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Diversity of resistance to bacterial blight and geographical distribution of 29 populations of wild rice [Oryza meyeriana(Zoll. & Moritzi) Baill.] in Yunnan, China

文献类型： 外文期刊

作者： Xinxiang, A. 1 ; Qin, Falan 1 ; Tang, Cuifeng 2 ; Zhang, Feifei 2 ; Dong, Chao 2 ; Yang, Yayun 2 ; Zhang, Duanpin 1 ; Dai 1 ;

作者机构： 1.Huazhong Agr Univ, Sch Plant Sci & Technol, Wuhan 430070, Peoples R China

2.Yunnan Acad Agr Sci, Key Lab Southwestern Crop Gene Resources & Germpl, Sci Observat Stn Rice Germplasm Resources Yunnan, Yunnan Prov Key Lab Agr Biotechnol,Biotechnol & G, Kunming 650205, Yunnan, Peoples R China

关键词： Bacterial blight (BB); Diversity; Environments; Genetic resources; Oryza meyeriana; Resistance; Wild rice

期刊名称：GENETIC RESOURCES AND CROP EVOLUTION （ 影响因子：1.524； 五年影响因子：1.713 ）

ISSN： 0925-9864

年卷期：

页码：

收录情况： SCI

摘要： Oryza meyeriana(Zoll. & Moritzi) Baill. is a wild relative of cultivated rice.O. meyerianais reported to exhibit high resistance or immunity to bacterial blight (BB), a disease caused byXanthomonas oryzae pv. Oryzae(Xoo). To fully understand the BB resistance ofO. meyerianaacross multiple distribution sites in Yunnan, China, 87 accessions of 29O. meyerianapopulations were inoculated by artificial leaf cutting with theXoovirulent strain CX28-3 isolated from rice in Yunnan. The diversity of resistance and habitat of each accession were then analysed. The results showed that resistance was variable. Among the 87 accessions, only 20.7% were resistant (12 resistant and 6 highly resistant), 37.9% were susceptible (9 highly susceptible and 24 susceptible), and the remaining 41.4% (36 accessions) were moderately resistant; no accession tested displayed immunity to CX28-3. The variation of resistance among populations is higher than within a population. The 29 populations ofO. meyerianawere divided into categories according to administrative region, river system, longitude, latitude, altitude and climate factors. The resistance distribution and diversity index of the 29O. meyerianapopulations were calculated. The resistance ofO. meyerianaaccessions was shown to be quite different among the five administrative regions. The resistance from Xishuangbanna was the strongest, followed by Pu'er, Dehong, and Lincang, while that from Baoshan was the weakest. The diversity index of resistance is highest in Pu'er (1.13), followed by Dehong (0.95), Baoshan (0.69), Lincang (0.67), and Xishuangbanna (0.64). Correlation analysis showed that geographical and climatic factors impacted the resistance ofO. meyeriana. There is a highly significant positive correlation between latitude and disease index. There is also a significant positive correlation between altitude and disease index. These results indicate that accessions ofO. meyerianaat greater latitude or altitude are more susceptible to BB. By cluster analysis of the geographical and climatic factors of theO. meyerianadistribution sites, the 29 populations were classified into five groups with differences in resistance.O. meyerianais considered nearly immune to BB, but susceptible accessions were found for the first time in Yunnan Province, China.

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