[Objective] The research aimed to map QTL for the sensitivity of the traits related outcrosssing of Japonica rice to exogenous GA3 and provide theoretical basis for breeding and improving the high-sensitivity sterile ...[Objective] The research aimed to map QTL for the sensitivity of the traits related outcrosssing of Japonica rice to exogenous GA3 and provide theoretical basis for breeding and improving the high-sensitivity sterile line.[Method] Taking Japonica rice Xiushui 79 and C bao and their recombinant inbred line population 260 lines as test materials,the sensitivity of 4 traits related outcrossing to Exogenous GA3 and their QTL mapping were studied by using composite interval mapping..[Result]Three QTLs,which cont...展开更多
[ Objective ] The insecticidal and antibacterial bioactivity of Wikstroemia chamaedaphne Meissn were screened and bioactive substances in it were separated and purified. [ Method] The Wikstroemia chamaedaphne Meissn w...[ Objective ] The insecticidal and antibacterial bioactivity of Wikstroemia chamaedaphne Meissn were screened and bioactive substances in it were separated and purified. [ Method] The Wikstroemia chamaedaphne Meissn was conducted ultrasonic extraction in petroleum ether, ethyl acetate and methanol. The insecticidal activity of Wikstroemia chamaedaphne Meissn to Mythimna separata walker and aphid were determined. The antibacterial activity of Wikstroemia chamaedaphne Meissn to Fusarium graminearu, Glomerella cingulata, F. oxysporium f. sp niveum, Alternaria solani and Fusarium oxysporium were also determined. The bioactivity-guided methods such as opencolumn chromatography and Pre-HPLC method were used to separate active components in petroleum ether extract from Wikstroemia chamaedaphne Meissn. [ Result] When the concentration was 500 mg/L, 3 kinds of extracts from Wikstroemia chamaedaphne Meissn didn＇ t show obvious antibacterial bioactivity to 5 kinds of test samples. When the concentration was 5%, petroleum ether extract show certain topical toxicity to aphids. The ethyl acetate extract showed certain antifeedant activity to 3^rd instar Larvae of Mythimna separata Walker. The fraction F4 of petroleum ether extract possessed highest topical toxicity to aphids and the lethality was 60.00%. [ Conclusion] Wikstroemia chamaedaphne Meissn contained many insecticidal constituents whose active parts and mechanism were needed further researches.展开更多
China＇s trade deficit in agricultural products dropped to US$ 490 million in the first five months, down 67.2% from the same period last year as export growth ＇outpaced imports, according to figures from the Ministr...China＇s trade deficit in agricultural products dropped to US$ 490 million in the first five months, down 67.2% from the same period last year as export growth ＇outpaced imports, according to figures from the Ministry of Agriculture.展开更多
基金Supported by Universities Discipline Innovation and Intellectual Introduction Program Funded Projects(B08025)Key Projects of Basic Scienceand Technology Platform of Ministry of Education(505005)Ministry ofAgriculture Project"948"(2006-G8(4)-31-1)~~
文摘[Objective] The research aimed to map QTL for the sensitivity of the traits related outcrosssing of Japonica rice to exogenous GA3 and provide theoretical basis for breeding and improving the high-sensitivity sterile line.[Method] Taking Japonica rice Xiushui 79 and C bao and their recombinant inbred line population 260 lines as test materials,the sensitivity of 4 traits related outcrossing to Exogenous GA3 and their QTL mapping were studied by using composite interval mapping..[Result]Three QTLs,which cont...
基金Supported by School Project of Yan’an University (YD2005-042)~~
文摘[ Objective ] The insecticidal and antibacterial bioactivity of Wikstroemia chamaedaphne Meissn were screened and bioactive substances in it were separated and purified. [ Method] The Wikstroemia chamaedaphne Meissn was conducted ultrasonic extraction in petroleum ether, ethyl acetate and methanol. The insecticidal activity of Wikstroemia chamaedaphne Meissn to Mythimna separata walker and aphid were determined. The antibacterial activity of Wikstroemia chamaedaphne Meissn to Fusarium graminearu, Glomerella cingulata, F. oxysporium f. sp niveum, Alternaria solani and Fusarium oxysporium were also determined. The bioactivity-guided methods such as opencolumn chromatography and Pre-HPLC method were used to separate active components in petroleum ether extract from Wikstroemia chamaedaphne Meissn. [ Result] When the concentration was 500 mg/L, 3 kinds of extracts from Wikstroemia chamaedaphne Meissn didn＇ t show obvious antibacterial bioactivity to 5 kinds of test samples. When the concentration was 5%, petroleum ether extract show certain topical toxicity to aphids. The ethyl acetate extract showed certain antifeedant activity to 3^rd instar Larvae of Mythimna separata Walker. The fraction F4 of petroleum ether extract possessed highest topical toxicity to aphids and the lethality was 60.00%. [ Conclusion] Wikstroemia chamaedaphne Meissn contained many insecticidal constituents whose active parts and mechanism were needed further researches.
文摘China＇s trade deficit in agricultural products dropped to US$ 490 million in the first five months, down 67.2% from the same period last year as export growth ＇outpaced imports, according to figures from the Ministry of Agriculture.
