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Assessment of gene Flow Through Detection of SexualCompatibility Between transgenic rice with barand Echinochloa crusgalli ***

引用

Agricultural Sciences in China 2002年第11期1卷 1185-1189页

作者： SONG Xiao-ling, QIANG Sheng, LIU Lin-li and XU Yan-hong(Weed Research Laboratory , Nanjing Agricultural University , Nanjing 210095 ,P. R. China) Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 P.R.China

The possibility of gene flow between two varieties of transgenic rice with bar gene (Y0003 and 99-t) (male) and barnyard grass(Echinochloa crusgalli var. mitis ) (female) was studied by means of reproductive biology. The germination and growth of rice pollen grains on barnyard grass stigmas at 30 min, and 1-4 h after crossing by hand were observed with an optical microscope. The results were compared with the germination and growth of barnyard grass pollen grains at the corresponding time after self-pollination. The results showed that germination and growth of the pollen grains of the two varieties were similar on barnyard grass stigmas, but differed significantly from self-pollination of barnyard grass. Pollen grains germinated and pollen tubes penetrated stigmas normally, and the number of pollen grains being condensing or releasing their inclusions or having released them increased with the time after self-pollination. Pollen grains of transgenic rice on the stigmas of barnyard grass couldn't germinate or grow normally after crossing, neither could they penetrate the stigmas of barnyard grass. Therefore, it could be concluded that the sexual incompatibility between transgenic rice with bar gene and barnyard grass is due to the rice pollen being unable to penetrate the stigma of barnyard grass. Further proof of incompatibility lies in the fact that the emasculated barnyard grass pollinated with the rice pollen grains could not seed.

关键词： gene flow transgenic rice with bar gene Echinochloa crusgalli var. mitis Sexual compatibility

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