TY - JOUR T1 - Improving the growth of tobacco (Nicotiana tabacum L.) seedling by methyl jasmonate under drought stres TT - بهبود رشد گیاهچۀ توتون (.Nicotiana tabacum L) در شرایط تنش خشکی تحت تیمار متیل جاسمونات JF - nbr JO - nbr VL - 3 IS - 4 UR - http://nbr.khu.ac.ir/article-1-2792-en.html Y1 - 2017 SP - 308 EP - 318 KW - non-enzymatic antioxidants KW - plant hormone KW - photosynthetic pigments KW - tobacco KW - water stress N2 - Application of some chemical components including plant hormones such as methyl jasmonate causes resi-stance to increase in environmental stresses. In this study, the effect of metyl jasmonate in different concentrations (10, 20 and 30 uM) on the elevation of the plant resistance was investigated in drouht stress. Tobacco seedlings were studied under drought stress caused by polyethylene glycol (20%) during periods of 3, 6 and 9 days. The results revealed that the imposed stress significantly increased soluble sugar content, MDA and non-enzymatic defense factors such as ant-hocyanin and proline. In contrast, it is reduced the amount of photosynthetic pigments, carotenoids and flavonoids. On the other hand, the use of methyl jasmonate decreased malondialdehyde as a marker of lipid peroxidation and values of some detent factors such as proline, beta-carotene and MDA. Meanwhile, it increased the amount of soluble sugars and photosynthetic pigments, anthocyanins, flavonoids and flavonols. As a result of the simultaneous reduction of lipid pe-roxidation and some antioxidants, it seems that using exogenous methyl jasmonate can help the plant withstand against drought stress conditions. M3 10.21859/acadpub.nbr.3.4.308 ER -