Breeding of Guiyu 9,a good quality conventional indica rice variety with long grain

ObjectiveHigh quality conventional indica rice varieties with long grain were bred to provide fine varie-ties for the development of high quality rice industry in Guangxi.MethodThe long-grain variety Huanghuazhan and high quality variety Liyuanzhan 1 were crossed as female parent and male parent respectively to breed new high quality conven-tional rice variety with long grain and high yield. Its comprehensive trait performance was investigated in rice variety com-parative test of Rice Research Institute,Guangxi Academy of Agricultural Sciences,Guangxi regional trial and producing trial of high quality conventional rice group and the test of planting and extensional area in northern regions and alpine re-gions of Guangxi during 2011-2016.ResultGrowth duration of Guiyu 9 were 123 d at early cropping and 108 d at late cropping. Its grain length was 7.1-7.3 mm,head rice rate 61.8%,1000-grain weight 23.5 g,grain number per panicle 160.9 and seed setting rate 76.6%. The comprehensive rice grain quality reached the first class according to rice quality standards of China.According to the variety comparative test,the average yields of Guiyu 9 in the early and late seasons were 8628.0 and 6978.0 kg/ha respectively,which increased by 11.50% and 13.50% compared to the control variety Liu-sayouzhan 202(CK). In Guangxi regional trial,the average yield of Guiyu 9 in the early and late seasons were 6426.0 and 7290.0 kg/ha,increased by 5.75% and 11.47% compared with CK. In the producing trial,average yield of Guiyu 9 in the late season was 6514.5 kg/ha,increased by 10.08% compared with CK. In the test of medium rice planting area in northern regions and alpine regions of Guangxi,the average yields of Guiyu 9 were 9235.5 and 8433.0 kg/ha. In the high-yield demonstration test in Baise City and Hechi City,the average yield of Guiyu 9 were 9836.1 and 10944.0 kg/ha. Guiyu 9 passed the approval by Guangxi Committee for Approval of Agricultural Varieties in June,2014,receiving its serial num-ber of Guangxi approved rice No.2014039. And it was authorized by New Variety Right in September,2017,receiving its patent number CNA20140926.1.ConclusionGuiyu 9 is featured by long grain,high yield and head rice rate,high rice quality,high fertilizer tolerance and lodging resistance. It is suitable for planting as early and late rice in middle and south regions of Guangxi,and as single early cropping rice or a medium rice in north regions,while as medium rice inalpinere-gions of Guangxi.