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Measuring Root Disease Suppression in Response to a Compost Water Extract

文献类型： 外文期刊

作者： Curlango-Rivera, Gilberto 1 ; Pew, Tom 2 ; VanEtten, Hans D. 3 ; Xiong Zhongguo 3 ; Yu, Naitong 3 ; Hawes, Martha C 1 ;

作者机构： 1.Univ Arizona, Soil Water & Environm Sci Dept, Tucson, AZ 85721 USA

2.Merlin Organ, Tucson, AZ 85718 USA

3.Univ Arizona, Sch Plant Sci, Tucson, AZ 85721 USA

4.Univ Arizona, Inst BIO5, Tucson, AZ 85721 USA

5.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Minist Agr, Key Lab Trop Crop Biotechnol, Haikou 571101, Hainan, Peoples R China

期刊名称：PHYTOPATHOLOGY （ 影响因子：4.025； 五年影响因子：4.394 ）

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收录情况： SCI

摘要： Curlango-Rivera, G., Pew, T., VanEtten, H. D., Zhongguo, X., Yu, N., and Hawes, M. C. 2013. Measuring root disease suppression in response to a compost water extract. Phytopathology 103:255-260. Commercial application of compost to prevent plant disease is hindered by variable performance. Here, we describe the use of a growth pouch assay to measure impact of a compost water extract (CWE) on root infection under controlled conditions. Most pea roots (>= 95%) inoculated with Fusarium solani or Phoma pinodella spores rapidly develop a single local lesion in the region of elongation. In the presence of CWE, infection of pea roots grown in pouches was reduced by 93 to 100%. CWE used as a drench on pea seedlings grown in sand also resulted in 100% protection but, in a heavy clay soil, infection was reduced by <50%. CWE filtered to remove microorganisms did not inhibit frequency of F. solani infection, and resulted in increased local lesion development on individual roots. CWE inhibited mycelial growth of both pea- and cucumber-infecting isolates of E solani in culture but exerted <40% protection against cucumber root infection. CWE treatment of pea but not cucumber was associated with retention of a sheath of border cells interspersed with bacteria covering the region of elongation. Growth pouch assays may provide a system to monitor effects of specific compost mixtures on root rhizosphere interactions, and to identify variables influencing disease control.

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