Browsing by Author "Ghiyasi, Mahdi"

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The Determination of Gibberellic Acid Effects on Seed Germination of Echinacea Purpurea (L.) Moench Under Salt Stress
(2019) Tunçtürk, Rüveyde; Tunçtürk, Murat; Ghiyasi, Mahdi; Kipcak, Serhat
The research was conducted to determne the effect of gbberellc acd pre-treatments on germnaton of Echnaceapurpurea seeds under salt stress. In the study, three different gibberellic acid concentrations (0, 100, 200 and 300 ppm)were pre-treated. Seeds planted in petri dishes were left to germinate after salt applications at 0, 50 and 100 mM (NaCl)concentrations. Responses of echinacea to priming and salt stress treatments were observed on the bases of some growthand viability (radicle and hypocotyl length, radicle fresh and dry weight, hypocotyl fresh and dry weight, germinationpower, germination speed, mean germination time, germination and sensitivity index) parameters.According to the result of the research; when the salt concentrations increase, the germination and growth parameters ofechinacea seeds were inhibited. It was conducted determined that increasing doses of gibberellic acid pre-treatments hadsignificant and positive effects on the germination and growth parameters of echinacea seeds under salt stress conditions.In physiological enhancement of echinacea seeds, the best results were obtained from the 300 ppm GA +0 mM (control) 3salt combination.
Foliar Applications of Zno and Its Nanoparticles Increase Safflower (Carthamus Tinctorius L.) Growth and Yield Under Water Stress
(Mdpi, 2023) Ghiyasi, Mahdi; Danesh, Younes Rezaee; Amirnia, Reza; Najafi, Solmaz; Mulet, Jose M.; Porcel, Rosa
Foliar application or minerals is a methodology to promote growth and/or yield and to protect plants against different kinds of stresses. Currently there is a great interest in evaluating the effect of nanoparticles for enhancing the effect of these treatments. This study was performed to evaluate and compare the effect of foliar application of zinc oxide (ZnO) and zinc oxide nanoparticles (ZnO-NPs) on the growth and yield of safflower under different irrigation regimes. Foliar applications of ZnO in all concentrations (4, 6, 8, 10, 12, and 14 g L-1) led to an increase in biomass yield, number of capitula per plant, number of seeds per capitulum, and grain yield of plants compared with control plants. The maximum increase in the studied traits was obtained with a ZnO concentration of 6, 8, and 10 g L-1. In a second round of experiments, we observed the effect of nanoparticles and found that spraying with ZnO and ZnO-NPs at a concentration of 10 g L-1 may ameliorate the deleterious effects of water deficit. The results of the present study support the idea that foliar application of ZnO improves safflower yield, especially under drought stress, and showed that using of nanoparticles increases the efficiency of the application.
Machine Learning Insights Into Ascorbic Acid-Enhanced Germination of Black Cumin (Nigella Sativa L.) Under Cadmium Stress
(Springer, 2024) Ghiyasi, Mahdi; Danesh, Younes Rezaee; Amirnia, Reza; Sharifi, Leila; Najafi, Solmaz; Mulet, Jose M.; Porcel, Rosa
The objective of the present work is to study the impact of seed priming with varying concentrations of ascorbic acid (vitamin C) on the germination process of black cumin (Nigella sativa) under cadmium (Cd) stress. As expected, Cd had a great effect on germination rates and seedling growth. However, the application of ascorbic acid during seed priming effectively alleviated Cd stress and significantly increased seed vigor. Primed seeds exhibited markedly elevated final germination percentage, germination index, mean germination time, seedling length, seedling vigor index, and reduced abnormal seedling percentage. Additionally, vitamin priming reduced membrane lipid peroxidation, in treated seeds. Moreover, seed priming elicited a considerable increase in peroxidase and catalase activity, thus mitigating stress effects and augmenting seed vitality. Our experimental data allowed us to establish 100-150 mg/L as the optimal concentration range for ascorbic acid in seed priming of black cumin. These insights were further corroborated through modeling techniques based on supervised machine learning. Notably, XGBoost emerged as a proficient tool for predicting final germination percentage, mean germination time, seedling vigor index, abnormal seedling percentage, and peroxidase activity, while SVR demonstrated aptitude in forecasting catalase activity and germination index. The Gaussian method exhibited superior performance in predicting malondialdehyde content. These comprehensive findings substantiate the premise that vitamin priming with ascorbic acid serves as a promising strategy to ameliorate germination outcomes under Cd-induced stress conditions.