Corrigendum: How and why do root apices sense light under the soil surface?

Mo, Mei; Yokawa, Ken; Wan, Yinglang; Baluška, Frantǐsek

doi:10.3389/fpls.2015.00930

Cited by 4 publications

(5 citation statements)

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“…For a long time, plant biologists have been growing Arabidopsis seedlings on transparent Petri dishes with the roots exposed to light, an approach we designated as a traditional culture system (TCS). Using a TCS, plant roots that would naturally grow in darkness were instead exposed to light ( Figures S1A, B ), which is controversial in the field of root research (Xu et al, 2013; Yokawa et al, 2013; Mo et al, 2015). To better understand the natural RSA of a plant, various approaches have been developed to mimic natural conditions (Xu et al, 2013; Yokawa et al, 2013; Silva-Navas et al, 2015; Lee et al, 2016; Sakaguchi and Watanabe, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…In nature, the roots of most terrestrial plants grow underground in darkness and grow away from light in a process known as negative phototropism. It has been reported that all photoreceptors are expressed in the roots to sense external light changes (Yokawa et al, 2014; Mo et al, 2015); therefore, many researchers have argued that investigating root development in transparent Petri dishes is inappropriate (Han et al, 2015; Mo et al, 2015). Recently, several improved cultural systems have been developed to study root development.…”

Section: Discussionmentioning

confidence: 99%

“…Light has largely been neglected as an environmental factor controlling RSA since the root systems of most terrestrial plants remain underground in darkness (Osmont et al, 2007; Bellini et al, 2014). Intriguingly, the genes encoding photoreceptors are expressed in the roots, enabling them to detect ambient light and trigger downstream responses that mediate root tropism and elongation in the soil (Galen et al, 2007; Salisbury et al, 2007; Mo et al, 2015; Van Gelderen et al, 2018b). For instance, red light was found to activate the phytochrome A (phyA)- and phyB-mediated signal transduction pathways in the root and dramatically inhibit root elongation in etiolated seedlings (Correll and Kiss, 2005).…”

Section: Introductionmentioning

confidence: 99%

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HY5 Contributes to Light-Regulated Root System Architecture Under a Root-Covered Culture System

Zhang

Wang

et al. 2019

Front. Plant Sci.

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Light is essential for plant organogenesis and development. Light-regulated shoot morphogenesis has been extensively studied; however, the mechanisms by which plant roots perceive and respond to aboveground light are largely unknown, particularly because the roots of most terrestrial plants are usually located underground in darkness. To mimic natural root growth conditions, we developed a root-covered system (RCS) in which the shoots were illuminated and the plant roots could be either exposed to light or cultivated in darkness. Using the RCS, we observed that root growth of wild-type plants was significantly promoted when the roots were in darkness, whereas it was inhibited by direct light exposure. This growth change seems to be regulated by ELONGATED HYPOCOTYL 5 (HY5), a master regulator of photomorphogenesis. Light was found to regulate HY5 expression in the roots, while a HY5 deficiency partially abolished the inhibition of growth in roots directly exposed to light, suggesting that HY5 expression is induced by direct light exposure and inhibits root growth. However, no differences in HY5 expression were observed between illuminated and dark-grown cop1 roots, indicating that HY5 may be regulated by COP1-mediated proteasome degradation. We confirmed the crucial role of HY5 in regulating root development in response to light under soil-grown conditions. A transcriptomic analysis revealed that light controls the expression of numerous genes involved in phytohormone signaling, stress adaptation, and metabolic processes in a HY5-dependent manner. In combination with the results of the flavonol quantification and exogenous quercetin application, these findings suggested that HY5 regulates the root response to light through a complex network that integrates flavonol biosynthesis and reactive oxygen species signaling. Collectively, our results indicate that HY5 is a master regulator of root photomorphogenesis.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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HY5 Contributes to Light-Regulated Root System Architecture Under a Root-Covered Culture System

Zhang

Wang

et al. 2019

Front. Plant Sci.

