The Optimized Protocols for Production, Adaptation and Keeping of the Produced Artificial Seeds from Encapsulated Lateral Buds in Stevia rebaudiana (Bertoni)

Document Type : Original Article

Authors

Department of Agronomy and Plant, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

Abstract

Stevia, as an anti-diabetic medicinal plant, is estimated to be about 300 times sweeter than sugar cane. Low seed germination is a major problem in stevia propagation.  Artificial seeds (ASs) technology is a valuable method for it’s rapid and massive propagation. In this study, the effective factors on production, the produced plantlet adaptation and keeping of the ASs produced from encapsulated lateral buds were efficiently optimized for the first time. The results showed that 2.5% sodium alginate with 1% calcium chloride was the best composition for coating the ASs. The bigger lateral buds (2-3 mm) with MS medium resulted in the highest percent and rate of germination. Germination and growth of the ASs were increased using 1 mg l-1 BAP with 1.5 mg l-1 Kn in the pre-culture environment. The findings indicated that transmission of the ASs-plantlets to cocopeat   seedbed increased the growth characters. Keeping the produced ASs in the MS medium had a significant (p <0.05) and positive effect on germination characters. Among the treatments for keeping artificial seeds in 90 days, the treatment of liquid paraffin at 4oC showed the best response for regrowth. In this research, the possibility of routine and massive production of ASs by encapsulating the lateral buds has been reported in stevia. Therefore, using this new protocol, the rapid and fast micro-propagation of this plant could be achieved through lateral buds for inexpensive and commercial purposes in the future.

Graphical Abstract

The Optimized Protocols for Production, Adaptation and Keeping of the Produced Artificial Seeds from Encapsulated Lateral Buds in Stevia rebaudiana (Bertoni)

Highlights

  • The purpose of artificial seed production is to use meristematic parts that can be encapsulated in alginate hydrogel coating for germination and become a real seed with the aim of adapting the grown seedlings to laboratory or field conditions.
  • Determining the appropriate concentration of sodium alginate and calcium chloride is an important factor in increasing the germination rate of explants.
  • Using liquid paraffin for long-term storage of artificial seeds can be an effective way to maintain the germination ability of artificial seeds.

Keywords

Main Subjects


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