miR156-SPL modules regulate induction of somatic embryogenesis in citrus callus

Area of Science:

• Plant Molecular Biology
• Biotechnology
• Agricultural Science

Background:

• Somatic embryogenesis (SE) is crucial for citrus in vitro regeneration.
• Declining SE potential during long-term sub-culturing hinders citrus biotechnology.
• miR156 is a conserved plant miRNA with diverse developmental roles.

Purpose of the Study:

• To investigate the role of miR156 in regulating somatic embryogenesis (SE) in citrus.
• To identify molecular mechanisms underlying miR156-mediated enhancement of SE competence.

Main Methods:

• Overexpression of csi-miR156a and knock-down of target genes (CsSPL3, CsSPL14) in wild kumquat callus.
• RNA sequencing (RNA-seq) to explore biological processes affected by miR156 overexpression.
• Identification of interacting proteins using molecular techniques.

Main Results:

• Overexpression of csi-miR156a or knock-down of CsSPL3/CsSPL14 significantly enhanced SE competence in citrus callus.
• miR156-SPL modules impact hormone signaling, stress responses, DNA methylation, and cell cycle during SE induction.
• CsAKIN10 was identified as an interacting protein of CsSPL14.

Conclusions:

• miR156-SPL modules play a key role in enhancing citrus callus SE potential.
• Understanding this regulatory pathway provides a theoretical basis for improving plant SE competence.
• This study offers insights for advancing citrus biotechnology and regeneration strategies.