Arabidopsis and rice, reveal a fairly short GA signal transduction route. The pathway essentially consists of GID1 gibberellin receptors that interact with F-box proteins, which in turn regulate degradation of downstream DELLA proteins, suppressors of GA-controlled responses.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolutionary conservation of plant gibberellin signalling pathway components

Vandenbussche

Fierro²,

Wiedemann

et al. 2007

BMC Plant Biol

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“…Lateral redistribution of radiolabeled indole-3-acetic acid (IAA) has been measured in both shoots (Parker and Briggs, 1990) and roots (Young et al, 1990;Young and Evans, 1996), and the redistribution of IAA has been shown to precede differential growth (Parker and Briggs, 1990). Other plant hormones, specifically brassinosteroids (Kim et al, 2000), ethylene (Lee et al, 1990;PhilosophHadas et al, 1996;Madlung et al, 1999), cytokinin (Golan et al, 1996), and gibberellic acid (Moore and Dickey, 1985;Rood et al, 1987;Brock and Kaufman, 1988;Chaban et al, 1999) have been shown to also play a role in gravitropism. Reactive oxygen species may function as a downstream component in auxinmediated signal transduction (Joo et al, 2001).…”

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confidence: 99%

The Fast and Transient Transcriptional Network of Gravity and Mechanical Stimulation in the Arabidopsis Root Apex

et al. 2004

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Plant root growth is affected by both gravity and mechanical stimulation . A coordinated response to both stimuli requires specific and common elements. To delineate the transcriptional response mechanisms, we carried out whole-genome microarray analysis of Arabidopsis root apices after gravity stimulation (reorientation) and mechanical stimulation and monitored transcript levels of 22,744 genes in a time course during the first hour after either stimulus. Rapid, transient changes in the relative abundance of specific transcripts occurred in response to gravity or mechanical stimulation, and these transcript level changes reveal clusters of coordinated events. Transcriptional regulation occurs in the root apices within less than 2 min after either stimulus. We identified genes responding specifically to each stimulus as well as transcripts regulated in both signal transduction pathways. Several unknown genes were specifically induced only during gravitropic stimulation (gravity induced genes). We also analyzed the network of transcriptional regulation during the early stages of gravitropism and mechanical stimulation.Plants adapt their growth in response to environmental cues. Gravity is a constant force that guides the direction of plant growth. Mechanical stimuli such as wind, rain, and obstacles in the soil trigger changes in growth patterns (Braam and Davis, 1990;. Gravitropic and mechanical stimulation in the root are interactive processes, mutually influencing differential growth (Mullen et al., 2000;Fasano et al., 2002;. The mechanisms of sensing and signal transduction for either stimulus are not well understood, but it has been shown that the transcript levels of specific genes are regulated early during signal transduction after either stimulus Braam and Davis, 1990).It is widely accepted that gravitropic stimulation by reorientation is perceived by sedimentation of starchcontaining plastids (statoliths) in the columella cells of the root tip (Kiss et al., 1989(Kiss et al., , 1996Juniper et al., 1966;Blancaflor et al., 1998). Columella cells show differences in their contribution toward gravity perception and in the velocity of sedimentation of their statoliths (Blancaflor et al., 1998). While complete sedimentation of the statoliths requires at least 5 min (Blancaflor et al., 1998;MacCleery and Kiss, 1999), the presentation time (duration of the stimulus that is required to establish a response) was estimated at only approximately 1 min for wild-type Arabidopsis root tips (Blancaflor et al., 1998). Statolith sedimentation is postulated to disrupt the actin-based cytoskeletal network and its links to plasma membrane receptors in some regions of the cell cortex (Yoder et al., 2001). Other groups hypothesized that statoliths are directly connected to the cytoskeleton, activating membrane proteins anchored to the filaments upon dislocation or activation of mechanosensitive ion channels (Evans et al., 1986;Pickard and Ding, 1993;Collings et al., 2001;Blancaflor, 2002).The transduction of the physical alt...

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“…For example, specific inhibitor of GA biosynthesis (2S,3S) paclobutrazol induced cortical MT misorien tation in the meristematic cells and especially in the root quiescent center that indicates the importance of GA at the early stages of root formation [48]. GA inhibits gravitropism, disturbs MT orientation, induces amyloplast movement and apical swelling of Ceratodon purpureus protonemata [49].…”

Section: Cytokinin Impact On Cytoskeletonmentioning

confidence: 99%

Effects of phytohormones on the cytoskeleton of the plant cell

Blume

Krasylenko

Yemets

2012

Russ J Plant Physiol

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This review highlights the effects of "classic" phytohormones (auxins, cytokinins, gibberellins, abscisic acid, ethylene, and brassinosteroids) and also of important signaling molecules, such as jasmonic acid, strigolactones, and nitric oxide, on the main components of the plant cytoskeleton, microtubules and microfilaments. The effects of these growth regulators on orientation and organization of microtubules and actin filaments, realization of cytoskeleton dependent processes, expression of tubulin and actin genes, and interaction of various phytohormones in their influence on the cytoskeleton are discussed.

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The gravireaction of Ceratodon protonemata treated with gibberellic acid

Cited by 6 publications

References 7 publications

Evolutionary conservation of plant gibberellin signalling pathway components

Evolutionary conservation of plant gibberellin signalling pathway components

The Fast and Transient Transcriptional Network of Gravity and Mechanical Stimulation in the Arabidopsis Root Apex

Effects of phytohormones on the cytoskeleton of the plant cell

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