GSE110483
The underlying pathway involved in inter-subspecific hybrid male sterility in rice
Asian cultivated rice (Oryza sativa L.) consists of two major subspecies, indica and japonica. Inter-subspecific hybrids between indica and japonica, usually accompanying hybrid sterility, exhibit much more vigorous heterosis than intra-subspecific hybrids. f5 locus, also called S24 or Sb, confers significant effects on hybrid male sterility and segregation distortion. BC14F2 plants with f5-i/i, f5-j/j and f5-i/j genotype respectively, were used to dissect the underlying pathway of f5-caused hybrid male sterility via comparative transcriptome analysis. 350, 421, and 480 differentially expressed genes (DEGs) were identified from f5-i/j vs. f5-j/j, f5-j/j vs. f5-i/i, and f5-i/j vs. f5-i/i respectively. 145 DEGs demonstrated simultaneously differential expression in both f5-i/j vs. f5-j/j and f5-i/j vs. f5-i/i. Enrichment analysis with MapMan and AgriGO indicated that protein and DNA metabolism, and cell control related processes were enriched in the 145 DEGs. Stress and cell control related processes were enriched in the DEGs of f5-i/j vs. f5-j/j and f5-i/j vs. f5-i/i, whereas, these two processes were not enriched in the DEGs of f5-j/j vs. f5-i/i. Biotic and abiotic stress resistance genes were suppressed, which may result in pollen cell more sensitive to various stresses. The down regulation of ascorbate peroxidase (APX) may break the dynamic homeostasis of ROS (reactive oxygen species) and cause oxidative stress, which can damage cellular components. The expression of most of the heat shock protein (HSP) genes, which can protect proteins and cells from been destroyed, were also decreased. Based on these results, a model was proposed to summarize the underlying process for f5-caused rice hybrid male sterility. These results provide significant clues to further dissecting the molecular mechanism of f5-caused intersubspecific reproductive barrier. Overall design: BC14F2 plants with f5-i/i, f5-j/j and f5-i/j genotype respectively, were used to dissect the underlying pathway of f5-caused hybrid male sterility via comparative transcriptome analysis.