DNA methylation in sugarcane somaclonal variants assessed through methylation-sensitive amplified polymorphism

Area of Science:

• Plant Biotechnology
• Epigenetics
• Molecular Biology

Background:

• Micropropagation enables large-scale multiplication of superior plant genotypes.
• Somaclonal variation, often linked to DNA methylation changes, is a significant drawback in micropropagation.
• Understanding epigenetic alterations is crucial for maintaining genetic fidelity in tissue-cultured plants.

Purpose of the Study:

• To investigate DNA methylation pattern changes in sugarcane somaclonal variants.
• To assess the efficacy of the methylation-sensitive amplified polymorphism (MSAP) technique for detecting these variations.
• To evaluate the genetic stability of micropropagated sugarcane plantlets.

Main Methods:

• Applied the MSAP technique using EcoRI/MspI and EcoRI/HpaII restriction enzymes on four sugarcane clones.
• Screened mother plants, in vitro normal plantlets, and in vitro abnormal plantlets (somaclonal variants).
• Analyzed MSAP-derived markers to quantify polymorphism and genetic similarity.

Main Results:

• MSAP analysis generated 1005 (EcoRI/HpaII) and 1200 (EcoRI/MspI) polymorphic markers.
• Polymorphism percentages were 28.36% (EcoRI/HpaII) and 40.67% (EcoRI/MspI).
• Abnormal plantlets exhibited a higher rate of hypomethylation than hypermethylation compared to mother plants.

Conclusions:

• The MSAP technique is a valuable tool for early detection of genetic instability in micropropagated sugarcane.
• DNA methylation alterations, particularly hypomethylation, are associated with somaclonal variation in sugarcane.
• MSAP can aid in ensuring the genetic fidelity of plants produced through tissue culture.