Elevated nitrogen metabolism and nitric oxide production are involved in Arabidopsis resistance to acid rain
2018
Qiao, Fang | Zhang, Xi-Min | Liu, Xiang | Chen, Juan | Hu, Wen-Jun | Liu, Ting-Wu | Liu, Ji-Yun | Zhu, Chun-Quan | Ghoto, Kabir | Zhu, Xue-Yi | Zheng, Hai-Lei
Acid rain (AR) can induce great damages to plants and could be classified into different types according to the different SO42-/NO3− ratio. However, the mechanism of plants’ responding to different types of AR has not been elucidated clearly. Here, we found that nitric-rich simulated AR (N-SiAR) induced less leaves injury as lower necrosis percentage, better physiological parameters and reduced oxidative damage in the leaves of N-SiAR treated Arabidopsis thaliana compared with sulfate and nitrate mixed (SN-SiAR) or sulfuric-rich (S-SiAR) simulated AR treated ones. Of these three types of SiAR, N-SiAR treated Arabidopsis maintained the highest of nitrogen (N) content, nitrate reductase (NR) and nitrite reductase (NiR) activity as well as N metabolism related genes expression level. Nitric oxide (NO) content showed that N-SiAR treated seedlings had a higher NO level compared to SN-SiAR or S-SiAR treated ones. A series of NO production and elimination related reagents and three NO production-related mutants were used to further confirm the role of NO in regulating acid rain resistance in N-SiAR treated Arabidopsis seedlings. Taken together, we concluded that an elevated N metabolism and enhanced NO production are involved in the tolerance to different types of AR in Arabidopsis.
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