Abstract
The biomasses, rate of apparent nitric oxide (NO)-release, nitric oxide synthase (NOS) activity as well as β-d-endo and exo-glucanase activity of the cell wall were analyzed and determined in the roots of maize seedlings. It was found that rhizospheric treatments of 2-phenyl-4,4,5,5-tetramethlimida-zoline-l-oxyl-3-oxide (PTIO), a NO scavenger, and radiation of enhanced ultraviolet-B (UV-B) to aerial parts of the seedling markedly inhibited the rate of NO release in roots, raised the activity of β-d-endo and exo-glucanase, and increased the biomasses of roots. The patent inhibitor, N-nitro-l-arginine (LNNA), of NOS was unable to inhibit NOS activity and NO generation. Inversely, reactive oxygen species (ROS) eliminator, N-acetyl-cysteine (NAC), stimulated the rate of NO release. There is no relationship between NOS activity and the rate of NO release. The latter showed a positive correlation with nitrate reductase (NR) activity, whereas it showed a negative correlation with the bio-masses and the activity of β-d-endo and exo-glucanase. All results implicated that NO was a by-product generated by NR catalysis, whereas NR activity was sensitively repressed by the systemic signal network (involved in ROS) induced by enhanced UV-B. It indicated that the downstream signal molecule of enhanced UV-B light is probably ROS which decreased NO generation through inhibiting NR activity. The endogenous NO generated by NR catalysis is perhaps such a messenger for restraining β-d-endo and exo-glucanase activity that the root growth was retarded.
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Abbreviations
- CK:
-
Normal level
- LNNA:
-
N-nitro-l-arginine
- NAC:
-
N-acetyl-cysteine
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- NR:
-
Nitrate reductase
- PTIO:
-
2-phenyl-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide
- ROS:
-
Reactive oxygen species
- SNP:
-
Sodium nitroprusside
- UV-B:
-
Ultraviolet-B
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This work was supported by The Gansu Province Natural Science Fund (3ZS051-A25-067) and the Natural Science Fund of China (No: 30670319).
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Communicated by G. Bartosz.
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Zhang, M., Liu, G., Chen, T. et al. Cascade transduction and production of the light-nitric oxide signal from shoots to roots in maize seedlings exposed to enhanced UV-B radiation. Acta Physiol Plant 31, 175–185 (2009). https://doi.org/10.1007/s11738-008-0218-7
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DOI: https://doi.org/10.1007/s11738-008-0218-7