Faezeh Zaefarian; Mohammad Mehdi Mirzaei; Shiva Taheri
Abstract
In order to investigate the effect of pretreatment of seeds with organic fertilizers on germination and seedling indices of three cultivar of black cumin seed, a factorial experiment was conducted in the form of a completely randomized block design in four replications in 2021. The treatments of this ...
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In order to investigate the effect of pretreatment of seeds with organic fertilizers on germination and seedling indices of three cultivar of black cumin seed, a factorial experiment was conducted in the form of a completely randomized block design in four replications in 2021. The treatments of this experiment were cultivar in three levels (Iranian, Indian and Syrian) and seed pretreatment in three levels of organic fertilizers: humic acid, biozinc and control (without pretreatment). Characteristics of germination percentage and rate, germination uniformity, root, shoot and seedling length, fresh and dry weight of root, shoot and seedling, seedling tissue water content, seedling length vigour index and allometric coefficient were measured. The results showed that the studied treatments and their interaction had a significant effect on most of the measured traits. The maximum and minimum germination percentages (93.67% and 83.33%, respectively) were allocated to Iranian and Indian cultivars; while the maximum germination uniformity (256.79 hours) was obtained in the Syrian cultivar pretreated with humic acid and the minimum germination uniformity (134.40 hours) was obtained in both Iranian cultivar without pretreatment and the Iranian cultivar pretreated with biozinc. Also, the highest seedling length and seedling length vigour index were recorded in Iranian cultivars pretreated with humic acid (4.20 cm and 400.21), respectively, and the lowest ones (1.42 cm and 113.01) in Syrian cultivar pretreated with biozinc. In general, in the present study, the effect of seed pretreatment using humic acid as organic fertilizer was positive in many germination indexes.
seyed abbas Mirjalili; elahe poorazizi
Abstract
Parsley, which today is classified as a vegetable, has many properties and is used in food and pharmaceutical industries. The seeds of the native populations of this plant do not have a good germination percentage and many efforts are being made to improve the growth and germination of the seeds. In ...
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Parsley, which today is classified as a vegetable, has many properties and is used in food and pharmaceutical industries. The seeds of the native populations of this plant do not have a good germination percentage and many efforts are being made to improve the growth and germination of the seeds. In order to investigate the seed germination rate of native stands and the effect of hydropriming treatment in increasing the germination power of the seeds of these stands, an experiment was conducted in the form of a completely randomized design at four time levels (12, 24, 48 and 72 hours) against the control and with four replications among 24 native stands collected from different parts of the country and two populations with foreign origin imported were carried out. The results showed that the average seed germination percentage of the stands before treatment was 56.7% (the lowest rate was 20% in curled leaf Parsley stand and the highest was 78% in Jiroft 1 stand). Also, the hydropriming treatment had a significant effect at the level of 1% on the emergence of parsley seeds, and its greatest effect was in 24 hours. Also, the highest effect of treatment on Arak, Garmsar and Pich of Tehran was 21.8, 20.9 and 20%, respectively. The least effect of hydropriming was on the population of curled leaf parsley (7.4%). Totally, it was concluded that hydropriming can increase the germination percentage and quality of parsley seeds.
Alireza Bagheri; Farzad Mondani; Azadeh Geravandi; Sahar Amiri
Abstract
Seed priming is one of the most effective methods for improving germination and seedling establishment. In order to study the effect of priming on germination of different shapes of Marigold compact petal variety (Calendula officinalis L.), a factorial experiment was conducted in a completely randomized ...
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Seed priming is one of the most effective methods for improving germination and seedling establishment. In order to study the effect of priming on germination of different shapes of Marigold compact petal variety (Calendula officinalis L.), a factorial experiment was conducted in a completely randomized design with three replications in 2014. The germination traits were calculated for different shapes of Marigold seedlings such as germination percentage, germination rate, seedling index, root length and shoot length. The results showed that crescent-shaped seeds exhibited the highest percentage, rate and germination index with 75.51%, 4.48 germination per day and 18.97%, respectively. In addition, the effect of osmo and hydro priming on seeds showed that the highest germination percentage (75.56%) was observed in zero bar of osmo priming and hydro priming of 8 hours. The highest germination rate in the hydro priming treatments was 8 and 16 hours, with values of 3.16 and 3.26 germination per day, respectively. The highest germination index of hydro priming treatments was recorded at 8 and 16 hours with values of 12.22 and 11.75, respectively. Priming action can be effective in reducing the negative effects of various factors during germination and afterwards. Overall, the results of this experiment showed that the use of osmo and hydro priming for the crescent-shaped seeds of Mrigold had the highest germination traits.
Ebrahim Sharifi Ashoorabadi; maryam Mackizadeh Tafti; Jamal Hasani; Mohammad Hossine Lebaschy
Abstract
To investigate of tolerance levels and screening of different thyme species to the temperature stresses, a factorial experiment was conducted in a completely randomized design with three replications in the vitro condition. The experiment was conducted using six Thymus species (Th. fallax, Th. fedtschenkoi, ...
