Light-dependent control of redox balance and auxin biosynthesis in plants

Yokawa, Ken; Koshiba, Tomokazu; Baluška, Frantǐsek

doi:10.4161/psb.29522

Cited by 22 publications

(25 citation statements)

References 30 publications

(32 reference statements)

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“…In blue light region, there are many reported studies indicating that flavin-containing molecules immediately generate radicals and ROS in vivo by absorbing light ( Massey et al, 1969 ; Prolla and Mehlhorn, 1990 ; Hockberger et al, 1999 ). Intriguingly, it was reported that irradiating blue light to tryptophan solution in vivo produced a precursor of auxin, indole-3-acetaldehyde , and it might be relevant to rapid phototropism in plants ( Koshiba et al, 1993 ; Yokawa et al, 2014a ). We also hypothesized that internalized pectin via endocytosis can also be a factor controlling ROS homeostasis under UV-B environment ( Yokawa and Baluška, 2015 ).…”

Section: Discussionmentioning

confidence: 99%

UV-B Induced Generation of Reactive Oxygen Species Promotes Formation of BFA-Induced Compartments in Cells of Arabidopsis Root Apices

2016

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UV-B radiation is an important part of the electromagnetic spectrum emitted by the sun. For much of the period of biological evolution organisms have been exposed to UV radiation, and have developed diverse mechanisms to cope with this potential stress factor. Roots are usually shielded from exposure to UV by the surrounding soil, but may nevertheless be exposed to high energy radiation on the soil surface. Due to their high sensitivity to UV-B radiation, plant roots need to respond rapidly in order to minimize exposure on the surface. In addition to root gravitropism, effective light perception by roots has recently been discovered to be essential for triggering negative root phototropism in Arabidopsis. However, it is not fully understood how UV-B affects root growth and phototropism. Here, we report that UV-B induces rapid generation of reactive oxygen species which in turn promotes the formation of BFA-induced compartments in the Arabidopsis root apex. During unilateral UV-B irradiation of roots changes in auxin concentration on the illuminated side have been recorded. In conclusion, UV-B-induced and ROS-mediated stimulation of vesicle recycling promotes root growth and induces negative phototropism.

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Section: Discussionmentioning

confidence: 99%

UV-B Induced Generation of Reactive Oxygen Species Promotes Formation of BFA-Induced Compartments in Cells of Arabidopsis Root Apices

2016

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“…Interestingly, precursor of endogenous auxin, indole-3-acetaldehyde (IAAld), is produced non-enzymatically in vitro by illumination of tryptophan in the presence of flavin which is abundant in living plant cells ( Koshiba et al, 1993 ). Recently, we have proposed close links between the redox status and auxin (IAA) biosynthesis in plants ( Yokawa et al, 2014 ). Taken together, it is obvious that roots are extraordinarily sensitive to light exposure due to their inherent evolutionary optimization for the underground life.…”

Section: From Actin Cytoskeleton Via Pin2 Recycling To Salt Avoidanmentioning

confidence: 99%

“…Finally, the key transcription factor of light signaling HY5 requires strigolactones in order to stimulate Arabidopsis seed germination during thermoinhibiton ( Toh et al, 2012 ). Light also induces auxin biosynthesis via photoexcitation of flavins ( Koshiba et al, 1993 ; Yokawa et al, 2014 ).…”

Section: Light Signal Transduction Via Cop1 and Hy5 Is Integrated Witmentioning

confidence: 99%

Light as stress factor to plant roots â€“ case of root halotropism

et al. 2014

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Despite growing underground, largely in darkness, roots emerge to be very sensitive to light. Recently, several important papers have been published which reveal that plant roots not only express all known light receptors but also that their growth, physiology and adaptive stress responses are light-sensitive. In Arabidopsis, illumination of roots speeds-up root growth via reactive oxygen species-mediated and F-actin dependent process. On the other hand, keeping Arabidopsis roots in darkness alters F-actin distribution, polar localization of PIN proteins as well as polar transport of auxin. Several signaling components activated by phytohormones are overlapping with light-related signaling cascade. We demonstrated that the sensitivity of roots to salinity is altered in the light-grown Arabidopsis roots. Particularly, light-exposed roots are less effective in their salt-avoidance behavior known as root halotropism. Here we discuss these new aspects of light-mediated root behavior from cellular, physiological and evolutionary perspectives.

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“…A number of factors involved in the light signaling pathway, such as reactive oxygen species, abscisic acid, and sugar, have been to found to affect root development [15][16][17]. Indole-3acetic acid (IAA) is synthesized in vigorous organs under light regulation [18,19]. Depending on the exposure to light, IAA plays a critical role in the developmental process of adventitious roots (ARs), including induction, development, and expression of roots [20,21].…”

Section: Introductionmentioning

confidence: 99%

Gene expression profiling reveals the effects of light on adventitious root formation in lotus seedlings (Nelumbo nucifera Gaertn.)

Cheng¹,

Han²,

Minrong³

et al. 2020

BMC Genomics

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Background Lotus is an aquatic horticultural crop that is widely cultivated in most regions of China and is used as an important off-season vegetable. The principal root of lotus is degenerated, and adventitious roots (ARs) are irreplaceable for plant growth. We found that no ARs formed under darkness and that exposure to high-intensity light significantly promoted the development of root primordia. Four differential expression libraries based on three light intensities were constructed to monitor metabolic changes, especially in indole-3-acetic acid (IAA) and sugar metabolism. Results AR formation was significantly affected by light, and high light intensity accelerated AR development. Metabolic changes during AR formation under different light intensities were evaluated using gene expression profiling by high-throughput tag-sequencing. More than 2.2 × 104 genes were obtained in each library; the expression level of most genes was between 0.01 and 100 (FPKF value). Libraries constructed from plants grown under darkness (D/CK), under 5000 lx (E/CK), and under 20,000 lx (F/CK) contained 1739, 1683, and 1462 upregulated genes and 1533, 995, and 834 downregulated genes, respectively, when compared to those in the initial state (CK). Additionally, we found that 1454 and 478 genes had altered expression in a comparison of libraries D/CK and F/CK. Gene transcription between libraries D/F ranged from a 5-fold decrease to a 5-fold increase. Twenty differentially expressed genes (DEGs) were involved in the signal transduction pathway, 28 DEGs were related to the IAA response, and 35 DEGs were involved in sugar metabolism. We observed that the IAA content was enhanced after seed germination, even in darkness; this was responsible for AR formation. We also observed that sucrose could eliminate the negative effect of 150 μMol IAA during AR development. Conclusions AR formation was regulated by IAA, even in the dark, where induction and developmental processes could also be completed. In addition, 36 genes displayed altered expression in carbohydrate metabolism and ucrose metabolism was involved in AR development (expressed stage) according to gene expression and content change characteristics.

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Light-dependent control of redox balance and auxin biosynthesis in plants

Cited by 22 publications

References 30 publications

UV-B Induced Generation of Reactive Oxygen Species Promotes Formation of BFA-Induced Compartments in Cells of Arabidopsis Root Apices

UV-B Induced Generation of Reactive Oxygen Species Promotes Formation of BFA-Induced Compartments in Cells of Arabidopsis Root Apices

Light as stress factor to plant roots â€“ case of root halotropism

Gene expression profiling reveals the effects of light on adventitious root formation in lotus seedlings (Nelumbo nucifera Gaertn.)

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