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Protective Effect of Nitric Oxide (NO) against Oxidative Damage in Larix gmelinii Seedlings under Ultraviolet-B Irradiation

1
College of Forestry, Northeast Forestry University, No. 26 Hexing Road Xiangfang District, Harbin 150040, China
2
Key Laboratory of Forest Plant Ecology, Northeast Forestry University, No. 26 Hexing Road Xiangfang District, Harbin 150040, China
*
Author to whom correspondence should be addressed.
These authors contributed equally to this paper.
Academic Editors: Maarten Nieuwenhuis and Timothy A. Martin
Forests 2016, 7(11), 251; https://doi.org/10.3390/f7110251
Received: 12 August 2016 / Revised: 14 October 2016 / Accepted: 18 October 2016 / Published: 26 October 2016
Ultraviolet-B (UV-B) stress appears to be more striking than other research works because of the thin ozone layer. The protective influence of an exogenous nitric oxide donor and sodium nitroprusside (SNP) on the growth properties of Larix gmelinii seedlings was investigated under ultraviolet-B radiation conditions. The results indicated that 0.1 mM SNP could effectively alleviate the damage caused by ultraviolet-B radiation, and improved the seedling growth properties, the relative water content, and photosynthetic pigment content in leaves. Additionally, the photosynthetic capacity and antioxidant enzyme activity were increased during the exposure. On the contrary, the damage caused by active oxygen was decreased in SNP-treated seedling leaves. The damage caused by ultraviolet-B radiation was slightly reduced after treating with 0.01 mM SNP. Nevertheless, treatment with 0.5 mM SNP had a negative effect under ultraviolet-B radiation. Furthermore, supplementing NO (nitric oxide) improved the photosynthetic capacity and antioxidant enzyme activity and alleviated the damage of caused by active oxygen. The best effective concentration of SNP was 0.1 mM. Therefore, a suitable amount of exogenous NO can protect the Larix gmelinii seedlings and increase their tolerance to ultraviolet-B radiation. View Full-Text
Keywords: Ultraviolet-B; sodium nitroprusside; Larix gmelinii seedlings; photosynthetic capacity; antioxidant enzyme activity Ultraviolet-B; sodium nitroprusside; Larix gmelinii seedlings; photosynthetic capacity; antioxidant enzyme activity
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MDPI and ACS Style

Hu, H.; Zhou, Z.; Sun, X.; Zhang, Z.; Meng, Q. Protective Effect of Nitric Oxide (NO) against Oxidative Damage in Larix gmelinii Seedlings under Ultraviolet-B Irradiation. Forests 2016, 7, 251.

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