Genome survey sequencing-based SSR marker development and their validation in Dendrocalamus longispathus

Area of Science:

• Genomics
• Plant Science
• Conservation Biology

Background:

• Bamboo is a vital genetic resource in India, crucial for rural livelihoods and industries.
• Most Indian bamboo species lack essential genomic and marker information for effective conservation and management.
• Dendrocalamus longispathus is a socioeconomically important bamboo species in Northeast India.

Purpose of the Study:

• To perform genome survey sequencing for de novo development of Simple Sequence Repeat (SSR) markers in Dendrocalamus longispathus.
• To mine and characterize microsatellite repeats within the D. longispathus genome.
• To develop and validate polymorphic SSR markers for population genetic analysis.

Main Methods:

• Genome survey sequencing using the Illumina platform.
• Bioinformatic analysis to assemble reads, identify SSR loci, and design primer pairs.
• Polymerase Chain Reaction (PCR) amplification and validation of SSR loci.
• Population genetic analysis using polymorphic SSR markers.

Main Results:

• Generated 69.49 million raw reads, assembled into 1,145,321 contigs.
• Mined 46,984 microsatellite repeats, with di-nucleotide repeats being most abundant.
• Successfully tagged 21,596 SSR loci, with 16 validated polymorphic markers.
• Detected moderate gene diversity (He=0.480) and high gene flow (Nm=4.928) but significant inbreeding (F_IS=0.407).
• Genetic clustering revealed two major gene pools within the analyzed populations.

Conclusions:

• A comprehensive set of novel SSR markers has been developed for Dendrocalamus longispathus.
• These markers provide valuable genetic insights for the conservation and management of this species.
• The findings contribute to understanding the genetic diversity of tropical woody bamboos.