Improvement and breeding
S.G. Sajjadi; A. Tavassoli; M. Dadmehr
Abstract
To investigate the effects of hydrogel on growth, yield, and some secondary metabolites of roselle (Hibiscus sabdariffa L.) under drought stress conditions, an experiment was conducted in a farm located in the south of Dalgan city, Sistan and Baluchestan province in the 2017-2018 crop year. This research ...
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To investigate the effects of hydrogel on growth, yield, and some secondary metabolites of roselle (Hibiscus sabdariffa L.) under drought stress conditions, an experiment was conducted in a farm located in the south of Dalgan city, Sistan and Baluchestan province in the 2017-2018 crop year. This research was carried out as a split plot experiment in a randomized complete block design with three replications. The experimental treatments included drought stress as main plot at four levels (irrigation at FC (field capacity), 85% of FC, 70% of FC, and 55% of FC), and hydrogel consumption as sub plot at three levels (A200 hydrogel consumption, silicate hydrogel consumption, and no hydrogel consumption). The quantitative traits including plant height, number of sub-branches per plant, number of flower per plant, plant fresh and dry weight, sepal fresh and dry yield, and harvest index and qualitative traits including content of anthocyanin and sepal phenolic compounds were measured. The results showed that the highest amount of quantitative traits was obtained from full irrigation treatment with the consumption of A200 hydrogel. But there was no significant difference between this treatment and the treatments of full irrigation with silicate hydrogel consumption and full irrigation without hydrogel. Also, no significant difference was observed between the above three treatments and the treatments of both types of hydrogels application in 85% and 70% of FC. The qualitative traits increased with increasing the stress intensity. The hydrogel consumption in comparison with not consuming it led to a decrease in the amount of anthocyanin and sepal phenolic compounds due to the modification of stress conditions by hydrogel.
F. Soleymani; A.R. Pirzad
Abstract
Some crops have the ability to withstand environmental stresses as they prevent further production of oxygen free radicals or cope with the produced free radicals. Accordingly, in order to investigate the effect of mycorrhizal fungi species on eco-physiological characteristics of Hyssopus officinalis ...
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Some crops have the ability to withstand environmental stresses as they prevent further production of oxygen free radicals or cope with the produced free radicals. Accordingly, in order to investigate the effect of mycorrhizal fungi species on eco-physiological characteristics of Hyssopus officinalis L., a factorial experiment based on randomized complete block design was conducted with three replications at the research farm of west Azarbaijan Agricultural and Natural Resources Research Center in 2012. Treatments were species of mycorrhizal fungi (Glomus mousseae, G. intraradicese, G. fasiculatum, G. claroideum, Acaulospora longula and control without mycorrhiza) and four levels of irrigation (irrigation at 80, 70, 60 and 50% field capacity). Results showed the significant effects of irrigation and mycorrhiza on the ascorbate peroxidase, and significant interaction between irrigation and fungi species on the percentage of mycorrhizal colonization, catalase activity and superoxide dismutase. The order of highest colonization of Hyssop root was G. mosseae, G. intraradices, G. fasiculatum, G. claroideum and A. longula compared to control treatment in all irrigation levels. The highest activity of superoxide dismutase and catalase in plants inoculated with G. mosseae, G. fasiculatum, G. fasiculatum and G. claroideum belonged to irrigation at 50, 60, 50 and 50% of field capacity, respectively. However, the highest ascorbate peroxidase belonged to irrigation at 50% field capacity. In conclusion, the results showed that mycorrhizal species affected the amendment of water deficit stress due to the increased antioxidant enzyme activity in order to neutralize the effects of free radicals and cell membrane stability.
M.R. Ardakani; B. Abbaszadeh; E. Sharifi Ashourabadi; M.H. Lebaschi; F. Packnejad
Volume 23, Issue 2 , August 2007, , Pages 251-261
Abstract
In order to study drought stress effect on quantitative and qualitative features of balm (Melissa officinalis L.) a research was conducted under field condition in Karaj, Iran in 2005. Experiment was conducted using Randomized Complete Block Design with 4 replications. Treatment included T1 (non stress), ...
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In order to study drought stress effect on quantitative and qualitative features of balm (Melissa officinalis L.) a research was conducted under field condition in Karaj, Iran in 2005. Experiment was conducted using Randomized Complete Block Design with 4 replications. Treatment included T1 (non stress), T2 (80%FC), T3 (60%FC), T4 (40%FC) and T5 (20%FC). Effect of drought stress on shoot yield, essential oil yield, percentage of essential oil, leaf and stem yield, height, tiller number, length and width of leaf, stem diameter and internodes was significant (α=0.001). Effect of drought stress on number of lateral stem was not significant. Comparison of treatment means showed that highest shoot yield was related to T1 (non Stress) (6469kg/ha), highest essential oil (12.970 kg/ha) and highest essential oil percentage (0.3012%) was related to T4 (40%FC) and T5 (20%FC), respectively. Highest height (65.32 cm), leaf length (6.27 cm) and width (4.58 cm) were related to T1 (non stress). Highest stem diameter was related to T5 (20%FC). It could be concluded that moderate drought stress is beneficial for balm essential oil.