Developmental reprogramming by UV-B radiation in plants

Dotto, Marcela C.; Casati, Paula

doi:10.1016/j.plantsci.2017.09.006

Cited by 68 publications

(42 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrary, when the levels of harmful wavelengths increase, plants will tend to avoid extensive exposure to solar radiation. An increase in UV-B, for instance, will lead to the downward curling of the leaves (also known as epinasty), a reduction of the leaf area and an increase in the density of trichomes ( Dotto and Casati, 2017 ). The effect of UV-B on leaf size is species-specific but generally caused by both a reduction in cell proliferation and an increase in cell expansion.…”

Section: How Leaves Adapt To Changes In Environmental Variables?mentioning

confidence: 99%

Mechanisms Underlying the Environmentally Induced Plasticity of Leaf Morphology

2018

View full text Add to dashboard Cite

The primary function of leaves is to provide an interface between plants and their environment for gas exchange, light exposure and thermoregulation. Leaves have, therefore a central contribution to plant fitness by allowing an efficient absorption of sunlight energy through photosynthesis to ensure an optimal growth. Their final geometry will result from a balance between the need to maximize energy uptake while minimizing the damage caused by environmental stresses. This intimate relationship between leaf and its surroundings has led to an enormous diversification in leaf forms. Leaf shape varies between species, populations, individuals or even within identical genotypes when those are subjected to different environmental conditions. For instance, the extent of leaf margin dissection has, for long, been found to inversely correlate with the mean annual temperature, such that Paleobotanists have used models based on leaf shape to predict the paleoclimate from fossil flora. Leaf growth is not only dependent on temperature but is also regulated by many other environmental factors such as light quality and intensity or ambient humidity. This raises the question of how the different signals can be integrated at the molecular level and converted into clear developmental decisions. Several recent studies have started to shed the light on the molecular mechanisms that connect the environmental sensing with organ-growth and patterning. In this review, we discuss the current knowledge on the influence of different environmental signals on leaf size and shape, their integration as well as their importance for plant adaptation.

show abstract

Section: How Leaves Adapt To Changes In Environmental Variables?mentioning

confidence: 99%

Mechanisms Underlying the Environmentally Induced Plasticity of Leaf Morphology

2018

View full text Add to dashboard Cite

show abstract

“…This reduction can be a consequence of an inhibition of cell division and/or a decrease in cell expansion (Hectors et al ., ), which reflects differences in experimental conditions. For example, stress‐inducing UV‐B conditions that produce DNA damage can inhibit cell proliferation, while lower doses and/or chronic UV‐B irradiation can result in both inhibition of cell proliferation and expansion (for a revision, see Dotto and Casati, ). Previously, we demonstrated that in Arabidopsis, at UV‐B intensities that can produce accumulation of DNA damage, the reduction in leaf area was a result of the inhibition of cell proliferation mediated by miR396, a microRNA that downregulates the expression of Growth Regulating Factors (GRF) transcription factors (TFs), among other targets (Debernardi et al ., ; Casadevall et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Arabidopsis E2Fc is required for the DNA damage response under UV‐B radiation epistatically over the microRNA396 and independently of E2Fe

et al. 2019

Self Cite

View full text Add to dashboard Cite

UV-B radiation inhibits plant growth, and this inhibition is, to a certain extent, regulated by miR396mediated repression of Growth Regulating Transcription factors (GRFs). Moreover, E2Fe transcription factor also modulates Arabidopsis leaf growth. Here, we provide evidence that, at UV-B intensities that induce DNA damage, E2Fc participates in the inhibition of cell proliferation. We demonstrate that E2Fc-deficient plants show a lower inhibition of leaf size under UV-B conditions that damage DNA, decreased cell death after exposure and altered SOG1 and ATR expression. Interestingly, the previously reported participation of E2Fe in UV-B responses, which is a transcriptional target of E2Fc, is independent and different from that described for E2Fc. Conversely, we here demonstrate that E2Fc has an epistatic role over the miR396 pathway under UV-B conditions. Finally, we show that inhibition of cell proliferation by UV-B is independent of the regulation of class II TCP transcription factors. Together, our results demonstrate that E2Fc is required for miR396 activity on cell proliferation under UV-B, and that its role is independent of E2Fe, probably modulating DNA damage responses through the regulation of SOG1 and ATR transcript levels.

show abstract

“…UV RESISTANT LOCUS 8 (UVR8) is the only UV-B specific photoreceptor identified (Jenkins, 2014;Rizzini et al, 2011), which has been shown to enhance Arabidopsis plant survival under low UV-B levels (Favory et al, 2009;Rizzini et al, 2011). These responses require the integration of different signalling pathways, which usually involve primary changes at the gene expression level, some of which have been shown to rely on UVR8 action (Casati, 2013;Casati & Walbot, 2003;Dotto & Casati, 2017). The most common effects of UV-B on plant physiology, growth, and development range from specific modifications on primary metabolic functions, such as a decrease in photosynthetic activity, changes in pigment composition, and enzyme activities, to more general effects such as the inhibition of cell proliferation (Casadevall, Rodriguez, Debernardi, Palatnik, & Casati, 2013), alterations in flowering time, and reproduction (Mackerness, 2000).…”

Section: Introductionmentioning

confidence: 99%

UV‐B radiation delays flowering time through changes in the PRC2 complex activity and miR156 levels in Arabidopsis thaliana

Dotto

Gómez

Soto

2018

Plant Cell & Environment

Self Cite

View full text Add to dashboard Cite

UV-B is a high-energy component of the solar radiation perceived by the plant and induces a number of modifications in plant growth and development, including changes in flowering time. However, the molecular mechanisms underlying these changes are largely unknown. In the present work, we demonstrate that Arabidopsis plants grown under white light supplemented with UV-B show a delay in flowering time, and this developmental reprogramming is mediated by the UVR8 photoreceptor. Using a combination of gene expression analyses and UV-B irradiation of different flowering mutants, we gained insight into the pathways involved in the observed flowering time delay in UV-B-exposed Arabidopsis plants. We provide evidence that UV-B light downregulates the expression of MSI1 and CLF, two of the components of the polycomb repressive complex 2, which in consequence drives a decrease in H3K27me3 histone methylation of MIR156 and FLC genes. Modification in the expression of several flowering time genes as a consequence of the decrease in the polycomb repressive complex 2 activity was also determined. UV-B exposure of flowering mutants supports the involvement of this complex in the observed delay in flowering time, mostly through the age pathway.

show abstract

Developmental reprogramming by UV-B radiation in plants

Cited by 68 publications

References 76 publications

Mechanisms Underlying the Environmentally Induced Plasticity of Leaf Morphology

Mechanisms Underlying the Environmentally Induced Plasticity of Leaf Morphology

Arabidopsis E2Fc is required for the DNA damage response under UV‐B radiation epistatically over the microRNA396 and independently of E2Fe

UV‐B radiation delays flowering time through changes in the PRC2 complex activity and miR156 levels in Arabidopsis thaliana

Contact Info

Product

Resources

About