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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front Agric Chin    2009, Vol. 3 Issue (1) : 34-39     DOI: 10.1007/s11703-009-0006-1
Coordinated effects of root autotoxic substances and Fusarium oxysporum Schl. f. sp. fragariae on the growth and replant disease of strawberry
Xusheng ZHAO1,2, Wenchao ZHEN1,2(), Yongzhi QI1,2, Xuejing LIU1,2, Baozhong YIN1,2
1. College of Plant Protection, Agricultural University of Hebei, Baoding 071001, China; 2. Research Center for Biocontrol Techniques against Pests on Crops of Hebei Province, Baoding 071001, China
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Effects of hydroxybenzoic acid, an important autotoxic substance in roots, on plant growth, photosynthesis and Fusarium oxysporum occurrence in succession cropping of strawberry were evaluated in this paper. It was found that plant growth was negatively regulated by hydroxybenzoic acid or inoculation with F. oxysporum. Compared with these single factor treatments, the combination of the hydroxybenzoic acid treatment and F. oxysporum inoculation caused more severe inhibition in plant growth, greatly enhanced the occurrence of disease symptoms, and significantly decreased the chlorophyll content, net photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO2 concentration. In the meantime, the chlorophyll fluorescence parameters in strawberry were also significantly affected. After the application of hydroxybenzoic acid, the original chlorophyll fluorescence rapidly increased, resulting in a combined corresponding decrease in the maximum chlorophyll fluorescence and the chlorophyll fluorescence transformation efficiency. The effects of hydroxybenzoic acid treatment on the above chlorophyll fluorescence parameters from inoculation were delayed. Similarly, the coordination of hydroxybenzoic acid and F. oxysporum showed an elevated negative effect on the degree of inhibition of leaf photosynthesis more than the single factor treatments.

Keywords strawberry      autotoxic substance      Fusarium oxysporum      hydroxybenzoic acid      replant disease     
Corresponding Authors: ZHEN Wenchao,   
Issue Date: 05 March 2009
URL:     OR
treatmentroot length/cmroot numberper plantroot dry weight/gstem and leavesdry weight/gstem diameter/cmleaf areaper plant/cm2
0.3 mmol?L-1 PA14.5b25.3b2.175b1.804a1.04b78.1b
0.3 mmol?L-1 PA+FO12.4c18.8d1.225d1.377b0.91b56.9d
Tab.1  Effects of PA and on the growth of strawberry
Fig.1  Effect of PA and on the contents of chlorophyll in strawberry leaves
Fig.2  Effect of PA and on Pn of strawberry leaves
Fig.3  Effect of PA and on Tr of strawberry leaves
Fig.4  Effect of PA and on Gs of strawberry leaves
Fig.5  Effect of PA and on Ci of strawberry leaves
Fig.6  Effects of 4-Hydroxybenzoic acid and on characteristics of chlorophyll fluorescence of strawberry leaves
Fig.7  Effect of 4-hydroxybenzoic acid and on the disease index of strawberry roots
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