Long noncoding RNAs in Brassica rapa L. following vernalization

Area of Science:

• Plant Molecular Biology
• Agricultural Science
• Genomics

Background:

• Brassica rapa L. requires cold for flowering (vernalization).
• Long noncoding RNAs (lncRNAs) are implicated in plant responses to cold and abiotic stress.
• Understanding lncRNA roles in vernalization is key for crop improvement.

Purpose of the Study:

• To identify and characterize lncRNAs involved in vernalization in Chinese cabbage (B. rapa L.).
• To investigate the relationship between lncRNA and mRNA expression during cold treatment.
• To explore the role of natural antisense transcripts (NATs) in cold response and vernalization.

Main Methods:

• Transcriptome analysis of Chinese cabbage inbred line RJKB-T24 under cold treatment.
• Identification and quantification of long intergenic noncoding RNAs (lincRNAs), natural antisense transcripts (NATs), and intronic noncoding RNAs (incRNAs).
• Differential gene expression analysis of lncRNAs and mRNAs in response to four weeks of cold exposure.

Main Results:

• Identified 1,444 lincRNAs, 551 NATs, and 93 incRNAs.
• 549 lncRNAs showed altered expression after four weeks of cold treatment.
• Most lncRNA and mRNA expression changes were independent, but some NATs showed coordinated expression with abiotic stress-related genes.
• Identified cold-induced NATs in BrFLC and BrMAF genes, crucial for vernalization.

Conclusions:

• A significant number of lncRNAs are differentially expressed during cold treatment in Brassica rapa L.
• lncRNAs and their associated NATs may play independent and coordinated roles in the vernalization response.
• The identified lncRNAs and their functions in vernalization appear distinct from those in Arabidopsis thaliana, highlighting species-specific regulatory mechanisms.