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The University of Birjand (Persian: دانشگاه بیرجند‎) is the largest and oldest public university in the east of Iran. In 2018, the University was ranked 300-350 in Asia University Ranking and +1000 in World University Ranking by Times Higher Education. The University of Birjand also achieved a top rank in Times Higher Education Young University Rankings, 2019. It is also one of the 33 Iranian universities listed in the 2020 Times Higher Education World University Rankings for engineering and technology.[4] The university has a multilingual webs [...]

Journal Article

Journal article

Hydrotime model: Introduction and application of this model in seed researches  [2014]

Alimagham, S. Majid , Graduated M.Sc Student of Agroecology, Gorgan University of Agricultural Sciences and Natural Resources, Iran; Ghaderi-Far, Farshid , Associate Professor, Dept. Agronomy, Gorgan University of Agricultural Sciences and Natural Resources, Iran;

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Germination is the first and most important developmental stage of plants which is influenced by genetic and environmental factors. Hydrotime model describes the relationship between water potential (ψ) and seed germination rate and percentage. This model quantifies the rate of germination progression (θH), the stress tolerance of germination (ψb(50)) and the uniformity of germination (σψb). This indicators can be used to show seed lots or varieties vigor and evaluation of dormancy in seed and some treatments effects (e.g. priming, ABA or GA) on seeds vigor. Hydrotime model is not well known amongst Iranian researchers. This study aims at introducing the application of hydrotime model in germination data analysis. To achieve this, germination data of three plants (sweet clover: Melilotus officinalis, rye: Secale cereael and wheat: Triticum aestivum) in response to drought stress were used. The θH value quantifies the inherent rate of germination,which can vary among species and different physiological stages. The ψb(50) value is an indication of theaverage stress tolerance of the population. A population with a high ψb(50)value (less negative) will be inhibited germination at higher ψ (less stress) than will a population with a lower ψb(50) value. The value of ψb(50) for a seed population can be shifted to higher or lower values by the induction and release of dormancy.The σψb value is a quantitative estimate of the uniformity in germination in the populat
ion as greater σψb means a wider variation between the first and last seeds to germinate.


Environmental Stresses in Crop Sciences

ISSN : 2228-7604