Radman Karimi; Farshid Ghaderi-Far; A. Hamidi; Mohsen Malek; Hamid Reza Sadeghipour; Asieh Siahmarguee
Abstract
This research was conducted to investigate the effects of coating wheat cv. dryland Qaboos seeds by the liquid superabsorbent polymer AB200-c under water stress conditions. The factors of the experiments included different water potentials of 0, -0.3, -0.6,, -0.9 and -1.2 MPa and seed coating by superabsorbent ...
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This research was conducted to investigate the effects of coating wheat cv. dryland Qaboos seeds by the liquid superabsorbent polymer AB200-c under water stress conditions. The factors of the experiments included different water potentials of 0, -0.3, -0.6,, -0.9 and -1.2 MPa and seed coating by superabsorbent polymer at 0, 0.2, 0.5, 0.7 and 2 ml of super absorbent polymer per 100 grams seeds. The Hydrotime model based on binomial distribution was used to investigate the reaction of seed germination to different coating treatments and water stress. Seed coating by the superabsorbent polymer increased germination percentage compared to control seeds at water potentials of -0.9 and -1.2 MPa. Also, these treatments increased the growth rate of seedlings compared to control. Based on the analysis of the coefficients in the Hydrotime model, seeds coated by the superabsorbent polymer made more negative base water potential or greater tolerance to water stress; the value of this coefficient was -1.54 MPa in the control seeds but -1.83 MPa in the coated seeds. Accordingly, polymer coating increased the threshold of tolerance to water stress in wheat seeds. Also, differential coating of seeds with the superabsorbent polymer had significant effects on germination and seedling growth criteria, which point to the importance of using an appropriate amount of superabsorbent polymer in wheat seed coating treatment. Based on this research, seed coating with the superabsorbent polymer can be considered as an efficient technique for reducing the negative effects of water stress on wheat seed germination and seedling growth.
Mohsen Malek; Farshid Hassani; Enayat Rezvani; Vahidreza Mahmoodi; Masoud Khosravi
Abstract
Ferula assa-foetida is one of the important medicinal plants of Apiaceae that has been exposed to extinction with repeated withdrawals from its natural habitat. Study of seed germination behavior of this species can lead to the development of cultivation and protection of its natural habitat. In order ...
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Ferula assa-foetida is one of the important medicinal plants of Apiaceae that has been exposed to extinction with repeated withdrawals from its natural habitat. Study of seed germination behavior of this species can lead to the development of cultivation and protection of its natural habitat. In order to optimal conditions determine for the standard germination test of Ferula assa-foetida seeds (which belongs to the heights of Yasuj city located in Kohgiluyeh and boyer-ahmad provinces), this experiment was designed as factorial in a completely randomized design in six treatments with different levels, with control treatment and in three replications. The experiment was carried out in 2021-2022 in the seed quality analysis laboratory of the Seed and Plant Registration and Certification Research Institute of Karaj, this factorial experiment was conducted based on a completely randomized design. For this purpose, Ferula assa-foetida seeds were evaluated under different temperature regimes (including 10, 15, and 20 °C) and different germination substrates (top of the paper (TP), between paper (BP), and sand (S)). Various pretreatments in the standard germination test process include stratification (for 14 and 35 days at 7 °C) and treatment with different substances (including gibberellic acid, kinetin, and potassium nitrate) as well as the seeds leaching for 24 hours. According to the results, kinetin pre-treatment (250 ppm) and TP seed germination substrate at 10 °C; optimal germination conditions of Ferula assa-foetida seeds were proposed for evaluation of different seed samples.