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“…Since the pioneering work of Charles and Francis Darwin, phototropism has been widely used to investigate how plants alter their growth in response to a directional light stimulus (Christie and Murphy, 2013 ). Shoot phototropism is typically positive leading to growth toward the light (Briggs, 2014 ; Liscum et al, 2014 ; Fankhauser and Christie, 2015 ), whereas roots frequently show negative phototropism triggering growth away from the light (Kutschera and Briggs, 2012 ; Mo et al, 2015 ). Shoot phototropism serves to optimize light capture in low light environments and increase photosynthetic productivity (Fankhauser and Christie, 2015 ), whereas root phototropism can serve to anchor the root system and provide support for the shoot (Kutschera and Briggs, 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Phytochrome A Mediates Blue-Light Enhancement of Second-Positive Phototropism in Arabidopsis

et al. 2016

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Hypocotyl phototropism of etiolated Arabidopsis seedlings is primarily mediated by the blue-light receptor kinase phototropin 1 (phot1). Phot1-mediated curvature to continuous unilateral blue light irradiation (0.5 μmol m−2 s−1) is enhanced by overhead pre-treatment with red light (20 μmol m−2 s−1 for 15 min) through the action of phytochrome (phyA). Here, we show that pre-treatment with blue light is equally as effective in eliciting phototropic enhancement and is dependent on phyA. Although blue light pre-treatment was sufficient to activate early phot1 signaling events, phot1 autophosphorylation in vivo was not found to be saturated, as assessed by subsequently measuring phot1 kinase activity in vitro. However, enhancement effects by red and blue light pre-treatment were not observed at higher intensities of phototropic stimulation (10 μmol m−2 s−1). Phototropic enhancement by red and blue light pre-treatments to 0.5 μmol m−2 s−1 unilateral blue light irradiation was also lacking in transgenic Arabidopsis where PHOT1 expression was restricted to the epidermis. Together, these findings indicate that phyA-mediated effects on phot1 signaling are restricted to low intensities of phototropic stimulation and originate from tissues other than the epidermis.

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“…The imbibition of the seed coats then resulted in the emergence of the plumule, and the cotyledons unfolded after 72 hours of the germinating period. Then, it was observed that the development of radicle and plumule started to elongate upon the indirect pathways to light [31]. The color of cotyledons changed from light yellowish to green as they were exposed to light.…”

Section: Resultsmentioning

confidence: 99%

Advanced Application of Electrospun Polycaprolactone Fibers for Seed Germination Activity

Fadil

Affandi

Ibrahim

et al. 2021

Advances in Polymer Technology

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The increasing intensity of coronavirus (COVID-19) spreading emphasizes the significant development in home food production to reduce the incoming socioeconomic impact from soaring food prices, supply chain fragility, and severe economic crisis. This preliminary study was initiated to demonstrate the possibility of using electrospun fibers as a potential substrate in the application of seed germination activity. The drive of this preliminary study was to integrate the electrospun nanofiber-based material in exploring the current surge in home food production via seed germination in order to introduce cheap source of food without being distracted by the pandemic impact in general. Mung bean (Vigna radiata L. Wilczek) was chosen as it is easy and fast to sprout. Four samples of poly (ε-caprolactone)- (PCL-) based fibers were prepared by means of electrospinning technique, with the optimized flow rate between 0.05 and 0.20 ml/min at a fixed distance of 10 cm needle tip to collector. Mung bean seeds were allowed to germinate on the fabricated electrospun PCL fibers for 96 hours. Our observations include germination percentage, seedling weight, radicle length, and plumule growth. The highest radicle length and plumule length of seedlings were 27.8 mm and 6.7 mm, respectively. There were no inhibitory effects on seed germination and minimal structural fragmentation of smaller diameter electrospun fibers as revealed by FESEM. These results show that the seeds were able to germinate on electrospun PCL fiber substrate, owing to the properties of high surface area and excellent fluid water uptake of PCL fibers.

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Corrigendum: How and why do root apices sense light under the soil surface?

Cited by 4 publications

References 1 publication

HY5 Contributes to Light-Regulated Root System Architecture Under a Root-Covered Culture System

HY5 Contributes to Light-Regulated Root System Architecture Under a Root-Covered Culture System

Phytochrome A Mediates Blue-Light Enhancement of Second-Positive Phototropism in Arabidopsis

Advanced Application of Electrospun Polycaprolactone Fibers for Seed Germination Activity

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