Elevated Carbon Dioxide Induces Stomatal Closure of Arabidopsis thaliana (L.) Heynh. Through an Increased Production of Nitric Oxide

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• 作者：Huan Wang ; Wendan Xiao ; Yaofang Niu ; Rushan Chai…
• 关键词：Arabidopsis ; Elevated CO2 ; Nitrate reductase ; Nitric oxide ; Nitric oxide synthase ; Stomata
• 刊名：Journal of Plant Growth Regulation
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：34
• 期：2
• 页码：372-380
• 全文大小：1,246 KB
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• 作者单位：Huan Wang (1)
  Wendan Xiao (1)
  Yaofang Niu (2)
  Rushan Chai (1)
  Chongwei Jin (2)
  Yongsong Zhang (1)
  
  1. Ministry of Education Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resource Science, Zhejiang University, Hangzhou, 310058, China
  2. Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, College of Environmental and Resource Science, Zhejiang University, Hangzhou, 310058, China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Cell Biology
  Agriculture
  Forestry
  
• 出版者：Springer New York
• ISSN：1435-8107

文摘

Elevated carbon dioxide (CO₂) has been shown to enhance the photosynthesis of plants, while inducing stomatal closure in leaves. Stomatal closure is always a key issue regarding plants-responses against stress under elevated CO₂. This paper examined the mechanism underlying CO₂ elevation-induced stomatal closure in Arabidopsis. Endogenous nitric oxide (NO) in guard cells was detected by the specific probe 4-amino-5-methylamino-2-7-difluorofluorescein diacetate. The Arabidopsis wild type, nitric oxide synthase (NOS) mutant atnos1, and nitrate reductase (NR) mutant nia1nia2 were used as experimental materials. The present study shows that elevated CO₂-induced NO accumulation in guard cells by 120?% and decreased the aperture of stomata by 32?% compared with ambient CO₂. CO₂ elevation-induced stomatal closure was reversed by scavenging NO. Here, we suggested that NO plays an important role in stomatal closure of Arabidopsis induced by elevated CO₂. The pharmacological and genetic evidence shows that both the NOS inhibitor _L-NAME and NR inhibitor tungstate significantly decreased NO accumulation in guard cells and inhibited stomatal closure, whereas the stomatal aperture of both the atnos1 and nia1nia2 mutants decreased slightly under elevated CO₂, indicated that both NOS-like and NR were involved in CO₂ elevation-induced NO accumulation. Therefore, we conclude from these findings that elevated CO₂ increases the level of NO through both NOS-like and NR, which then induces stomatal closure in Arabidopsis under elevated CO₂.