| Expression of Lily Chloroplastic Cu,Zn Superoxide Dismutase Enhances Resistance to Erwinia carotovora in Potatoes |
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Mi Sun Kim, Hyun Soon Kim, Yoon Sik Kim, Kwang Hyun Baek, Jae Sun Moon, Do Il Choi, Hyouk Joung, Jae Heung Jeon |
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| Abstract |
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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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