烟草黑胫病菌的寄主范围

doi:10.3864/j.issn.0578-1752.2012.05.006

Abstract

Abstract: 【Objective】The objective of this study is to explore the host range of Phytophthora parasitica var. nicotianae, aiming to provide a theoretical basis for related researches in P. parasitica var. nicotianae, and to provide a decision-making basis for integrated control of tobacco blank shank and other diseases caused by P. parasitica var. nicotianae.【Method】The host range of P. parasitica var. nicotianae was systematically studied with big samples through inoculating 61 kinds of crops and weeds with the methods of mycelium dish wounded and unwounded inoculation under the condition of manual simulation of the infection approaches in tobacco field, and then the lesions were identified through Koch’s postulates.【Result】The pathogenic microorganism could infect 51 kinds of plants from 41 genera in 21 families under the wounded condition, and could infect 16 kinds of plants from 15 genera in 10 families in unwounded inoculating condition. It was discovered for the first time that P. parasitica var. nicotianae could infect 47 kinds of plants from 40 genera in 21 families by the artificial wounded inoculation, and could infect 12 kinds of plants from 12 genera in 10 families under the condition of mycelium block unwounded inoculation. 【Conclusion】 The host range of P. parasitica var. nicotianae is wide, some of the hosts are common crops and familiar weeds in tobacco field. These plants might be infected under the conditions that are wounded during farming or by insects, or even unwounded in high temperature and high humidity in the field. Tobacco could not be rotated or intercropped with these crops. Moreover, it might be positive for the integrated management of tobacco blank shank and other diseases caused by P. parasitica var. nicotianae to control these weeds in field in time.

Key words: Phytophthora parasitica var. nicotianae, artificial inoculation, host range

MA Guo-Sheng, GAO Zhi-Mou, CAO Shun. The Host Range of Phytophthora parasitica var. nicotianae[J].Scientia Agricultura Sinica, 2012, 45(5): 867-876.

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