复交改良选育保持系转育D奇宝A和D宝A新不育系及其配组表现

New Sterile Line D Qibao A and D Bao A Selected and Transbred from Improved Multiplecross B Line and Their Combinations Expression

Ｄ奇宝Ａ和Ｄ宝Ａ新不育系，是通过复交改良龙特甫Ｂ、珍汕Ｂ、红突３１Ｂ和Ｄ２９７Ｂ转育而成。具有比珍汕Ａ异交率高、抗性好、米质优、配合力强的特点。实践再次证明，通过复交改良保持系，是培育新不育系和配组选育杂交稻新组合的重要途径。

The new sterile lines D Qibao A and D Bao A were bred through multiple crossing and improving Longtebu B, Zhenyou B, Hongtu 31B and D297B, with characters of higher exogamy rate, better resistance, rice quality and combining ability as compared with Zhenshan A. Practice further proved multiple crossing to improve B line was an important access to breed new sterile line and select new hybrid combination.