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| 1 | Differential Detection and Analysis of Pathotypes and Differentiation against Xanthomonas oryzae pv. oryzae in Southern China显示文摘Pathogenic isolates were collected from different rice-cropping regions in southern China to dissect the pathogenic disintegration and variation of Xanthomonas oryzae pv. oryzae( Xoo). Two sets of rice-Xoo differential hosts,including Chinese system with such five cultivars as IR26,Java14,Nangeng15,Tetep and Jingang 30 and international system with a series of near-isogenic lines( NILs) including IRBB5,IRBB13,IRBB3,IRBB14,IRBB2 and IR24 carrying different known resistance genes,were used to detect pathogenic disintegration for the reaction between host and pathogen with leaf-clippingmethod at the rice booting stage. The results showed the type of the pathogen were divided intosix pathotypes,i. e.,I,II,III,IV,V and IX based on the Chinese differential system,and seven pathogenicraces including R1,R2,R3,R4,R5,R8 and R10 based on the international differential system. The pathogenicity frequency of Xoo pathotypes V and IV and pathogenic races R8 and R5 were 27. 40%,19. 30% and 44. 67%,15. 34%,which were considered to be the prevailing races in southern China.Pathogenic rates of pathotypes IV,V,IX and races R8,R5 against 500 varieties derived from southern China were 96. 40%,95. 00%,50. 40%,62. 00%,and42. 60%,respectively. Among which pathotype IX was the most virulent pathotype. The pathotype V became preponderant pathotype and the new pathotype IX grew up quickly. | Shen CHEN Congying WANG Jing SU Aiqing FENG Xiaoyuan ZHU Liexian ZENG | 2018 | Agricultural Biotechnology2018，7，1： | 1 |
| 2 | The identification of Pi50(t), a new member of the rice blast resistance Pi2/Pi9 multigene family显示文摘 | Xiaoyuan Zhu Shen Chen Jianyuan Yang Shaochuan Zhou Liexian Zeng Jingluan Han Jing Su Ling Wang Qinghua Pan | 2012 | Theoretical and Applied Genetics2012，，7： | 1 |
| 3 | The identification of Pi50(t), a new member of the rice blast resistance Pi2/Pi9 multigene family显示文摘 | Xiaoyuan Zhu Shen Chen Jianyuan Yang Shaochuan Zhou Liexian Zeng Jingluan Han Jing Su Ling Wang Qinghua Pan | 2012 | Theoretical and Applied Genetics2012，，7： | 1 |
| 4 | Utilization Situation and Prospect of Gene xa5 Against Pathotype Ⅴ of Rice Bacterial Blight显示文摘In recent years,the strong virulence pathotype Ⅴ of rice bacterial blight grew up quickly in Southern China,which has become a major population and spread to the rice regions of Jiangsu and Zhejiang provinces in Southern China.Since pathotype Ⅴ caused serious bacterial blight disease in rice production regions,it is urgent to breed and promote resistant varieties against pathotype Ⅴ.The most economic and effective measure to control rice bacterial blight is to breed resistant cultivars for widely planting using resistance genes.The Institute of Plant Protection,Guangdong Academy of Agricultural Sciences,and Agricultural Science Research Institute of Panyu District of Guangzhou used IRBB5 carrying the recessive xa5 gene from IRRI that is resistant to pathotype Ⅴ to breed resistant varieties with rice blast resistance source,through hybridization,multiple cross,pedigree selection and synchronous resistance evaluation.We successfully bred series of new resistant rice varieties such as Baijiangzhan,Baijingzhan and Baisizhan,which showed resistance to strong virulence pathotype Ⅴ(grade 1-3)of bacterial blight and rice blast(mediate to high resistance),good grain quality(level 3 of rice quality of Guangdong),and yield equivalent to major cultivars(compared with region trial control cultivars of Guangdong).These new resistant varieties were promoted and planted in the strong virulence pathotype Ⅴ region along the west coast of Guangdong,which showed favorable superiority and wide application prospect in controlling rice bacterial blight with resistance varieties. | Taihui CHENG Shen CHEN Jianyuan YANG Xiaoyuan ZHU Shengyuan WU Qijin HONG Liexian ZENG | 2020 | Agricultural Biotechnology2020，9，6： | 0 |
