Seed weight differences between wild and domesticated soybeans are associated with specific changes in gene...

Area of Science:

• Plant Genomics and Molecular Biology
• Crop Domestication and Breeding

Background:

• Soybean (Glycine max) domestication has led to significant phenotypic changes, notably increased seed weight in cultivated varieties compared to wild ancestors.
• Understanding the genetic and molecular basis of these seed weight differences is crucial for improving soybean yield and quality.

Purpose of the Study:

• To systematically identify candidate genes and molecular pathways responsible for seed weight variation during soybean domestication.
• To investigate the potential role of long noncoding RNAs (lncRNAs) in soybean seed weight regulation.

Main Methods:

• Strand-specific RNA sequencing was performed on seed transcriptomes from thirteen soybean samples (six landraces, seven wild accessions).
• Differential gene expression analysis was conducted to identify genes related to seed weight.
• De novo identification and expression profiling of lncRNAs (lincRNAs, intronic RNAs, antisense lncRNAs) were performed.
• Gene transcript and lincRNA co-expression network analysis was utilized to infer functional roles.

Main Results:

• Several differentially expressed genes related to seed weight were identified, with some homologs known to be involved in Arabidopsis seed development.
• A total of 1251 lincRNAs, 243 intronic RNAs, and 81 antisense lncRNAs were identified.
• Expression patterns of numerous lncRNAs were found to be sample-specific between cultivated and wild soybeans.
• Co-expression network analysis indicated that some soybean lincRNAs may function as hubs within co-expression modules, suggesting regulatory roles.

Conclusions:

• The study systematically explored genes and pathways contributing to seed weight differences in domesticated soybeans.
• lncRNAs were identified as potential contributors to seed weight variation, with some exhibiting sample-specific expression and network hub characteristics.
• These findings provide a valuable resource for future research in soybean molecular breeding aimed at enhancing seed traits.