华北地区两系杂交水稻研究中的若干问题

华北的京、津、唐地区既有长光，又有相应的高温，两系杂交稻研究有可能在近期取得突破。华北地区应以光敏为主，而不是温敏。起点温度以２２～２３℃为宜。选育有实用价值的粳型两系应注意解决异交结实率、杂种优势、抗性等问题。

Several Problems in the Studying of Two Line Hybride Rice in the North of China

here　are　both　long　photoperiod　and　high　temperature,as　well　as　the　strong　studying　potentiality　in　Beijing,　Tianjin　and　Tangshan　area　of　the　north　of　China.　So　it　is　possible　that　the　two　line　hybride　rices　research　will　get　a　break　through　in　recent　years.The　photo sensitive　male　sterile　line　should　be　given　the　first　place　in　the　north　of　China,　but　not　the　thermo sensitive　one.　The　critical　temperature　of　fertility　alleration　is　suitable　among　22～23℃.　Selecting　and　breeding　practical　japonica　photo sensitive　male　sterile　line,　eleven　problems　should　be　solved,　such　as　out　crossing　rate,heterosis,resistance,and　so　on.