MicroRNAs Involved in Regulatory Cytoplasmic Male Sterility by Analysis RNA-seq and Small RNA-seq in Soybean.

Area of Science:

• Plant Biology
• Genetics
• Molecular Biology

Background:

• Cytoplasmic male sterility (CMS) is crucial for hybrid breeding, but its regulatory network in plants is not fully understood.
• Identifying genes and regulatory elements involved in CMS is essential for improving crop traits through heterosis exploitation.

Purpose of the Study:

• To identify microRNAs (miRNAs) and their target genes in a soybean cytoplasmic male sterility (CMS) line (JLCMS9A) and its maintainer line (JLCMS9B).
• To elucidate the roles of miRNAs in the soybean CMS regulatory network and reproductive development.

Main Methods:

• High-throughput sequencing and degradome analyses were employed to identify miRNAs and their targets.
• RNA-sequencing (RNA-seq) was used to identify differentially expressed genes during reproductive development.
• Bioinformatic analyses were performed to predict miRNA targets and construct regulatory networks.

Main Results:

• A total of 280 known miRNAs and 410 novel low-abundant miRNAs were identified in soybean flower buds.
• Degradome analysis predicted 303, 462, and 782 unique and common target genes for JLCMS9A and JLCMS9B.
• Differentially expressed target genes involved in diverse functions, including transcriptional regulation, meristem maintenance, and anther development, were identified.

Conclusions:

• MicroRNAs (miRNAs) likely contribute to the soybean CMS regulatory network by modulating the expression of CMS-related genes.
• The comprehensive dataset provides valuable insights for soybean hybrid breeding and future research into CMS molecular mechanisms.