Differentially enhanced insect resistance, at a cost, in Arabidopsis thaliana constitutively expressing a transcription factor of defensive metabolites
Differentially enhanced insect resistance, at a cost, in Arabidopsis thaliana constitutively expressing a transcription factor of defensive metabolites
复制标题
DOI：
10.1021/jf0308049
复制
发表时间：
2004-08-11
影响因子：
6.1
通讯作者：
Dowd, PF
中科院分区：
文献类型：
--
作者：
Johnson, ET;Dowd, PF
与野生型植物相比，转MYB基因的拟南芥转基因株系显著提高了对一龄秋粘虫取食的抗性，但没有增强对甘蓝环纹夜蛾幼虫的抗性。然而，与野生型植株相比，转基因植株的花序和角果(种荚)产量分别显著减少22%和52%。果蝇摄食量的减少与存活体重的减少呈显著正相关，而与花青素的浓度呈负相关。这些结果表明，单个基因调节器可以激活足以产生更强的抗虫性的防御途径，但这种激活会导致植物生产力的下降。
A transgenic line of Arabidopsis thaliana constitutively expressing a conserved MYB transcription factor of phenylpropanoid biosynthesis resulting in solid-purple leaves had significantly increased resistance to leaf feeding by first instar fall armyworms (Spodoptera frugiperda), but no enhanced resistance to cabbage looper (Trichoplusia ni) larvae, when compared to wild type plants. However, inflorescence and silique (seed pod) production were significantly reduced by 22 and 52%, respectively, in the transgenic line compared to wild type plants. Reduction in feeding by S. frugiperda was significantly positively correlated with reduction in weights of survivors, but both were negatively correlated with the concentration of anthocyanins. These results indicate that a single gene regulator can activate a defensive pathway sufficient to produce increased resistance to insects but that this activation confers a cost in plant productivity.