Identification of a novel cytoplasmic male sterile line M2BS induced by partial-length HcPDIL5-2a transformation in rice (Oryza sativa L.)

다국어 초록 (Multilingual Abstract)

A cytoplasmic male sterile line (designated as M2BS) was obtained from an indica rice maintainer M2B induced by partial-length HcPDIL5-2a (Hibiscus cannabinus protein disulfide isomerase-like) transformation. The anther of M2BS was short, slender, hygrophanous, and fissured. I2-KI staining method showed that there was typical and spherical abortion in pollen grains. M2BS was found abortive at middle and late stage of monocyte by the modified carbol fuchsin stained observation and paraffin section observation. The tapetum was observed pre-degenerated in M2BS. Hereditary analysis indicated that the male sterility of M2BS was a maternally inherited inability after six backcross generations with M2B and the combinations of M2BS hybridized with other two male fertile materials. The M2BS could be affirmed a cytoplasmic male sterile (CMS) type. Moreover, it was a transgenic plant confirmed by PCR, Southern blot and RT-PCR detection. M2BS could be distinguished from M2B and its CMS line M2A by RFLP analysis. The overall mitochondrial genome sequencing results showed, that in M2BS, the main differences of mitochondrial gene sequence were located in nad4, nad5, nad7, orf194 and intergenic region, relatively to those of M2A. The obtained results indicate that M2BS is a novel cytoplasmic male sterile line.

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