Diversity of resistance to bacterial blight and geographical distribution of 29 populations of wild rice [ Oryza meyeria
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RESEARCH ARTICLE
Diversity of resistance to bacterial blight and geographical distribution of 29 populations of wild rice [Oryza meyeriana (Zoll. & Moritzi) Baill.] in Yunnan, China Xinxiang A . Falan Qin . Cuifeng Tang . Feifei Zhang . Chao Dong . Yayun Yang . Duanpin Zhang . Luyuan Dai
Received: 17 February 2020 / Accepted: 13 August 2020 Ó Springer Nature B.V. 2020
Abstract Oryza meyeriana (Zoll. & Moritzi) Baill. is a wild relative of cultivated rice. O. meyeriana is reported to exhibit high resistance or immunity to bacterial blight (BB), a disease caused by Xanthomonas oryzae pv. Oryzae (Xoo). To fully understand the BB resistance of O. meyeriana across multiple distribution sites in Yunnan, China, 87 accessions of 29 O. meyeriana populations were inoculated by artificial leaf cutting with the Xoo virulent 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,
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10722-020-01001-7) contains supplementary material, which is available to authorized users. X. A F. Qin D. Zhang School of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China X. A C. Tang F. Zhang C. Dong Y. Yang L. Dai (&) Biotechnology and Germplasm Resources Institute, Yunnan Academy of Agricultural Sciences/Yunnan Provincial Key Lab of Agricultural Biotechnology/Key Laboratory of Southwestern Crop Gene Resources and Germplasm Innovation, Ministry of Agriculture and Rural Affairs/Scientific Observation Station for Rice Germplasm Resources of Yunnan, Ministry of Agriculture and Rural Affairs, Kunming 650205, China e-mail: [email protected]
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 of O. meyeriana were divided into categories according to administrative region, river system, longitude, latitude, altitude and climate factors. The resistance distribution and diversity index of the 29 O. meyeriana populations were calculated. The resistance of O. meyeriana accessions 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 of O. meyeriana. There is a highly significant positive correlation between latitude and disease index. There is also a signifi
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