The Plant Pathology Journal 2007;23(4):300-307.
Published online December 31, 2007.
Expression of Lily Chloroplastic Cu,Zn Superoxide Dismutase Enhances Resistance to Erwinia carotovora in Potatoes
Mi Sun Kim, Hyun Soon Kim, Yoon Sik Kim, Kwang Hyun Baek, Jae Sun Moon, Do Il Choi, Hyouk Joung, Jae Heung Jeon
Abstract
Previously, a chloroplast-localized Cu,Zn superoxide dismutase (chCu,ZnSOD) was isolated from lily and the sense- and antisense- sequences of the lily chCu,ZnSOD were used to transform potato plants. Two selected lines, the sense- and anti-sense strand of transgenic plants, were further characterized for resistance to Erwinia carotovora, which is a severe pathogen affecting potato plants. Only the sense-strand transgenic potato, which contained less O2 .- and more H2O2 than wild-type and antisense-strand transgenic plants, showed increased resistance to E. carotovora. Additional studies using O2 .- or H2O2 scavengers in wild-type, sense-strand, and antisense-strand transgenic plants suggest that resistance to E. carotovora is induced by reduced O2 .- and is not influenced by H2O2. To the best of our knowledge, this report is the first study suggesting that resistance to E. carotovora is enhanced by reduced O2 .-, and not by increased amounts of H2O2.
Key Words: Erwinia, potato, resistance, SOD, superoxide anion
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