Volume 18, Issue 44 (No.3&4-مقالات ریاضی از صفحه 213 تا 240 و یک مقاله زمین از صفحه 241 تا 248 و چکیده از 249 تا 255 2009)
2009, 18(44): 963-972 |
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The Effect of Different Concentrations of Nitrate and Ammonium on Growth, Nitrate Reductase Activity and Alkaloid Content of Hyoscyamus PusillusL.. Journal title 2009; 18 (44) :963-972
URL: http://jsci.khu.ac.ir/article-1-1214-en.html
URL: http://jsci.khu.ac.ir/article-1-1214-en.html
Abstract: (5050 Views)
Hyoscyamus is one of the medicinal plants, rich in tropane alkaloids. In this research the effects of nitrate and ammonium on production of secondry metabolites and other physiological parameters, were investigated. The results indicated that when nitrate and ammonium were both present in nutrient solution and ammonium concentration was lower than nitrate, dry and fresh weight of root and shoot increased. However, by increasing ammonium concentration, plant growth decreased. With increased concentra-tions of ammonium, root/shoot ratios were decreased. Nitrate reductase activity increased in both nitrate and ammonium fed plants. However, the higher ratio of ammonium to nitrate led to a decreased NRA. Alkaloid content (sum of hyoscyamine and scopolamine) increased in both nitrate and ammonium fed plants. However, the higher the ratio of ammonium to nitrate, the lower the alkaloid content.
Published: 2009/10/15
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