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To investigate of tolerance levels and screening of different thyme species to the temperature stresses, a factorial experiment was conducted in a completely randomized design with three replications in the vitro condition. The experiment was conducted using six Thymus species (Th. fallax, Th. fedtschenkoi, Th. pubescens,Th. vulgaris, Th. daenensis and Th. kotschyanus), at two moisture levels (dry and wet) and at 15 temperature levels (from -8 ° C to 48 ° C with an increase of 4 ° C). Measured characteristics included germination percentage and mean germination time. According to the results, the highest germination percentage belonged to Th. pubescens (70.83%) and Th.daenensis (70.44%) and the lowest germination percentage belonged to Th. vulgaris (53.04%). The average percentage of germination of seeds in dry condition (74.66%) was significantly higher than wet condition (56.12%). The highest germination percentage was observed at -4 (79.44%), zero (78.33%) and 4 (79.72%) Celsius that had significant differences with others. Interactions of species with moisture conditions showed, the highest germination percentage related to Th. kotschyanus (79.40%), Th. pubescens (78.95%), Th. daenensis (78.08%) and Th. falax (77.53%) in dry conditions and the lowest germination percentage belonged to Th. vulgaris (45.46%) in wet conditions.Using the results, different species of Thymus can be screened for temperature tolerance in dry and humid conditions and recommended for cultivation in different regions. In this experiment, native species were more resistant to temperature stresses.
hadis hasanvand; ghasem parmoon; Seyed Amir Moosavi; seyed ata Siadat
Abstract
This experiment was conducted at seed technology laboratory of Agricultural Sciences and Natural Resources University of Khuzestan, in 2018 with the to evaluate the effects of seed priming on cardinal temperatures and thermal time requirements of borage seed germination. The factorial experiment was ...
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This experiment was conducted at seed technology laboratory of Agricultural Sciences and Natural Resources University of Khuzestan, in 2018 with the to evaluate the effects of seed priming on cardinal temperatures and thermal time requirements of borage seed germination. The factorial experiment was arranged based on the randomized complete block design with three replications. Treatments were gibberellic acid (0 (distilled water as control), 100, 200, 400 mg/L-1), priming durations (6 and 12 hour) and seven levels of germination temperatures (5, 10, 15, 20, 25, 30 and 35 oC). Beta model, beta modified, dent-like and segmented were used to determine cardinal temperatures. Results showed that seed germination significantly increased at both priming durations of 6 and 12 hours with increasing of temperature and gibberellic acid concentrations. The highest seed germination was observed at 200 mg/L-1gibberellic acid and 15 oC. Increase of gibberellic acid concentrations resulted higher thermal time requirements to complete 50% of germination in seed population. From the results, the beta model provided the best fit to evaluate cardinal temperatures of borage seeds. It is therefore, suggested that the base, optimum and celling temperatures of borage seeds are 0.51, 21.5 and 35.1 oC and influenced by application 200 mg/L-1GA to 0.33, 23.5 and 35.8 oC.
H.R. Eisvand; A. Sharafi
Volume 5, Issue 2 , January 2016, , Pages 23-35
Abstract
Various species of Satureja genus are growing in different regions of Iran. The drought stress is one of the most unfavorable factors for plant establishment and growth in main parts of the Iran. Germination and emergence of the most plants is affected by environmental stresses including drought and ...
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Various species of Satureja genus are growing in different regions of Iran. The drought stress is one of the most unfavorable factors for plant establishment and growth in main parts of the Iran. Germination and emergence of the most plants is affected by environmental stresses including drought and disturbed evnironments. One way to improve seeds and seedlings to cope with stress is seed priming. This research was conducted in order to study the effects of osmo and hydro priming at different temperatures on improving seed and seedling performance of Satureja khuzestanica Jamzad under drought stress conditions. A greenhouse research was carried out as a factorial experiment on the base of a randomized completely block design with three factors and four replications. The factors were including drought stress (50% and 25% of field capacity) with control (75% of FC), osmotic potential of priming (0, -4, -8 bar using PEG 6000) and priming temperatures (15 and 25 ºC). The percentage and rate of emergence, seedling fresh and dry weights, seedling height, vigor index, and leaf area decreased by increasing drought stress but the essential oil content and root length increased. The highest percentage of essential oil observed under 25% FC. Interaction of drought stress and osmotic potential of priming solution was significant on percentage and rate of emergence and vigor index. The interaction of priming temperatures and osmotic potential of priming was significant on the percentage and rate of emergence, vigor index, and shoot dry weight. Hydro-priming at 15 ºC had the most positive effect on the percentage and rate of emergence, fresh and dry weight of seedling, root length, plant height, leaf area, and vigor index. Overall, seed quality was better when priming temperature was lower (15 ºC).
