Efficacy of some rhizospheric and endophytic bacteria in vitro and as seed coating for the control of Fusarium culmorum infecting durum wheat in Tunisia
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- 作者：Nourhen Mnasri ; Cynda Chennaoui ; Samia Gargouri…
- 关键词：Antagonism ; Bacillus ; Biopriming ; Fusarium wheat disease ; Pseudomonas ; Triticum durum
- 刊名：European Journal of Plant Pathology
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：147
- 期：3
- 页码：501-515
- 全文大小：
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Plant Pathology; Plant Sciences; Ecology; Agriculture; Life Sciences, general;
- 出版者：Springer Netherlands
- ISSN：1573-8469
- 卷排序：147
文摘
Sixty two rhizospheric and endophytic bacterial strains were evaluated for their biocontrol effect on two aggressive Fusarium culmorum isolates (Fc2 and Fc3). We observed that 35 % and 23 % of the tested strains inhibited the in vitro growth of Fc2 and Fc3 respectively. The observed antagonism was due to inhibition by contact (13–19 % of the strains) or at distance (10–16 % of the strains) for both fungal isolates. Some of the antagonistic bacteria showed the ability to produce diffuse and/or volatile compounds that inhibit the growth, the sporulation and macroconidia germination of F. culmorum. None of the tested antagonistic bacteria showed chitinase activity on synthetic medium. The sequencing of the 16S rDNA genes of some antagonistic bacteria showed that they belong to the genera Bacillus, Pseudomonas and Microbacterium. The double inoculation of durum wheat seeds by the antagonistic bacterial strains (B13, B18, BSE1, BSE3 and B16E) and the two F. culmorum isolates showed that germination and seedling vigor were generally improved in vitro. The percentage of infected seeds was also reduced. In greenhouse trials, the biocontrol effectiveness of F. culmorum was dependant from the virulence of the fungal strain and the specificity of the antagonistic interaction between bacterial and fungal strains. The bacterial strains B18 and B16E reduced F. culmorum infection on durum wheat plants probably due to their antagonistic and plant growth promoting activities and they may be used in a mixture as seed biopriming inoculum for plant growth bio-promoting and Fusarium wheat diseases biocontrol.