Nasrin Teimoori; Mohsen Saeidi; Mahmood Khoramivafa; Shahab Khoshkhoi
Abstract
The utilization of nanoparticles for seed priming may enhance the germination and seedling growth compared to bulk forms. Therefore, this research aims to investigate the effect of seed priming (with bulk iron oxide, nanoparticles of 1-100 nm and 40-60 nm in concentrations of zero, 2, 4, and 8 g l-1, ...
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The utilization of nanoparticles for seed priming may enhance the germination and seedling growth compared to bulk forms. Therefore, this research aims to investigate the effect of seed priming (with bulk iron oxide, nanoparticles of 1-100 nm and 40-60 nm in concentrations of zero, 2, 4, and 8 g l-1, water, and no priming) at different levels of drought stress (including no stress, -2, -4 and -8 bar) using polyethylene glycol 6000 on the characteristics of germination and growth of Adel chickpea cultivar. This research was performed as a factorial experiment based on a completely randomized design in three replications at Razi University. The results showed that germination ceased completely under drought stress of -8 bar. Drought stress at -4 bar after -8 bar resulted in a significant decrease in the percentage, speed, and vigor of germination by 96, 93, and 40%, respectively, and 130% increase in root length/shoot length ratio compared to the non-drought stress treatment. Seed priming treatments had the most positive and significant effect on the speed and vigor of germination in non-drought stress treatment and on the germination percentage in drought stress treatment. The seed priming with iron 8 g l-1 and 40-60 nm produced the highest length and weight vigor of germination. It appears that the priming treatments have resulted in better vigor and rate of germination in non-drought stress condition while germination percentage in drought stress. The seed priming treatment using iron 40-60 nm is the most effective compared to other priming treatments.
Nasrin Teimoori; Mokhtar Ghobadi; Danial Kahrizi
Abstract
Drought is one of the most important stresses in reducing plant growth, especially in the seed germination stage. Oxidative stress is one of the consequences of drought in plants. To investigate the reduction of oxidative stress damage caused by drought stress by using silicon in the initial stages of ...
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Drought is one of the most important stresses in reducing plant growth, especially in the seed germination stage. Oxidative stress is one of the consequences of drought in plants. To investigate the reduction of oxidative stress damage caused by drought stress by using silicon in the initial stages of camellia seedling growth, a factorial experiment as completely randomized design was carried out in the seed laboratory of Razi University with three replications. The factors include two camelina genotypes, four levels of drought stress (0, -3, -6, -9 bar using PEG-6000) and five levels of silicon (0, 2, 4, 6 and 8 mM). According to the results, drought stress increased the activity of antioxidant enzymes including peroxidase, catalase and superoxide dismutase and the amount of malondialdehyde, but it decreased the growth characteristics of seedlings and the amount of soluble proteins. The consumption of silicon (especially by 6 and 8 mM concentrations) increased the activity of antioxidant enzymes and seedling growth characteristics. So, consumption of 8 mM silicon increased peroxidase activity by 23.2%, catalase activity by 13.4%, superoxide dismutase activity by 41%, malondialdehyde by 19.1% and protein content. Soluble was 10.8%. Therefore, the consumption of silicon 8mM by activating the antioxidant system moderated the effects of oxidative stress caused by drought stress and increased the growth characteristics of camellia seedlings.
Nasrin Teimoori; Mokhtar Ghobadi; Danial Kahrizi
Abstract
Camelina oilseed has a lot of ability to be placed in the cultivation pattern of Iran's drylands. The seed germination and seedling establishment in dryland agriculture are usually exposed to drought stress. The aim of this study is to investigate the application effect of silicon concentrations in improving ...
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Camelina oilseed has a lot of ability to be placed in the cultivation pattern of Iran's drylands. The seed germination and seedling establishment in dryland agriculture are usually exposed to drought stress. The aim of this study is to investigate the application effect of silicon concentrations in improving the seed germination characteristics and seedling growth of camelina under drought-stress conditions. The experiment was conducted as a factorial based on CRD with three replications at the seed laboratory of Razi University. The factors include camelina genotypes (Sohail and Line-84), drought stress (0, -3, -6, -9 bar using PEG-6000) and silicon (0, 2, 4, 6 and 8 mM using sodium silicate). According to the results, increasing the drought stress decreased the seed germination characteristics and the seedling growth. However, germination percentage, germination rate, seedling length, seedling dry weight, seedling vigor indices and allometric coefficient of plumule to radicle weight were increased by silicon. To increase the measured traits, silicon 6 and 8 mM were better than other concentrations. In general, silicon was effective in mitigating the effects of drought stress on the seedling growth of camelina by improving the seed germination characteristics and seedling growth. Therefore, it seems that the silicon is an effective factor in such studies and its usability in camelina seed technology and seed coating for dryland areas.
