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Effects of nitric oxide on some morphophysiological and biochemical properties of basil (Ocimum basilicum L.) under drought stress conditions | ||
| تحقیقات گیاهان دارویی و معطر ایران | ||
| Article 7, Volume 35, Issue 4 - Serial Number 96, September and October 2019, Pages 601-616 PDF (598.11 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijmapr.2019.124983.2482 | ||
| Authors | ||
| B. Esmaielpour* 1; H. Fatemi2; M. Moradi3 | ||
| 1Department of Horticultural Sciences, Mohaghegh Ardabili University, Ardabil, Iran | ||
| 2Ph.D. student, Department of Horticultural Sciences, Mohaghegh Ardabili University, Ardabil, Iran | ||
| 3M.Sc. student, Department of Horticultural Sciences, Mohaghegh Ardabili University, Ardabil, Iran | ||
| Abstract | ||
| Drought stress, as one of the most important abiotic stresses, plays an important role in decreasing the yield of medicinal plants. In order to investigate the effect of nitric oxide on morphophysiological and biochemical characteristics of basil (Ocimum basilicum L.), the native population "Shahre-ray", a factorial experiment was conducted in a completely randomized design under drought stress conditions with three replications in the research greenhouse of Mohaghegh Ardabili University in 2017. Experimental factors included drought stress at three levels of complete irrigation (drip irrigation at three-day intervals throughout the growing season) and complete stop of irrigation at early flowering stage (60 days after planting at 10-12 leaf stage) and 50% flowering (75 days after planting at 14-15 leaf stage) and nitric oxide spray with sodium nitroprusside at four concentration levels of zero (leaf spray with distilled water), 0.5, 1, and 2 mM. The foliar application was carried out from the eight-leaf stage of the plant, with intervals of two weeks to four times. Results showed that stopping irrigation at both mentioned growth stages significantly reduced plant height, plant dry weight, chlorophylls a and b, total chlorophyll, carotenoid, and relative water content, and significantly increased electrolyte leakage rate, leaf proline content, and essential oil percentage. Foliar application of 2 mM nitric oxide significantly increased plant growth under irrigation interruption, especially at 50% flowering. Increasing the concentration of nitric oxide produced the highest essential oil percentage (1.4%) at the early flowering stage under irrigation interruption conditions and significantly increased the content of essential oil components including methyl chavicol, linalool, geranial, geraniol, α-pinene, β-pinene, and myrcene. In general, the results showed that foliar application of nitric oxide at 50% flowering stage under irrigation interruption improved the growth of basil and increased the percentage and components of essential oil via osmotic adjustment, preventing chlorophyll degradation and maintenance of leaf water content. | ||
| Keywords | ||
| Proline; chlorophyll; linalool; methyl-chavicol; electrolyte leakage | ||
| References | ||
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