Tuz Stresi Koşullarında Havuçta (Daucus carota L.) Eksojen Silikon Dioksit Uygulamaları

Abstract

In this study, the effects of exogenous silicon dioxide applications (0.5, 1, 1.5 mM SiO2) on the germination parameters of carrot seeds were investigated under salt stress conditions (150, 200 mM NaCl). For this purpose, germination percentage (GP), mean germination time (MGT), germination rate coefficient (CVG), germination rate index (GRI), germination index (GI), seedling viability index (SVI), leaf number, shoot and root lengths (mm) and plant fresh weight (g) were determined. Germination parameters of yellow carrot, sensitive to salt stress, were adversely affected by 150 mM NaCl application and shoot and root lengths were reduced by 80%. Especially SiO2 applications had a positive effect on germination parameters for the cultivar. In 150 mM NaCl application, the germination of the seeds treated with 0.5 mM SiO2 increased approximately two times (23%), and 15% germination was obtained in 200 mM NaCl, which did not germinate in the control. Although the black carrot cultivar tolerated salt stress, silicon dioxide treatments had a stimulating effect on germination and development. It was determined that especially 1.5 mM SiO2 application in black carrot seeds had a positive effect on germination parameters. Germination percentage increased to 93% in seeds treated with 1.5 mM SiO2 in 150 mM NaCl, and 86% at 200 mM NaCl concentration, reaching higher values compared to the control group. The results showed that pre-treatment with appropriate silicon concentrations significantly improved germination performance and promoted tolerance to the salt stress.

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

“…On the other hand, application of silicon dioxide to carrot seeds had a positive effect on germination parameters of yellow and black carrot cultivars under saline conditions. Especially in the yellow carrot cv., which did not germinate at a high salt concentration (200 mM), germination was obtained after silicon dioxide application (Nasırcılar et al 2021). There were no studies of exogenous glutamine pre-treatment in carrots so far, but glutamine application reduced the inhibitory effect of salt stress on germination in onions (Çavuşoğlu et al 2020).…”

“…In this way, more homogeneous germination and seedling emergence can be achieved (Eisvand et al 2011). Some applications to reduce the effects of salt stress in carrots are foliar application of jasmonic acid (Smoleń, et al 2020) and priming of seeds with silicon dioxide (Nasırcılar et al 2021).…”