https://scholars.lib.ntu.edu.tw/handle/123456789/380752
標題: | Auxin influences symptom expression and phytoplasma colonisation in periwinkle infected with periwinkle leaf yellowing phytoplasma | 作者: | Tai, C.-F. CHAN-PIN LIN Sung, Y.-C. JEN-CHIH CHEN |
關鍵字: | Auxin; hormonal imbalance; periwinkle; phytoplasma; plant defence | 公開日期: | 2013 | 卷: | 163 | 期: | 3 | 起(迄)頁: | 420-429 | 來源出版物: | Annals of Applied Biology | 摘要: | Auxin imbalance was suggested as a key factor in phytoplasma symptom development. Furthermore, remission of the symptoms of phytoplasma-infected shoots can be promoted by culturing them in vitro in high-auxin-containing media. Therefore, effect of spraying 1-naphthaleneacetic acid (NAA) on infected periwinkle (Catharanthus roseus) with periwinkle leaf yellowing (PLY) phytoplasma was examined. 1-Naphthaleneacetic acid stimulated symptom development in phytoplasma-inoculated shoots. Accelerated symptom development was associated with early accumulation of phytoplasmas. Two PATHOGENESIS-RELATED (PR) genes, CrPR1a and CrPR1b, were induced by PLY phytoplasma infection, and the induction was suppressed by NAA. Therefore, the accelerated symptom development may be due to the suppression effect of NAA on PR-related defence. However, while NAA promoted symptom development on shoots inoculated with phytoplasma, more non-symptomatic shoots containing no phytoplasma were observed, suggesting that NAA prevents phytoplasma colonisation in non-symptomatic shoots. The expression of two genes encoding jasmonic acid (JA) biosynthesis key enzymes, lipoxygenase and allene oxide cyclase, was downregulated in non-symptomatic shoots of infected plants, and remained downregulated after auxin treatment. Therefore, the auxin-promoted resistance should be JA independent. Because auxin may promote symptom development of PLY phytoplasma-infected periwinkles, it may not link to plant resistance to phytoplasma infection. ? 2013 Association of Applied Biologists. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84885949212&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/380752 |
DOI: | 10.1111/aab.12067 | SDG/關鍵字: | acetic acid; disease incidence; enzyme activity; gene; gene expression; infectious disease; pathogenicity; phytoplasma; shoot; spray; symptom; Candidatus Phytoplasma; Catharanthus roseus |
顯示於: | 生物科技研究所 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。