breeder seed

It is suggested applying 4 stage procedures of Breeder's Seed → Foundation Seed → Registered Seed → Certified Seed.

建议采用育种者种子→原原种→原种→良种四级程序。

The system of the plant-line cycle method and low temperature and low humidity preservation of the breeder seed is introduced.

育种家种子的保存，应建立株系（行）循环法和低温低湿库双重保存制度。

Glutamine syntheses rose at first and in a stable higher level gradually later. Alpha amylase and inverts activity was rose at first, then decreased ( the breeder seed of Mira had been rising).

谷氨酰胺合成酶活性先升高后逐步稳定在一较高水平，α-淀粉酶和蔗糖酶活性则先升高后降低（米拉原原种一直呈上升趋势）。

When mechanical contamination is completely eradicated in the process of wheat seed reproduction by the technology of no-removing the off-types, the purity of foundation seeds and certified seeds are mainly determined by two factors of the breeder seed purity and the natural cross-pollination rate.

采取免去杂技术繁殖小麦种子时，决定所繁殖原种和良种纯度的2个主要因素是繁殖种纯度和品种天然异交率。