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Brazilian Journal of Botany

, Volume 40, Issue 2, pp 591–597 | Cite as

Exogenous salicylic acid-induced nitric oxide regulates leaf water condition through root osmoregulation of maize seedlings under drought stress

Short Communication

Abstract

Under drought stress, the role of nitric oxide (NO) in the regulation of leaf water condition by salicylic acid (SA) through root osmoregulation of maize (Zea mays L.) seedlings was investigated. The results showed that drought stress markedly increased the contents of NO, soluble sugar, proline, soluble protein, Na+, K+ and Ca2+, as well as the activity of plasmalemma H+-ATPase in roots, compared with control. However, drought stress significantly decreased root hydraulic conductivity and leaf relative water content (RWC). Exogenous SA under drought stress significantly increased above indicators, compared with drought stress alone. Above effects of SA were significantly inhibited by the pretreatment with NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO). Overall, the findings indicated that SA-induced NO participated in the regulation of leaf water condition through root osmoregulation of maize seedlings under drought stress.

Keywords

Drought tolerance Osmotic adjustment Signal molecule Water balance Zea mays 

Notes

Acknowledgements

Our study was funded by “Open project of Crop Science Characteristic Discipline of Henan Province” and “Key Project of Scientific Research of Higher Education Institution from Education Department of Henan Province (13A180302).”

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Botanical Society of Sao Paulo 2016

Authors and Affiliations

  1. 1.School of Life Science and TechnologyHenan Institute of Science and TechnologyXinxiangChina
  2. 2.Collaborative Innovation Center of Modern Biological BreedingXinxiangChina

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