Latifeh Pourakbar, Mehdi Abedzadeh,
Volume 1, Issue 2 (12-2014)
Abstract
Effects of ozone depletion and increase of UV radiation have been studied by many researchers. The aim of this study was to investigate the effects of UV-B radiation on Melissa officinalis L. as well as the impact of salicylic acid and magnetic fields in the reduction of harmful effects of radiation on plants. The Melissa officinalis L. plants were treated with 28 ± 2 Cº for approximately 60 days. The light intensity was 150 µ E mˉ² Sˉ¹ and the light/dark regime was 16/8 h. UV-B treatment was applied after the six-leaf stage for a period of 15 days and 20 min every day. Salicylic acid (1mM) was daily sprayed on the plants after the six-leaf stage for one week. Magnetic field treatment was applied for an hour with intensities of 0, 40 and 85 mT. The results indicated that the UV-B radiation led to reduction of root and shoot dry and fresh weights, and root and shoot elongation. The radiations also reduced the content of photosynthetic pigments (chlorophyll a, chlorophyll b and carotenoid), sugar and soluble proteins. The phenylalanine ammonia-lyase activity and UV-absorbing content compounds increased under the effect of UV-B radiation. The results showed that treatment with salicylic acid and magnetic fields reduced damages to the plant due to UV-B radiation.
Mrs Seyedeh Maryam Mousavian Kalat, Mrs Latifeh Pourakbar, Mr Majid Azizi,
Volume 12, Issue 3 (9-2025)
Abstract
Iranian black zira is an aromatic and medicinal plant from Apeaceae family. In order to investigate the effect of fertilization and tuber age on plant height, greening percentage, flowering percentage, and yield components, an experiment was conducted in field conditions in the form of 9 main plots including NPK fertilizer at three levels (control ), fertilizer 1(2.5 grams per liter), fertilizer 2 (with a concentration of 2 times and 5 grams per liter) and tuber age at two levels of three and four years (medium and three-year-old tubers ) was carried out in, fertilizer with 2 times concentration) and tuber age at two levels (three and four years old) was carried out in 1402-1403 in Kalat region of Khorasan Razavi.The results showed that tuber weight has a direct and positive effect on the percentage of germination, flowering, plant growth and yield. The highest percentage of greening (100%) and flowering (100%) was observed in large tubers and the lowest percentage of greening (51%) and flowering (16.93) was observed in medium tubers and 0 fertilizer (no fertilization).application of 20-20-20 fertilizer (NPK) and use of tubers with more age (weight) improved the growth and yield of Iranian black zira.
