In order to investgate the promoting effect on the plants by silicate bacteria,a strain of silicate bacteria was isolated and identified,and its capability of promoting growth of watermelon was studied. Results showed that the silicate bacterium WZW03 was classified as Plantibacter sp.,then biomass of WZW03 reached to maximum at 96 hours in silicate liquid medium,and the maximum concentration of potassium was released up to 1. 41 mg·L- 1. When 30 m L of Plantibacter sp. WZW03,( two conditions: OD600= 0. 5 and OD600= 1,respectively),were applied to the soil sowed with watermelon( sterilized continuous cropping soil),the dry weights for the underground part of watermelon were increased by 18. 6% and 28. 0%,respectively,compared with control,root lengths of watermelon were increased by62. 2% and 34. 8%,root tips number of watermelon were increased 39. 0% and 32. 9%,the root diameter root ranged from 0 to 0. 5 mm were increased by 59. 7% and 55. 0%. In unsterilized soil of continuous cropping,when 30 m L of Plantibacter sp.( two conditions; OD600= 0. 5 and OD600= 1,respectively) were applied to the soil on which watermelon was grown,the fresh weights for the underground part of watermelon were increased by 22. 0% and 90. 9%,respectively; the dry weights for the underground part of watermelon were increased by 99. 3% and 215. 9%,respectively; heights of watermelon were increased 41. 0% and 12. 1%,respectively; root lengths of watermelon were increased by 111. 8% and 33. 6% respectively,the root volume of watermelon were increased by 200. 0% and 52. 9%,respectively,the root diameter root ranged from 0 to 0. 5 mm were increased by 23. 6% and 16. 4%,respectively. The data obtained in our study suggest that Plantibacter sp. WZW03 can promote the growth of watermelon and has broad promising application in the preparation of bio-bacterial manure. Further,the study indicates that the strain could be developed as a biofertilizer and provides strain resourses and theoretical a basis for further study.
Journal of Nuclear Agricultural Sciences