A protocol for repetitive somatic embryogenesis from mature peanut epicotyls

Area of Science:

• Plant Biotechnology
• Agricultural Science
• Somatic Embryogenesis

Background:

• Somatic embryogenesis is crucial for efficient plant propagation and genetic modification in crops like peanut (Arachis hypogaea L.).
• Optimizing somatic embryo induction from mature explants is essential for developing robust regeneration protocols.

Purpose of the Study:

• To evaluate the efficacy of various auxins and a cytokinin-like compound in inducing somatic embryos from peanut epicotyls.
• To compare the performance of selected plant growth regulators across different peanut genotypes.

Main Methods:

• Mature, dry peanut epicotyls (genotype AT120) were treated with 11 auxins and one cytokinin-like compound at four concentrations.
• Picloram, centrophenoxine, and dicamba were further tested at two concentrations on four peanut genotypes (AT120, 59-4144, GK7, VC1).
• Somatic embryo induction, proliferation, and conversion to plants were assessed.

Main Results:

• Picloram and centrophenoxine at 83.0 and 124.4 μM yielded the highest number and percentage of responding explants.
• These two compounds induced similar numbers of embryos across tested genotypes, outperforming dicamba.
• Genotypes AT120 and VC1 produced more repetitive embryo clusters than GK7 and 59-4144.

Conclusions:

• Picloram and centrophenoxine are effective inducers of somatic embryogenesis in peanut epicotyls.
• The study identified promising plant growth regulators and superior genotypes for peanut regeneration.
• Successful conversion of embryos from repetitive cultures into mature plants demonstrates the viability of the protocol.