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Background  Mitochondria play a significant role in plant cytoplasmic male sterility (CMS). In our previous study, mitochondrial complex I genes,  nad4 ,  nad5 , and  nad7  showed polymorphisms between the transgenic CMS line M2BS and its wild type M2B. The sterility mechanism of the M2BS at cytological, physiological, biochemical, and molecular level is not clear.    Results  Cytological observation showed that the anthers were light yellow, fissured, invalid in KI-I 2 , and full of irregularly typical abortion pollen grains in M2BS. Transmission electron microscopic (TEM) observation revealed no nucleus and degraded mitochondria with obscure cristae in anther cells of M2BS. The results of staining for H 2 O 2  presented a large number of electron dense precipitates (edp) in intercellular space of anther cells of M2BS at anthesis. Moreover, the anther respiration rate and complex I activity of M2BS were significantly lower than those of wild type M2B during pollen development. Furthermore, RNA editing results showed only  nad7  presented partially edited at 534th nucleotides. The expression of  nad5  and  nad7  revealed significant differences between M2B and M2BS.    Conclusions  Our data demonstrated that mitochondrial structural degradation and complex I deficiency might be associated with transgenic CMS of rice.

Degradation of mitochondrial structure and deficiency of complex I were associated with the transgenic CMS of rice