Signalling for developmental plasticity

Casal, Jorge J.; Fankhauser, Christian; Coupland, George; Blázquez, Miguel Á.

doi:10.1016/j.tplants.2004.04.007

Cited by 116 publications

(65 citation statements)

References 57 publications

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“…A striking example of the plasticity of plant development (Casal et al, 2004;Matesanz et al, 2010;Nicotra et al, 2010) is revealed when a seedling emerges through the soil. In the absence of light, the hypocotyl elongates whereas cotyledons remain closed.…”

Section: Introductionmentioning

confidence: 99%

COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1- and PIN2-dependent auxin transport in Arabidopsis

et al. 2012

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SUMMARYWhen a plant germinates in the soil, elongation of stem-like organs is enhanced whereas leaf and root growth is inhibited. How these differential growth responses are orchestrated by light and integrated at the organismal level to shape the plant remains to be elucidated. Here, we show that light signals through the master photomorphogenesis repressor COP1 to coordinate root and shoot growth in Arabidopsis. In the shoot, COP1 regulates shoot-to-root auxin transport by controlling the transcription of the auxin efflux carrier gene PIN-FORMED1 (PIN1), thus appropriately tuning shoot-derived auxin levels in the root. This in turn directly influences root elongation and adapts auxin transport and cell proliferation in the root apical meristem by modulating PIN1 and PIN2 intracellular distribution in the root in a COP1-dependent fashion, thus permitting a rapid and precise tuning of root growth to the light environment. Our data identify auxin as a long-distance signal in developmental adaptation to light and illustrate how spatially separated control mechanisms can converge on the same signaling system to coordinate development at the whole plant level.

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Section: Introductionmentioning

confidence: 99%

COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1- and PIN2-dependent auxin transport in Arabidopsis

et al. 2012

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“…Proper regulation of these two developmental stages is important for plants to optimize their growth and to ensure their success in response to environmental cues (for review, see Casal et al, 2004). Seedlings undergo a sophisticated transcriptomic adjustment during the transition from skotomorphogenesis to photomorphogenesis (for review, see Casal and Yanovsky, 2005).…”

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confidence: 99%

COP1-Mediated Degradation of BBX22/LZF1 Optimizes Seedling Development in Arabidopsis

2011

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Light regulates multiple aspects of growth and development in plants. Transcriptomic changes govern the expression of signaling molecules with the perception of light. Also, the 26S proteasome regulates the accumulation of positive and negative regulators for optimal growth of Arabidopsis (Arabidopsis thaliana) in the dark, light, or light/dark cycles. BBX22, whose induction is both light regulated and HY5 dependent, is a positive regulator of deetiolation in Arabidopsis. We found that during skotomorphogenesis, the expression of BBX22 needs to be tightly regulated at both transcriptional and posttranslational levels. During photomorphogenesis, the expression of BBX22 transiently accumulates to execute its roles as a positive regulator. BBX22 protein accumulates to a higher level under short-day conditions and functions to inhibit hypocotyl elongation. The proteasome-dependent degradation of BBX22 protein is tightly controlled even in plants overexpressing BBX22. An analysis of BBX22 degradation kinetics shows that the protein has a short half-life under both dark and light conditions. COP1 mediates the degradation of BBX22 in the dark. Although dispensable in the dark, HY5 contributes to the degradation of BBX22 in the light. The constitutive photomorphogenic development of the cop1 mutant is enhanced in cop1BBX22ox plants, which show a short hypocotyl, high anthocyanin accumulation, and expression of light-responsive genes. Exaggerated light responsiveness is also observed in cop1BBX22ox seedlings grown under short-day conditions. Therefore, the proper accumulation of BBX22 is crucial for plants to maintain optimal growth when grown in the dark as well as to respond to seasonal changes in daylength.

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“…Plants also adjust their growth and development in response to exogenous signals such as fluctuations of the environment that correlate with stress conditions (Casal et al 2004). For instance, the control of flowering time by photoperiod is a clear example of a response to an environmental condition that correlates with the occurrence of a favorable season, where stress events are less likely.…”

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confidence: 99%

Suppression of Pleiotropic Effects of Functional CRYPTOCHROME Genes by TERMINAL FLOWER 1

et al. 2008

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TERMINAL FLOWER 1 (TFL1) encodes a protein with similarity to animal phosphatidylethanolaminebinding proteins and is required for normal trafficking to the protein storage vacuole. In Arabidopsis thaliana the tfl1 mutation produces severe developmental abnormalities. Here we show that most aspects of the tfl1 phenotype are lost in the cry1 cry2 double-mutant background lacking cryptochromes 1 and 2. The inhibition of hypocotyl growth by light is reduced in the tfl1 mutant but this effect is absent in the cry1 or cry2 mutant background. Although the promotion of flowering under long rather than short days is a key function of cryptochromes, in the tfl1 background, cryptochromes promoted flowering under short days. Thus, normal CRY control of photoperiod-dependent flowering and hypocotyl growth inhibition requires a functional TFL1 gene.

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Signalling for developmental plasticity

Cited by 116 publications

References 57 publications

COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1- and PIN2-dependent auxin transport in Arabidopsis

COP1 mediates the coordination of root and shoot growth by light through modulation of PIN1- and PIN2-dependent auxin transport in Arabidopsis

COP1-Mediated Degradation of BBX22/LZF1 Optimizes Seedling Development in Arabidopsis

Suppression of Pleiotropic Effects of Functional CRYPTOCHROME Genes by TERMINAL FLOWER 1

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