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Evaluation of Nonlinear Regression Models to Describe Seed Germination Response of Mountain Rye (Secale mountanum) to Temperature
Omid Ansari, Farshid Ghaderifar, Farzad Sharif Zadeh, Ali Moradi,
Volume 3, Issue 2 ((Autumn & Winter) 2017)
Abstract

The present study sought to evaluate the effect of different temperatures on germination and to determine cardinal temperatures (i.e., base, optimum and maximum) of Secale mountanum at temperatures of 3, 5, 10, 15, 20, 25, 30 and 35oC. Three nonlinear regression models (i.e., segmented, dent-like and beta) were used for quantifying the response of germination rate to temperature. The results showed that in addition to germination percentage, the temperature has a significant impact on germination rate. Given the root mean square of errors (RMSE) of germination time, the coefficient of determination (R2), the simple linear regression coefficients a and b, and the relationship between the observed and the predicted germination rates, the best models for determination of cardinal temperatures of Secale mountanum were dent-like and beta models. Base, optimum and maximum temperatures were estimated to be about 2.70 to 3.17, 21.27 to 30.00 and 35.00 to 35.05°C, respectively for the dent-like model. However, given the high value of SE for temperature base and a negative estimate of the base temperature of the beta model, one can report the dent-like model as the right model. Therefore, by using the dent-like model and the estimated parameters, it is possible to use this model for predicting germination.
 


Effect of Accelerated Ageing and Natural Storage on Germination, Seedling Growth and Reserves Depletion of Chickpea (Cicer arietinum) Seeds
Mehdi Shaban, Farshid Ghaderifar, Hamidreza Sadeghipour, Ahad Yamchi,
Volume 3, Issue 2 ((Autumn & Winter) 2017)
Abstract

This study was conducted to evaluate the effects of accelerated aging and natural storage on seed germination and seedling heterotrophic growth of chickpea in Gorgan University of Agricultural Sciences and Natural Resources in 2014. The experiment was carried out, adopting a completely randomized design with four replications. Treatments were 8 aging levels (i.e., 2 years, and 4 years natural storage; 1, 2, 3, 4, 5 days of accelerated aging and a control). The results showed that the effect of aging treatment on all the traits was significant. Reduction of germination percentage, germination rate, root and shoot length seed vigor index and seedling dry weight of 4 and 5 accelerated aging days was higher than 2 and 4 natural storage years. The electrical conductivity of seed lots increased by an increase in accelerated aging to 4 and 5 days, which was higher than 2 and 4 natural storage years. This is due to incapability of a membrane to keep its permeability, which is the result of the higher sensitivity of seeds to accelerated aging. Reduction of the rate and efficiency of reserves used and also dynamic reserves in natural storage was lower than 4 and 5 accelerated aging days. However, maximum rate and efficiency of reserves used and also dynamic reserves were obtained at 2 accelerated aging days. This could be due to increase in repair reaction rates under these conditions and activation of hydrolytic enzymes in seeds. Finally, the results of the present study revealed that damages to chickpea seed at 4 and 5 accelerated aging days are more than 2 and 4 natural storage years, which leads to the reduction of germination percentage and rate.
 


Impacts of priming on germination and vigor of safflower (Carthamus tinctorius) seeds during artificial deterioration
Abdolhosein Rezaei, Farshid Ghaderifar, Hamidreza Sadeghipour,
Volume 10, Issue 2 ((Autumn & Winter) 2023)
Abstract
Extended Abstract
Introduction: Safflower seeds are rich in unsaturated fatty acids with a high capacity for peroxidation, which have a high potential to reduce germination and seed vigor during the storage period. Therefore, Introducing appropriate methods to preserve or improve their germplasm during storage would be advantageous.
Materials and Methods: In order to investigate the effects of seed priming on the germination and vigor of safflower seeds (Sofeh and Sina cultivars), a three-factor experiment was conducted in a completely randomized design with three replications before and after artificial deterioration. The experimental factors include controlled deterioration of seeds at 45°C in six levels (no deterioration, 1, 2, 3, 4, and 6 days) and priming in four levels (no prime, hydropriming, salicylic acid 50 mg/l and sodium chloride 5 percent).
Results: Artificial aging strongly and linearly reduced the germination ability of safflower seeds, and in a time interval which lasts between 2.5 to 4.5 days (depending on the treatment and the investigated trait), resulted in germinability and seed vigor reaches zero. The use of priming prior to artificial aging was more advantageous than priming after artificial aging. In addition, the priming method with salicylic acid was more useful compared to other priming treatments.
Conclusion: Priming of safflower seeds before storage would result in the extended shelf of the stored seeds while also preserving the seed germination potential. 
 
Highlights:
  1. The effect of priming on the germination and vigor of safflower seeds before and after artificial deterioration was compared and investigated.
  2. The effect of priming before and after artificial deterioration on the improvement of safflower seed quality varied in different cultivars.

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