期刊
PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS
卷 25, 期 1, 页码 177-187出版社
SPRINGER
DOI: 10.1007/s12298-018-0611-7
关键词
Antioxidant enzymes; Biological yield; Drought stress; Soluble proteins; Carotenoids
Echinacea purpurea (L.) is one of the most important medicinal plants in the world showing different biochemical reactions as affected by drought stress and nitrogen fertilizer. The purpose of this study was to determine the effect of nitrogen on soluble protein, enzyme activities, carotenoids metabolism, greenness and biological yield of the Echinacea purpurea under different levels of irrigation. The experiment was conducted in a research field in Iran during 2013-2015. Irrigation treatments included irrigation after 25, 50 and 75% soil water depletion, and nitrogen sources were no nitrogen (N), nitroxin, 40kgNha(-1), 40kgNha(-1)+nitroxin and 80kgNha(-1). Nitroxin is a biofertilizer including Azotobacter and Azospirillum. The activity of catalase (11.9-21.3mmolg(-1)fwmin(-1)), peroxidase (40.1-48.9 mu molg(-1)fwmin(-1)), polyphenoloxidase (0.79-3.63mmolg(-1)fwmin(-1)) increased in both years under drought stress conditions. The lowest greenness (50.1-45.9) was achieved from no-application of nitrogen in the irrigation treatment after 75% water depletion. The results demonstrated the beneficial effects of nitrogen sources on physiological reactions, especially peroxidase, polyphenol oxidase and carotenoids metabolism. It is concluded that irrigation of E. purpurea based on 50% water depletion and 80kg nitrogen as well as the combination of nitroxin and 40kg nitrogen treatments should be an appropriate choice for 2years.
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