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Silicon alleviates salt stress in pistachio plants | ||
| Progress in Biological Sciences | ||
| مقاله 5، دوره 4، شماره 2، اسفند 2014، صفحه 189-202 اصل مقاله (402.87 K) | ||
| نوع مقاله: Original Research Papers | ||
| شناسه دیجیتال (DOI): 10.22059/pbs.2014.52299 | ||
| نویسندگان | ||
| Ghader Habibi* 1؛ Fahimeh Norouzi2؛ Roghieh Hajiboland2 | ||
| 1Department of Biology, Payame Noor University, I. R. of Iran | ||
| 2Department of Plant Science, University of Tabriz, 51666-14779 Tabriz, Iran | ||
| چکیده | ||
| In this work, the effects of silicon (Si) supplementation were studied in pistachio (Pistacia vera L. cv Ahmadaghaii) plants exposed to high salinity stress. Plants were grown in pots under control and salt (EC=15 dS m-1) conditions without or with Si treatment (0.35 g Na2SiO3 Kg-1 soil) under field conditions. Salt stress reduced the plants’ growth significantly in both –Si and +Si plants; however, Si-supplied plants had a higher root and shoot dry weight as compared to those without Si supply under salinity conditions. Salt stress caused a significant reduction of leaf photochemical activities; however, Si application ameliorated these effects. The reduction of the net CO2 assimilation rate under salinity stress was alleviated by Si application, accompanied by an increase in water-use-efficiency. The concentration of Na in the leaves and roots was significantly reduced by Si, while root K and leaf Ca concentrations were higher in Si-treated plants under salt stress compared with –Si ones. The activity of antioxidative enzymes increased under salt stress and Si application caused a further increase, being significant for superoxide dismutase (SOD). Salt stress induced membrane damage, as was indicated by a higher malondialdehyde (MDA) concentration. In Si-supplemented plants, however, the MDA amount did not increase under salt stress. The results indicated that the Simediated alleviation of salt stress in pistachio plants is related to higher photosynthesis and water-use efficiency, a reduction of Na uptake and transport, and the stimulation of the plant’s antioxidative defence capacity. | ||
| کلیدواژه‌ها | ||
| antioxidant defence system؛ net CO2 assimilation rate؛ Pistacia vera؛ salinity؛ sodium silicate | ||
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