Identification and characterization of a temperature sensitive chlorotic soybean mutant

Area of Science:

• Plant genetics
• Molecular biology
• Agricultural science

Background:

• A novel recessive chlorotic phenotype, designated vir1, was identified in a transposon-mutagenized soybean population.
• The vir1 phenotype is characterized by reduced plant stature, weaker stems, and underdeveloped root systems with smaller nodules.

Approach:

• Genome sequencing and amplicon sequencing were employed to identify causative mutations.
• Single-cell transcriptomics and RNA sequencing were used to characterize gene expression patterns.
• Functional validation was performed using homologous gene complementation in Arabidopsis.

Key Points:

• A single-base change in the soybean gene Glyma.07G102300 was identified as the likely cause of the vir1 phenotype, disrupting intron splicing.
• Glyma.07G102300 is primarily expressed in mesophyll cells and its expression is upregulated by cold stress in seedlings.
• The rice homolog of Glyma.07G102300 also exhibits temperature-sensitive chlorotic phenotypes, suggesting conserved function.

Conclusions:

• The mutation in Glyma.07G102300 is confirmed as causal for the vir1 phenotype through genetic and molecular evidence.
• The vir1 gene plays a crucial role in soybean development and exhibits sensitivity to cold temperatures.
• This discovery provides a new target for improving soybean resilience and yield under environmental stress.