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Sisal hybrid variety of H.11648 is the main cultivated commercial variety in China. Despite of its ability to produce high fibre yield per unit area, this variety is highly susceptible to diseases. Sisal zebra disease, caused by Phytophthora nicotianae is among the diseases of economic importance affecting the variety. Several control measures like the adoption of good agricultural practices, the use of disease resistant variety and the use of chemical control are suggested in sisal zebra disease control. However, none of them seem to be sustainable due to the existing agricultural practices. Most of the existing measures are not only time-consuming but also costly due to labor intensification and high cost of purchasing agricultural chemicals which on another hand can pollute the environment and create resistance to the plants. Developing resistance variety will obviously take long time due to the long life cycle of sisal. It is very important to develop sustainable disease control methods which are environmental friendly to adopt the climate change agenda. The use of microorganisms to control the diseases is of great importance. In this study, an antagonistic strain PaHNHK01 was successfully isolated by using Phytophthora nicotianae as the target pathogen. PaHNHK01 was identified as Pseudomonas aeruginosa based on morphological, physiological and biochemical characteristics and gene sequence analysis. The antibacterial activity and control effect of PaHNHK01 were measured under in vitro condition. The results showed that, PaHNHK01 had the ability of organophosphorus and inorganic phosphorus, nitrogen fixation and iron production. Additionally, PAHNHK01 had the inhibition rate of 89.79% against P. nicotianae. The fungus effectively inhibited the mycelial growth of P. nicotianae, and the antagonistic pathogens showed decreased sporulation ability, mycelial enlargement deformity and increased branching. The control effect of PaHNHK01 on sisal zebra disease in vitro was 88.62%. PaHNHK01 aseptic fermentation liquid had obvious bacteriostatic effect on pathogenic bacteria, and its EC50 value was 20.3679 μL/mL. When the concentration of PaHNHK01 crude extract was 80 μg/mL, the antibacterial rate was 89.36%, and the EC50 value of PaHNHK01 crude extract was 11.9456 μg/mL. We further observed the antagonistic effects of the strain PaHNHK01 on 13 different plant pathogens, indicating that the strain PaHNHK01 had good biocontrol potential and could be developed as a biocontrol product. The results would provide a strong research basis for the biological control of sisal zebra disease.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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