Wide crossing diversify mitogenomes of rice

Area of Science:

• Plant genetics
• Mitochondrial genomics
• Molecular biology

Background:

• Mitochondrial genomes (mitogenomes) are typically maternally inherited in angiosperms.
• Limited data exists on structural variations in mitogenomes between maternal parents and progeny.

Purpose of the Study:

• To investigate structural variations in rice mitochondrial genomes.
• To understand the mechanisms causing mitogenome heterogeneity in rice.

Main Methods:

• Comparative analysis of mitogenomes from maternal rice parents and their backcross inbred lines (BILs).
• Identification of structural variations including reversal, translocation, fusion, and fission.
• Analysis of repeat-mediated recombination and non-homologous end-joining.

Main Results:

• Significant structural variations were observed in the mitogenomes of rice BILs.
• Repeat-mediated recombination and non-homologous end-joining were key drivers of mitogenome rearrangement.
• Variations in gene order, copy number, expression, and RNA editing rates were found among BILs.

Conclusions:

• Novel insights into the mechanisms of maternal inheritance and mitogenome heterogeneity in rice.
• Findings enhance understanding of plant nucleo-cytoplasmic interactions and their role in development.