Mitochondrial GTPase required to maintain proper development, morphology and intracellular distribution of mitochondria, which in turn are essential for the progress of embryonic cell division, development of haploid male and female gametes, and pollen tube growth. Expressed in roots, leaves, stems, flowers and siliques. Embryonic lethality between the apical 2-cell and the 4-terminal-cell embryo stage (PubMed:18344283, PubMed:20931334). Impaired in pollen germination and pollen tube growth (PubMed:18344283). Belongs to the mitochondrial Rho GTPase family.