Determination of the Effects of Gibberellic Acid (GA₃) Doses on Germination Parameters in Some Soybean Varieties

Abstract

This study investigated the effects of different gibberellic acid (GA₃) doses (0, 25, 50, 100, and 200 mg L-1) applied to different soybean (Glycine max L.) varieties (Adel, Ataem-7, Cinsoy, Lider, and Umut 2002) on germination percentage, germination index, average germination time, seedling length, plumule length, radicle length, and seed vigor index. variety, dose, and variety × dose interaction were found to be statistically significant (P<0.01) for all parameters. Among the varieties, Cinsoy and Ataem-7 stood out in terms of seed vigor index and seedling development. The Lider variety had the lowest mean values. When GA₃ dose applications were examined, it was determined that the 50 and 100 mg L-1 doses had a positive effect on germination and seedling development. The 200 mg L-1 dose was found to negatively affect germination percentage and seed vigor index. Correlation analysis revealed strong positive correlations (r>0.80; P<0.01) between seedling length, plumule length, and seed vigor index. Principal component analysis (PCA) explained 70.6% of the total variance with two components. Seedling development parameters were prominent on the PC1 axis, while germination time was prominent on the PC2 axis. Biplot analysis showed that Adel, Ataem-7, and Cinsoy varieties were positively correlated with high seedling viability parameters, while the Lider variety was significantly different in these parameters.

Keywords

• Soybean
• Germination
• Gibberellic acid
• Variety

Ethical Statement

Ethics committee approval was not required for this study because of there was no study on animals or humans.

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