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园艺学报 ›› 2016, Vol. 43 ›› Issue (7): 1286-1294.doi: 10.16420/j.issn.0513-353x.2016-0080

• 蔬菜 • 上一篇    下一篇

番茄木虱取食对含Mi-1.2番茄抗氧化酶活性及防御反应相关基因表达的影响

嘎奥云朝伦*,牛一丁*,包文化,哈斯阿古拉,哈 达**   

  1. (内蒙古大学生命科学学院,呼和浩特 010021)
  • 出版日期:2016-07-25 发布日期:2016-07-25

Effects of Tomato Psyllid Infestation on Activity of Anti-oxidant Enzymes and Expression Levels of Defense Response Related Genes in the Tomato Carrying Resistance Gene Mi-1.2

GANBAATAR Oyunchuluun*,NIU Yi-ding*,BAO Wen-hua,HASI Agula,and HA Da**   

  1. (College of Life Science,Inner Mongolia University,Hohhot 010021,China)
  • Online:2016-07-25 Published:2016-07-25

摘要:

Mi-1.2基因编码CC-NBS-LRR家族抗病蛋白,对线虫及刺吸式昆虫具有广谱抗性。以番茄木虱和携带Mi-1.2基因的番茄品系Motelle’作为研究体系,研究番茄木虱取食对番茄叶片抗氧化酶活性及防御反应相关基因表达的影响。结果表明:番茄木虱的取食显著提高了番茄叶片抗氧化酶POD、CAT、APX等的活性,同时诱导Mi-1.2基因表达;番茄木虱的取食上调SA合成有关基因PAL、SA信号途径标志基因PR-1P4)及与Mi-1.2功能相关基因WRKY70、WRKY72a、WRKY72b的表达。JA/systemin信号途径和伤害有关的PinIITPI-1PR-6PR-7PR-5等及Prosystemin编码基因Psy的表达未发生变化;JA合成途径相关酶编码基因AOS2LoxD下调表达,AOC的表达没有变化。SA信号途径可能参与Mi-1.2介导的番茄对于刺吸式昆虫番茄木虱的防御反应。另外,Mi-1.2的RNAi沉默不会改变上述基因的mRNA水平,说明Mi-1.2基因产物对这些基因的表达无调控作用。

关键词: 番茄, Mi-1.2, 木虱, 抗氧化酶, 防御反应, SA信号途径

Abstract:

Mi-1.2 is a CC-NBS-LRR protein encoding gene in tomato that confers broad-spectrum resistance toward nematode and piercing-sucking insects such as aphid,whitefly and psyllid. In this study,we investigated the mechanism of Mi-1.2 resistance toward tomato psyllid by measuring the activity of anti-oxidant enzymes and transcript levels of defense response related genes in resistant tomato cultivar‘Motelle’challenged with tomato psyllid infestation. Feeding of tomato psyllid elevated the activity of protective enzymes POD,CAT and APX,and also induced the expression of the gene coding for PAL,a key enzyme in SA synthesis,SA signaling marker gene PR-1 and also three WRKY family genes required for Mi-1.2 mediated defense response. Mi-1.2 itself is also upregulated by tomato psyllid feeding.  

Expression level of JA/systemin signaling pathway related genes such as PinIITPI-1PR-6PR-7PR-5 and prosystemin encoding gene Psy did not change,while the expression of JA synthesis related genes AOS2 and LoxD was repressed by tomato psyllid infestation. The results indicated that SA signaling pathway is involved in Mi-1.2 mediated tomato resistance against piercing-sucking insect tomato psyllid. Expression of those genes mentioned above was not altered by RNAi knockdown of Mi-1.2,suggesting that Mi-1.2 has no regulatory role on the expression of these genes.

Key words: tomato, Mi-1.2, tomato psyllid, anti-oxidant enzyme, defense response, SA signaling pathway

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