Abstract
Ultraviolet-B (UV-B) radiation inhibits root system growth, however, the influence of UV-B radiation on the regulation of root development remains unclear. Here, we investigated the effects of UV-B radiation on root growth and metabolism in Arabidopsis using physiological, pharmacological, and transcriptome approaches. Our previous study has demonstrated that UV-B radiation depresses auxin accumulation in roots by reducing auxin biosynthesis, transport, and response. In this study, we found that UV-B radiation inhibited primary root (PR) growth by inducing root tip cell death and thereby disrupting cell division and elongation in root tips. The destructed root structure and distorted auxin flow caused by UV-B-induced root tip cell death also led to a reduced auxin accumulation in roots. Supplementation with an auxin α-naphthylacetic acid alleviated UV-B-repressed PR growth and further supported a notion that auxin is involved in UV‑B-repressed PR growth. The UV-B radiation downregulated the expression of genes encoding the enzymes or regulators of the biosyntheses and degradations of the structural constituents of cell wall and genes involved in wax, cutin, and suberin biosyntheses, thereby repressing root system growth and development. The UV-B radiation also markedly repressed photosynthesis-related gene expression in roots, a non-photosynthetic organ. Taken together, this study suggests that UV-B radiation affects root growth by inducing cell death in root tips and reprogramming metabolism in roots.
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Claims 6
Claim · model-written summary
UV-B radiation inhibited primary root growth by inducing root tip cell death in Arabidopsis.
- Taxon
- Arabidopsis
Arabidopsise0 - Organ / stage
- primary root (PR)e1
- Treatment
- UV-B radiatione1
- Outcome
- primary root (PR) growthe1
- Direction
- inhibitede1
- Qualifier
- inducing root tip cell deathe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth and metabolism in Arabidopsis”
e1“UV-B radiation inhibited primary root (PR) growth by inducing root tip cell death”
Claim · model-written summary
UV-B-induced root tip cell death led to reduced auxin accumulation in Arabidopsis roots.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- UV-B-induced root tip cell deathe2
- Outcome
- auxin accumulation in rootse2
- Direction
- reducede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth and metabolism in Arabidopsis”
e2“The destructed root structure and distorted auxin flow caused by UV-B-induced root tip cell death also led to a reduced auxin accumulation in roots”
Claim · model-written summary
Supplementation with the auxin alpha-naphthylacetic acid alleviated the UV-B-repressed primary root growth of Arabidopsis.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- Supplementation with an auxin α-naphthylacetic acide3
- Outcome
- PR growthe3
- Direction
- alleviatede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth and metabolism in Arabidopsis”
e3“Supplementation with an auxin α-naphthylacetic acid alleviated UV-B-repressed PR growth”
Claim · model-written summary
UV-B radiation downregulated the expression of cell wall biosynthesis and degradation genes in Arabidopsis roots.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- UV-B radiatione4
- Outcome
- the expression of genes encoding the enzymes or regulators of the biosyntheses and degradations of the structural constituents of cell walle4
- Direction
- downregulatede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth and metabolism in Arabidopsis”
e4“The UV-B radiation downregulated the expression of genes encoding the enzymes or regulators of the biosyntheses and degradations of the structural constituents of cell wall and genes involved in wax, cutin, and suberin biosyntheses”
Claim · model-written summary
UV-B radiation downregulated genes involved in wax, cutin and suberin biosyntheses in Arabidopsis roots.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- UV-B radiatione4
- Outcome
- genes involved in wax, cutin, and suberin biosynthesese4
- Direction
- downregulatede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth and metabolism in Arabidopsis”
e4“The UV-B radiation downregulated the expression of genes encoding the enzymes or regulators of the biosyntheses and degradations of the structural constituents of cell wall and genes involved in wax, cutin, and suberin biosyntheses”
Claim · model-written summary
UV-B radiation markedly repressed photosynthesis-related gene expression in Arabidopsis roots.
- Taxon
- ArabidopsisArabidopsise0
- Organ / stage
- rootse5
- Treatment
- UV-B radiatione5
- Outcome
- photosynthesis-related gene expressione5
- Direction
- repressede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root growth and metabolism in Arabidopsis”
e5“The UV-B radiation also markedly repressed photosynthesis-related gene expression in roots”
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