北方水稻
北方水稻
북방수도
NORTH RICE
2012年
6期
12-14,22
,共4页
龙凤胎%温敏不育系%反温敏不育系%逐代展开法%临界温度%起点温度
龍鳳胎%溫敏不育繫%反溫敏不育繫%逐代展開法%臨界溫度%起點溫度
룡봉태%온민불육계%반온민불육계%축대전개법%림계온도%기점온도
Twins%Temperature sensitive sterile line%Anti-temperature sensitive sterile line%Generation to generation expansion method%Critical temperature%The starting temperature
2003年在01-124稻田里发现不育株36-20S后,先后两年南北两地高低温条件下未得到不育株种子,因而采用＂逐代展开法＂保留其不育基因。2011年9月,发现其杂交后代不育株率高达42%。利用冬季南滨变温幅度大的条件,观察x186不育株稻茬、可育株单株和同代原种不育株的育性。结果表明x186G1S、x186HS是温敏不育系,起点温度为21～22℃,x186G2S、x186-1S、x186-2S是反温敏不育系,临界温度为25～26℃。x186同时含有温敏型不育基因和反温敏不育基因,因而称作＂龙凤胎＂。同时选育育性类型截然不同的两系不育系,既拓宽时空,又便于制、繁种。反温敏不育系的选育及应用,将为两系法杂交粳稻育种的发展和杂交粳稻的推广应用带来变革,x186便是北方早粳稻区两系法育种的拐点。
2003年在01-124稻田裏髮現不育株36-20S後,先後兩年南北兩地高低溫條件下未得到不育株種子,因而採用＂逐代展開法＂保留其不育基因。2011年9月,髮現其雜交後代不育株率高達42%。利用鼕季南濱變溫幅度大的條件,觀察x186不育株稻茬、可育株單株和同代原種不育株的育性。結果錶明x186G1S、x186HS是溫敏不育繫,起點溫度為21～22℃,x186G2S、x186-1S、x186-2S是反溫敏不育繫,臨界溫度為25～26℃。x186同時含有溫敏型不育基因和反溫敏不育基因,因而稱作＂龍鳳胎＂。同時選育育性類型截然不同的兩繫不育繫,既拓寬時空,又便于製、繁種。反溫敏不育繫的選育及應用,將為兩繫法雜交粳稻育種的髮展和雜交粳稻的推廣應用帶來變革,x186便是北方早粳稻區兩繫法育種的枴點。
2003년재01-124도전리발현불육주36-20S후,선후량년남북량지고저온조건하미득도불육주충자,인이채용＂축대전개법＂보류기불육기인。2011년9월,발현기잡교후대불육주솔고체42%。이용동계남빈변온폭도대적조건,관찰x186불육주도치、가육주단주화동대원충불육주적육성。결과표명x186G1S、x186HS시온민불육계,기점온도위21～22℃,x186G2S、x186-1S、x186-2S시반온민불육계,림계온도위25～26℃。x186동시함유온민형불육기인화반온민불육기인,인이칭작＂룡봉태＂。동시선육육성류형절연불동적량계불육계,기탁관시공,우편우제、번충。반온민불육계적선육급응용,장위량계법잡교갱도육충적발전화잡교갱도적추엄응용대래변혁,x186편시북방조갱도구량계법육충적괴점。
The sterile lines 36-20S was found in 01-124 paddy fields in 2003 which had no sterile seeds in a two years test under the north-south and low-high temperature condition.In order to retain its sterile gene,the "generational expansion method" was used.The hybrid sterility rate was as high as 42% in Sep.2011.By using the broad temperature variation in the winter of Nanbin,the rice stubble of sterile rice line X186,fertile individuals and the fertility of the original sterile individuals of the same generation were observed.The results showed that X186G1S and x186HS were temperature sensitive.The starting temperature was 21-22 ℃.X186G2S,x186-1S and X186-2S were antitemperature sensitive sterile line.The critical temperature was 25~26℃.X186 was named as "twins" since it contains both temperature sensitive sterile gene and anti-temperature sensitive sterile gene.The development of the anti temperature sensitive line X186-1S eliminated the bottleneck of the two-line hybrid rice breeding in the northeast early Japonica rice district.
