Improvement and breeding
H. Asgarian; V. Abdossi; E. Danaee; A. Ladan Moghadam
Abstract
Salinity stress is one of the most important factors in reducing the crop yield in the world. The application of humic acid along with selenium can improve the plant yield under salinity stress conditions by increasing the antioxidant capacity. To evaluate the effects of humic acid and selenium application ...
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Salinity stress is one of the most important factors in reducing the crop yield in the world. The application of humic acid along with selenium can improve the plant yield under salinity stress conditions by increasing the antioxidant capacity. To evaluate the effects of humic acid and selenium application under salinity stress conditions in Calendula officinalis L., a factorial greenhouse experiment was conducted in a completely randomized design with three replications in Islamshahr city in 2018. The experimental treatments included sodium chloride (0, 50, and 100 mg l-1), humic acid (0, 100, and 200 mg l-1), and selenium (0, 5, and 10 mg l-1) and their combined effects. The results showed that increasing the salinity significantly reduced the fresh and dry weight of shoots and roots and number of flowers per plant. The foliar application of 200 mg l-1 humic acid and 10 mg l-1 selenium improved carotenoids content of the petals and total chlorophyll of the leaves at all salinity levels. Also, with increasing the sodium chloride level up to 100 mg l-1, the amount of proline increased significantly. Meanwhile, the interaction treatments of humic acid and selenium had significant effects (P≤0.0.1) on improving the activity of superoxide dismutase and peroxidase enzymes at different salinity levels. The highest amount of essential oil (1.37%) was obtained in the interaction treatment of 200 mg l-1 humic acid and 10 mg l-1 selenium under salinity stress of 50 mg l-1 sodium chloride. In general, the results of this study showed that the foliar application of 200 mg l-1 humic acid and 10 mg l-1 selenium could be effective in reducing the negative effects of salinity stress on C. officinalis.
Improvement and breeding
E. Danaee; V. Abdossi
Abstract
Salinity is one of the most important abiotic environmental stresses which restricts the growth and production of plants. On the other hand, silicon (Si) is the second most abundant element in the soil and alleviates the biotic and abiotic stresses in the plants. For this purpose, a greenhouse experiment ...
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Salinity is one of the most important abiotic environmental stresses which restricts the growth and production of plants. On the other hand, silicon (Si) is the second most abundant element in the soil and alleviates the biotic and abiotic stresses in the plants. For this purpose, a greenhouse experiment was conducted as a factorial in a completely randomized statistical design with three replications to investigate the effects of silicon and nano-silicon (50 and 100 mg l-1) on some morphophysiological and phytochemical properties of peppermint (Mentha piperita L.) under salinity stress at the different levels of sodium chloride (0, 50, and 100 mg l-1) in 2019. The results showed that the salinity stress significantly reduced the fresh and dry weight of aerial parts and root, and chlorophyll, total phenol, and protein contents. The activity of superoxide dismutase and peroxidase enzymes and essential oil percentage differed at the different salinity levels. The amount of proline also increased significantly due to the sodium chloride treatment of 100 mg l-1. The plants treatment with the different levels of silicon and nano-silicon reduced the negative effects of salinity stress on the evaluated indices. The nano-silicon treatment of 100 mg l-1 showed the highest inhibition of salinity stress effects on the growth indices, antioxidant enzymes activity, and essential oil percentage. Therefore, according to the results of this research, the foliar application of silicon and nano-silicon could be recommended to reduce the negative effects of salinity stress on peppermint.