Changes in Bioelectrical Indexes of Cotinus coggygria var. cinerea Inoculated with Different Fungus Strains

YOU Chong-juan; WANG Jian-mei; TIAN Cheng-ming

The paper studied the changes in bioelectrical indexes of Cotinus coggygria var. cinerea inoculated with three fungus strains isolated from infected C. coggygria var. cinerea, i.e. Verticillium dahliae, Fusarium sp. and Cylindrosporium sp., and the bioelectrical indexes, capacitance, impedance and conductivity, were tested by using the capacitance meter and electric conductivity instruments. The results indicated that the differences for the changes in bioelectrical indexes after inoculating with different fungus strains were significant,and the tree stem impedance, leaf exosmosis bioelectricity and exosmosis percentage increased gradually, while the tree stem capacitance decreased with the development of the process of infection. However, compared with inoculating with Fusarium sp., and Cylindrosporium sp., the ranges of changes in bioelectrical indexes of C. coggygria var. cinerea inoculated with V.dahliae, the main pathogens infecting C.coggygria var. cinerea, were larger, and also the changes of the tree stem impedance and tree stem capacitance showed more significant differences in 5 - 7 days after inoculation, which were 7 - 10 days earlier than the appearance of symptoms. There were evident differences between healthy and debility trees in stem impedance, tree stem capacitance and unit capacitance, and the stem impedance had more significant negative correlation with stem capacitance in infected C.coggygria var. cinerea.

1. Key Laboratory for Silviculture and Forest Conservation, Ministry of Education,Beijing Forestry University, Beijing 100083, China

Received Date: 2009-10-12

Abstract: The paper studied the changes in bioelectrical indexes of Cotinus coggygria var. cinerea inoculated with three fungus strains isolated from infected C. coggygria var. cinerea, i.e. Verticillium dahliae, Fusarium sp. and Cylindrosporium sp., and the bioelectrical indexes, capacitance, impedance and conductivity, were tested by using the capacitance meter and electric conductivity instruments. The results indicated that the differences for the changes in bioelectrical indexes after inoculating with different fungus strains were significant,and the tree stem impedance, leaf exosmosis bioelectricity and exosmosis percentage increased gradually, while the tree stem capacitance decreased with the development of the process of infection. However, compared with inoculating with Fusarium sp., and Cylindrosporium sp., the ranges of changes in bioelectrical indexes of C. coggygria var. cinerea inoculated with V.dahliae, the main pathogens infecting C.coggygria var. cinerea, were larger, and also the changes of the tree stem impedance and tree stem capacitance showed more significant differences in 5 - 7 days after inoculation, which were 7 - 10 days earlier than the appearance of symptoms. There were evident differences between healthy and debility trees in stem impedance, tree stem capacitance and unit capacitance, and the stem impedance had more significant negative correlation with stem capacitance in infected C.coggygria var. cinerea.

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Changes in Bioelectrical Indexes of Cotinus coggygria var. cinerea Inoculated with Different Fungus Strains

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