hossein rafiei; abbas dehshiri; Reza Tavakkol afshari; F. Hasani
Abstract
AbstractObjective of this research was identification and determination of the most suitable treatments to improve seed germination characteristics of Thyme medicinal plant. In order to evaluate different priming treatments on seed germination characteristics of Thyme, an experiment was conducted in ...
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AbstractObjective of this research was identification and determination of the most suitable treatments to improve seed germination characteristics of Thyme medicinal plant. In order to evaluate different priming treatments on seed germination characteristics of Thyme, an experiment was conducted in a completely randomized design with four replications which treatments were: without priming (control), Gibberellic acid (100, 200 and 300 ppm), Cytokinin (200 and 400 ppm), thiourea (1000, 2000 and 3000 ppm), potassium nitrate (10, 20, 100, 200, 300 and 400 ppm), phosphorus (10, 20, 30 ppm), manganese sulfate (2, 4 and 6 ppm). Germination characteristics such as shoot and radicle length, germination percentage, seed vigor, mean germination time and germination rate were evaluated. The results showed significant effects of seed priming treatments on shoot and radicle length, germination percentage, seed vigor and mean germination time at 1% probability level and germination rate at 5% probability level. Among the treatments, gibberellic acid treatments (100 ppm) and potassium nitrate (200 ppm), thiourea (2000 ppm) and manganese sulfate (4 ppm) presented high positive impacts on germination. Cytokinin treatments also significantly decreased many germination characteristics. It seems that potassium nitrate and gibberellic acid treatments compared with other treatments are more effective to improve all thyme germination characteristics. Keywords: Germination, Growth Stimulator, Seed Priming, Thymus.
A. Dehshiri
Abstract
Coriander seed (Coriandrum sativum L.) has essential oil, lipid and protein, and the lack attention to seed storage condition causes physical and physiological damage and ultimately decreasesits quality and deterioration so a factorial experiment in a completely randomized design was carried out and ...
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Coriander seed (Coriandrum sativum L.) has essential oil, lipid and protein, and the lack attention to seed storage condition causes physical and physiological damage and ultimately decreasesits quality and deterioration so a factorial experiment in a completely randomized design was carried out and six levels of time storage (30, 60, 90,120,150 and 180 days), five level of seed moisture (5, 7, 9, 11 and 13 %) and four level of temperature (10,15,20 and 25 oc ) were studied. The results showed that the moisture content of 13% had severe harmful effects on seed germination at different temperatures compared to other humidity. In 5% moisture, an increase in temperature from 10 to 25 oc had no significant effect on germination indices especially seed germination percent and it was above 90 in all temperatures. The results of different seed packaging material showed that between aluminum, fabric, paper and cellophane, aluminum has less impact on the germination indices. The conclustion that can storage coriander seeds in the moisture content of 5% and aluminum packaging at temperature bellow 25 for long-term without a significant reduction in its maintenance.
saeed amini; Mohammad Hassan assarah; Abbas Dehshiri; Shahla Hashemi Fesharaki
Abstract
The main goal of seed storage is to maintain its quality from harvesting to sowing time. Among all factors, storage temperature and seed moisture content are the most important factors affecting seed longevity. This experiment was conducted at University of Tehran, Department of Agronomy and Plant Breeding ...
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The main goal of seed storage is to maintain its quality from harvesting to sowing time. Among all factors, storage temperature and seed moisture content are the most important factors affecting seed longevity. This experiment was conducted at University of Tehran, Department of Agronomy and Plant Breeding during 1394 to determine the Ellis and Roberts deterioration model of Satureja hortensis seeds and introduce constants of viability equation. Seed viability and initial moisture content was measured and after that seeds were adjusted to 5, 7, 9, 11 and 13% moisture content and sealed hermetically in Nano packets. Storage temperatures were 10, 15, 20 and 25˚C. The interval of sampling depended on the storage conditions. Seed viability constants were estimated to predict seed longevity in this species and relationship between sigma and moisture content and temperatures was determined. After probit analysis, survival curves were depicted in each condition. Results showed that seeds with 5% moisture content stored at 10°C had the highest germination percentage, but seeds which were stored at 13% moisture content and 20 and 25°C had the highest deterioration rate. Estimates of KE, CW, CH and CQ were 4.31, 1.83, 0.031 and 0.0004, respectively. Also, the results showed that seed longevity decrease with increased seed moisture and temperature.
