The Effects of Silicon Dioxide Priming on Some Germination and Vegetative Growth Parameters of Rocket Cultivars Under Salt Stress Conditions

Rocket (Eruca vesicaria), a plant from the cruciferous (Brassicaceae) family, whose leaves are eaten as a salad, is also considered a medicinal plant due to its different therapeutic properties. In this study, the effects of silicon dioxide priming (0.5, 1, 1.5 mM SiO2) on the germination and vegetative growth properties of two different rocket cultivars (Geniş Yaprak, Eda) were investigated under increased salt stress conditions (150, 200 mM NaCl). For this purpose, germination percentage (GP), germination index (GI), germination rate coefficient (CVG), mean germination time (MGT) germination rate index (GRI) were calculated as germination parameters. Shoot and root length (mm), leaf width and length (mm), plant fresh weight (g) were measured in seedlings developed from germinated seeds, and seedling vigour index (SVI) was calculated. The effects of SiO2 priming on germination and vegetative growth differed according to the cultivar. In Geniş Yaprak cv., 1 mM SiO2 application had a positive effect on germination parameters both in seeds not applied salt stress and under 150 mM salt stress, and increased the germination rate from 30%25 to 73%25, especially in salty conditions. Under 200 mM salt stress, 1.5 mM SiO2 had a positive effect on germination parameters in same cultivar. Although SiO2 applications in Eda cv. were not effective on germination parameters under stress-free conditions, they had a positive effect on vegetative parameters. Especially, 1.5 mM application dose increased SVI, root and shoot length and plant fresh weight. In both salt concentrations, 1 mM application dose made a slight improvement in germination parameters of Eda cv. The positive effects of SiO2 applications on vegetative growth parameters such as leaves, roots and shoots were determined at different doses for both salt concentrations

The Effects of Exogenous Glutamine Application on Some Germination Parameters of Different Carrot Cultivars Grown in Salinity Conditions

Carrot (Daucus carota), which can be orange, yellow, purple, white and red in color due to the difference in the pigments it contains, is a very rich food in terms of carotene and ascorbic acid. In this study, the effects of exogenous Glutamine (Gln) pre-treatments ( 1, 2, 3, 4 mM) on the some germination parameters of carrot seeds (orange, yellow, purple), which are known to be sensitive to salt stress according to the cultivar, were investigated under salt stress conditions (150 mM NaCl). For this purpose, germination percentage (GP), mean germination time (MGT), germination rate coefficient (CVG), germination rate index (GRI), germination index (GI), which are some of the important germination parameters, were determined. According to the results of analysis of variance, it was determined that there was an interaction between cultivars and applications and all germination parameters under salt stress conditions (***plt%253B0.001). The effect of Gln pre-treatments on germination under salt stress and unstressed conditions differed according to the application dose and cultivar. Glutamine application under salt stress had no effect on germination except for the orange carrot cv. In this cultivar, 1 mM pre-treatment had a positive effect on germination parameters under salt stress conditions. In unstressed conditions, although 3 mM Gln pretreatment in orange carrot cv. and 4 mM Gln in yellow carrot cv. had a positive effect on germination parameters compared to control, the highest germination in purple carrot cv. was obtained in control seeds

Evaluation of the Effectiveness of Silicon Dioxide on Some Germination and Vegetative Growth Parameters of Radish Cultivars in Saline Conditions

The salt tolerance level of the radish (Raphanus sativus L.), which has a rich nutritional content, varies depending on the cultivar (cv). In this study, which was carried out using two radish cv. (big red, little red), it was aimed to determine the effect of exogenous silicon dioxide (0.5, 1, 1.5, 2 mM SiO2) applications on germination and vegetative growth parameters under salt stress conditions (150 mM NaCl). After determining the germination percentage (GP), germination index (GI), germination rate coefficient (CVG), mean germination time (MGT) and germination rate index (GRI) for germinating seeds, shoot and root length (mm), leaf width and length (mm), root and shoot fresh weights (g) were measured and seedling vigour index (SVI) was calculated. SiO2 applications had a positive effects on germination parameters in both cultivars under both non-stress and salt stress conditions. While 1.5 mM SiO2 application caused an increase in germination rate in little red cultivar, it was determined that 1 mM application was more effective under salt stress conditions and increased the germination rate by 2 fold (from 24%25 to 48%25). In the big red cv., 2 mM SiO2 application had a positive effect on germination parameters both in salinty and unsalinity conditions. Exogenous SiO2 pre-treatment had also the positive effects on vegetative growth in both cultivars under stressed and unstressed conditions. According to the results of variance analysis, interaction was determined (***plt%253B0.001) between cultivars and applications and all other parameters except root fresh weight. 1.5 mM application dose significantly increased all vegetative growth parameters in little red cultivar under non-stress and salt stress conditions. In the big red cv., a similar effects were obtained as a result of 1 mM SiO2 application