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middle susceptibility
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    solanacearum in greenhouses that clones of somatic hybrids CHT-3 and CHT-5 performed high resistance to BW, Clones CHT-11, CHT-12, CHT-16, PHT-17, PHT-24 and PHT-33 had the mid-level resistance, Clone CHT-4 was susceptible to BW while the rest showed middle susceptibility.
    1.人工接种鉴定结果表明,CHT-3、CHT-5属于抗病材料,CHT-11、CHT-12、CHT-16、PHT-17、PHT-24、PHT-33属中抗材料,CHT-4属感病材料,其余材料均属中感材料。
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    Two critical parameters disease incidence and severity were analyzed by tree diagram of cluster analysis, and 8 cluster groups for 94 varietieswere classified, which from resistance to susceptibility successively were immunity, high resistance, middle resistance, resistance, susceptibility, middle susceptibility, high susceptibility and extreme susceptibility.
    通过对各品种的发病率和严重度两项指标进行聚类分析 ,按照抗病性从高到低将 94个品种分为免疫、高抗、中抗、抗病、感病、中感、高感和极感 8个抗性类群 ;
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By means of inoculation at stages of budding and flowering,resistances of 42 rice varieties (lines)to bakanae disease were evaluated in 1991 and 1992. The results showed that rice varieties having presented middle- resistance and resistance at both stages were Har 80 - 4 - 1 ,Songgeng 2,Nenjiao 90 -038,Tengxi 140,Huinian,Song 88 - 12,Dong8613,Longhua 046,etc. 21 in all. Rice varieties having prasented susceptibility or middle - susceptibility at both stages were Dongnong 415,Dongnong...

By means of inoculation at stages of budding and flowering,resistances of 42 rice varieties (lines)to bakanae disease were evaluated in 1991 and 1992. The results showed that rice varieties having presented middle- resistance and resistance at both stages were Har 80 - 4 - 1 ,Songgeng 2,Nenjiao 90 -038,Tengxi 140,Huinian,Song 88 - 12,Dong8613,Longhua 046,etc. 21 in all. Rice varieties having prasented susceptibility or middle - susceptibility at both stages were Dongnong 415,Dongnong 417,Longhua 83 - 079,Hejiang 21, Nenjiang 90 - 47 and Har 80-4.

水稻恶苗病(Gibberellafujikuroi)是常见的水稻病害,对水稻生产威胁很大。1991~1992年作者用芽期接种方法和花期接种方法,鉴定了42个水稻品种(品系)对恶苗病的抗病性,结果表明,芽期和花期接种均表现抗病或中抗的品种有哈80—4-1、松粳2号、嫩交90-038、藤系140、恢粘、松88-12、东8613、龙花046等21份;芽期和花期接种均表现为感病或中感的品种有东农415、东农417、龙花83—079、合江21、嫩交90—47、哈80—4等。此鉴定结果可供选用品种时参考。

Ninety four alfalfa varieties which introduced from overseas and domestic regions were evaluated under alpine grassland conditions in Sangke Grassland Station, Xiahe county, Gansu province, China. The results showed that alfalfa resistance to downy mildew between varieties were quite different, the disease incidence and severity were 0~100%and 1~4, respectively. Two critical parameters disease incidence and severity were analyzed by tree diagram of cluster analysis, and 8 cluster groups for 94 varietieswere...

Ninety four alfalfa varieties which introduced from overseas and domestic regions were evaluated under alpine grassland conditions in Sangke Grassland Station, Xiahe county, Gansu province, China. The results showed that alfalfa resistance to downy mildew between varieties were quite different, the disease incidence and severity were 0~100%and 1~4, respectively. Two critical parameters disease incidence and severity were analyzed by tree diagram of cluster analysis, and 8 cluster groups for 94 varietieswere classified, which from resistance to susceptibility successively were immunity, high resistance, middle resistance, resistance, susceptibility, middle susceptibility, high susceptibility and extreme susceptibility. Among them, 14 varieties of immunity group are Algoquis, Baron, Apex, Angus, unknown(Japan), Eroqudis, Blager, Thor, 81 69 American, CP4350 Saranac, Beaver, Rambler, Range lander and Wisconsin, 4 varieties of high resistance group are Prowler, Banner, L2 1079 Hungaria and Xingping, 3 varieties of high susceptibility group are Zhaodong, Longzhong and Longdong, 5 varieties of extreme resistance group are 78 27 Czechoslovakia, Apollo, Zhungeer, Shaanbei and Hexi. The disease severity was increased from June to August during alfalfa growth period, All of immunity and most of high resistance varieties were introduced from overseas and most of extreme and all of high suspectible varieties were domestic. Such resistant difference was probably caused by the different origin of varieties.

对引自国内外的 94个苜蓿品种在海拔 30 0 0m的甘肃桑科草原试验站进行了高山草原条件下的霜霉病抗性评价。结果表明 ,品种之间的抗病性差异颇大 ,发病率为 0~ 10 0 % ,严重度为 1 4。通过对各品种的发病率和严重度两项指标进行聚类分析 ,按照抗病性从高到低将 94个品种分为免疫、高抗、中抗、抗病、感病、中感、高感和极感 8个抗性类群 ;其中 :阿尔古奎斯、巴瑞尔 ,阿毕卡、安古斯、日本 1品种、伊鲁瑰斯、布韦兹、托尔、81- 69美国、CP4 350萨蓝纳斯、贝维、润布勒、兰热来恩德和威斯康辛等 14个品种属免疫类群 ;普劳勒、班纳、L2 - 10 79匈牙利和兴平 4个品种属高抗类群 ;肇东、陇中和陇东 3个品种属高感类群 ;78- 2 7捷克、阿波罗、准格尔、陕北和河西 5个品种属极感类群。 6~ 8月份病害随着生长期的推移而呈逐渐加重的趋势。绝大多数极感品种和所有高感品种均为国内品种 ,而所有免疫品种和绝大多数高抗品种均为国外引进品种 ,这种由于品种的来源不同而引起的抗病性差异很可能与苜蓿霜霉菌的高度寄生专化性有关

Xiangfu 994"-A rice variety with good quality and early maturing characteristic was breeded with the irradiation method and hybridizing technology. It yields 6976.5kg/hm~2 and matures in 112d. It is very good in grain quality and taste of food. It has middle susceptibility to rice blast, and middle resistance to rice bacterial and brown planthopper and white-backed planthopper. It has good field resistance. The experience of the breeding and the characteristics and its exploitation, is also included....

Xiangfu 994"-A rice variety with good quality and early maturing characteristic was breeded with the irradiation method and hybridizing technology. It yields 6976.5kg/hm~2 and matures in 112d. It is very good in grain quality and taste of food. It has middle susceptibility to rice blast, and middle resistance to rice bacterial and brown planthopper and white-backed planthopper. It has good field resistance. The experience of the breeding and the characteristics and its exploitation, is also included.

利用辐射与杂交相结合的方法育成的优质早籼"湘辐994",产量为6976.5kg hm2,生育期112天,米质优良,食味好,中感稻瘟病,中抗白叶枯病、褐飞虱和白背飞虱,田间抗性好。本文介绍了该品种的选育过程、特征特性及其开发利用。

 
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