Abstract
Even though a number of studies have shown that UV-B radiation inhibits plant growth and regulates the cell cycle progress, little is known about the molecular and cellular mechanisms. Here, we developed a synchronous root-tip cell system to investigate expression changes of cell cycle marker genes and DNA damage under UV-B radiation. Expression analysis of cell cycle marker genes revealed that G1-to-S transition in root-tip cells was accomplished within 6 h. In the in vivo synchronous root-tip cells, high level of UV-B radiation (0.45 W m−2) induced expression changes of the cell cycle regulatory genes. Genes involved in G1-to-S transition, Histone H4 and E2Fa, were down-regulated by UV-B radiation during 2–6 h; whereas transcripts for KRP2, a negative regulator of G1-to-S transition, were up-regulated by UV-B at 2 h. The peak time for transcript level of CYCD3;1, a positive factor in G1-to-S transition, was delayed by UV-B radiation. Interestingly, a medium level of UV-B radiation (0.25 W m−2) did not change the expression of these genes in root tip cells from wild type. However, cell cycle regulatory genes were greatly affected in uvh1 mutant, which exhibited higher content of cyclobutane pyrimidine dimers (CPDs). Ascorbic acid treatment did not change the expression pattern of cell cycle regulatory genes that were affected by high-level UV-B. Our results implied that UV-B-induced DNA damage results in the delay of G1-to-S transition of plant cell cycle. UV-B-induced G1-to-S arrest may be a protective mechanism that prevents cells with damaged DNA from dividing and may explain the plant growth inhibition under increased solar UV-B radiation.
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Abbreviations
- AsA:
-
Ascorbic acid
- ATM:
-
Ataxia-telangiectasia mutated
- ATR:
-
Ataxia-telangiectasia and Rad3-related
- CDKs:
-
Cyclin-dependent kinases
- CPDs:
-
Cyclobutane pyrimidine dimers
- HU:
-
Hydroxyurea
- KRPs:
-
Kip-related proteins
- NAA:
-
1-naphthalene acetic acid
- NPA:
-
N-1-naphthylphthalamic acid
- ROS:
-
Reactive oxygen species
- XPF:
-
Xeroderma pigmentosum group F
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Acknowledgments
We thank Prof. Gareth Jenkins (University of Glasgow, UK) and Dr. Roman Ulm (University of Freiburg) for the critical reading of manuscript. This work was supported by the grants to Prof. Shaoshan Li from the National Natural Science Foundation of China [NSFC, No. 30470283 and No. 31070242], and the Research Fund for the Doctoral Program [20070574003] of Higher Education in China and the Scientific Research Foundation [2005-383] for the Returned Overseas Chinese Scholars, Ministry of Education, China.
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Jiang, L., Wang, Y., Björn, L.O. et al. UV-B-induced DNA damage mediates expression changes of cell cycle regulatory genes in Arabidopsis root tips. Planta 233, 831–841 (2011). https://doi.org/10.1007/s00425-010-1340-5
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DOI: https://doi.org/10.1007/s00425-010-1340-5