Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (1): 77-86.DOI: 10.3969/j.issn.1004-1524.2021.01.10

• Plant Protection • Previous Articles     Next Articles

Colonization of fluorescently labeled Bacillus amylolyticus WK1 in Carya cathayensis Sarg. and soil

GAO Jing(), FANG Wei, GU Jiayue, YAN Shuxian, SHAO Shuai, LIANG Chenfei, QIN Hua, CHEN Junhui, XU Qiufang*()   

  1. Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China
  • Received:2020-07-06 Online:2021-01-25 Published:2021-01-25
  • Contact: XU Qiufang

Abstract:

In order to determine the colonization dynamics and the best way of Bacillus amylolyticus WK1 inoculation in hickory (Carya cathayensis Sarg.) and soil, electric shock transformation method was used to introduce green fluorescent protein (GFP) particles to construct the fluorescent labeled strain (GFP-WK1). The liquid GFP-WK1 was inoculated by leaf spraying, root irrigation and trunk injection, and the colonization number of GFP-WK1 strain was determined in soil, roots and leaves of hickory at regular intervals during 60 days. The liquid GFP-WK1 was added to soil with pH of 5.6, 6.8 and 7.9, respectively, in order to find the suitable soil pH for WK1 colonization. The results showed that GFP-WK1 could be colonized in both soil and inner tissues of hickory trees by leaf spraying, root irrigation and trunk injection, which indicated its good mobility between soil and hickory tree as well as inner tissues. The GFP-WK1 was maintained in the range of 104-106 CFU·g-1 during 60 days. Compared with root irrigation and leaf spraying, GFP-WK1 strain was more stable in hickory tree and soil by trunk injection. The GFP-WK1 was more abundant in soil with pH of 6.8. The colonization number in hickory seedlings decreased in the order of roots>stems>leaves. It was recommended to inoculate GFP-WK1 by root irrigation in respect to colonization effect in tissue and the convenience of application in short-term, combined with adjusting soil pH to 6.8. For the long-term consideration, trunk injection was a better choice.

Key words: Carya cathayensis Sarg., Bacillus amylolyticus, dry rot, green fluorescent protein, colonization

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