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在水稻“三系”育种工作中,测交和回交都以不育系或不育株为母本,不用温汤去雄。为了提高工作效率,不受水稻开花时间较短的限制,一般都采用剪颖授粉法取得较多的杂交种子。但剪颖授粉法所得种子,发芽率和成苗率较低,一般发芽率只有20-30％,成苗率则更低些。为了克服剪颖授粉法种子发芽率和成苗率低的缺点,不少单位曾采取剪颖授粉后用双层纸袋套袋的方法,即在稻穗外先套一个透明纸袋,然后再加套一个牛皮纸袋,这样在授粉结实率和种籽饱满度方面虽有显著提高,但
In the rice “three lines” breeding work, the test and backcross are sterile lines or sterile lines as the female parent, without Wen Tang to male. In order to improve work efficiency, not limited by the shorter flowering time of rice, the shear-pollination method is generally used to obtain more hybrid seeds. But shearing pollination obtained seeds, germination rate and seedling rate is low, the general germination rate of only 20-30%, the rate of seedlings is even lower. In order to overcome the shortcoming of the seed germination rate and seedling rate of shearing pollination method, many units took the method of bagging with double-layer paper bag after shearing pollination, that is, setting a transparent paper bag outside the ear of rice and then adding a set of transparent paper bag A kraft paper bag, so that in the pollination rate and seed fullness although significantly improved, but