European Journal of Plant Pathology

, Volume 102, Issue 7, pp 663–670 | Cite as

Induced resistance againstPhytophthora capsici in pepper plants in response to DL-β-amino-n-butyric acid

  • Ji Yoon Sunwoo
  • Yeon Kyeong Lee
  • Byung Kook Hwang
Research Articles


Treatment of pepper plants with the nonprotein amino acid, DL-ß-amino-n-butyric acid (BABA) induced resistance to subsequent infection byPhytophthora capsici. In contrast, theα-, andγ-isomers of aminobutyric acid were ineffective as inducers of resistance. A relatively high concentration of BABA at 1,000μg ml−1, which had no antifungal activityin vitro againstP. capsici, was required to induce resistance against Phytophthora blight with a foliar and stem spray, thus leading to complete control of the disease. About 1 day interval between BABA-treatment and challenge inoculation was sufficient to induce resistance in pepper plants. High inoculum levels ofP. capsici caused Phytophthora development slowly in pepper stems treated with BABA, especially at early plant growth stage, which suggests that the induced resistance in pepper plants may be more quantitative rather than qualitative. BABA applied to the root system also protected pepper stems fromP. capsici infection.

Key words

Capsicum annuum DL-ß-amino-n-butyric acid Phytophthora capsici induced resistance 


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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Ji Yoon Sunwoo
    • 1
  • Yeon Kyeong Lee
    • 1
  • Byung Kook Hwang
    • 1
  1. 1.Department of Agricultural BiologyKorea UniversitySeoulKorea

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