| 5 | Resistance Analysis on Major Resistant Genes of Rice Bacterial Blight in Different Donors and Genetic Background显示文摘The different donors of eight rice bacterial blight( BB) major resistant( MR) genes,Xa3,Xa4,xa5,Xa7,Xa10,Xa11,Xa14 and Xa23,were inoculated with two Chinese Xoo strains,strain IV and strain V,respectively. The strain IV was a predominant pathotype in south China,while the strain V was a severe virulentstrain. Two susceptible sterile lines and two susceptible inbred rice were employed to study the effect of geneticbackground on expression of resistance to BB for Xa4,xa5,Xa7 and Xa23. The application value of twodominant resistant genes Xa7 and Xa23 on hybrid rice was also evaluated. The results indicated that the resistance inheritance behaviors of most of the MR genes to the Xoo strains were similar and only a few genes show contradictory reaction in different donors,which suggests that the genetic background would produce an effect on the resistant expression of some R genes. Four resistant donors,IRBB4,IRBB5,IRBB7 and CBB23,were crossed with four susceptible cultivars,WufengA,JitianA,Jingang30 and IR24,respectively,using the resistant donors as male parent. The analysis of F1 populations revealed that the recessive resistance gene xa5 and dominant resistance gene Xa23 conformed to recessive and dominant expression model,respectively,while the other two dominant resistance genes,Xa4 and Xa7,conformed to dominant expression model only in some of F1 populations but not for others. In conclusion,expression of resistance for xa5 and Xa23 was independent of genetic background,while Xa4 and Xa7 show specific behaviors of resistance related to the receptor background. This study also suggests that Xa7 is not suitable for application in hybrid rice,for the F1 generation of its cross with two male sterile lines were highly susceptible,and Xa23( CBB23) had important value in improving BB resistance of hybridrice,as the F1 generations from its cross with 4 susceptible parents,including sterile lines and inbred rice,were all show highly resistant. | Liexian ZENG Congying WANG Aqing FENG Chen SHEN Jing SU Wenjiun WANG Shengyuan WU Jianyuan YANG Xiaoyuan ZHU | 2017 | Agricultural Biotechnology2017，6，5： | 0 |
| 6 | Resistance Evaluation of Dominant Varieties against Rice Blast (Magnaporthe oryzae) and Bacterial Blight (Xanthomonas oryzae pv. oryzae) in Guangzhou, China显示文摘The resistance of dominant rice varieties in Guangzhou against rice blast(Magnaporthe oryzae)and bacterial blight(Xanthomonas oryzae pv.oryzae)were evaluated by artificial inoculation and field natural blast nursery identification.Among 11 varieties tested,seven varieties showed resistance to rice blast,accounting for 63.6%;two varieties were highly resistant,accounting for 18.2%;three varieties were resistant,accounting for 27.3%;two varieties were moderately resistant,accounting for 18.2%;four varieties were susceptible(moderately susceptible),accounting for 36.4%.Varieties showed different resistance against the prevailing pathotype IV of bacterial blight;one variety was resistant,accounting for 9.1%;three varieties were moderately resistant,accounting for 27.3%;five varieties were moderately susceptible,accounting for 45.5%;one variety was susceptible,accounting for 9.1%;one variety was highly susceptible,accounting for 9.1%;all varieties tested showed susceptible to the virulent pathotype V.Huanghuazhan,Yuejingsimiao 2 and Fengxiuzhan showed resistance against both bacterial blight(pathotype IV)and rice blast,accounting for 27.3%.It is helpful to reduce the production risk by extending such dominant rice varieties with good resistance to rice blast and bacterial blight. | Yang Jianyuan Feng Aiqing Chen Shen Li Chuanying Yang Qiyun Zeng Liexian Zhu Xiaoyuan | 2020 | Plant Diseases and Pests2020，11，3： | 0 |
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