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Chemical and Biological Technologies in Agriculture
Fig. 4 | Chemical and Biological Technologies in Agriculture

Fig. 4

From: Humic substances trigger plant immune responses

Fig. 4

Phenylalanine ammonia-lyase (PAL), Peroxidase (POX) and β-1,3-glucanase (B GLUC) activities in leaflets of two commercial orchards treated continuously for 12 (cv Valencia) and 6 (cv Pera Natal) years with humic substances. The activities concerning control plants in adjacent areas were normalised and not treated with humic substances. The orchards are located in São Paulo state, Brazil

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