Document Type : Research Paper

Authors

1 Department of Genetic and Plant Production, Research and Technology Institute of Plant Production, Faculty of Agriculture, Shahid Bahonar University of Kerman, Iran

2 MSc Student in Agronomy- Crop Ecology, Department of Genetic and Plant Production, Faculty of Agriculture, Shahid Bahonar University of Kerman, Iran.

3 Associate professor, Department of Genetic and Plant Production, Faculty of Agriculture, Shahid Bahonar University of Kerman, Iran.

Abstract

Natural habitats of licorice decreased dramatically while the demand for this plant increased. Licorice seeds exhibit a low germination rate due to secondary dormancy imposed by the hard seed coat. In this study, which was conducted in the spring of 2021 at Shahid Bahonar University of Kerman, Iran, the interaction effect of sulfuric acid (95-97 percent, 60 min) scarification with gibberellic acid (GA) concentrations (0, 100, 250, 500, and 1000 mg L-1) was studied in a factorial experiment based on a completely randomized design with four replications. The results showed that although there was no difference in germination between GA levels for scarified seeds, GA at 250 mg L-1 improved germination by 36 percent compared with control in non-chemically scarified ones. In contrast, increasing in GA concentrations increased seedling length, plant height, LN and CLN, LA, fresh and dry weight of shoot and root, while decreased chlorophyll index (SPAD). As a result, chemical scarification, application of GA at 1000 mg L-1, and germination at room temperature can effectively increase the germination rate and uniformity as well as early growth of licorice plant.

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