Spatial differences in (Z)-3-hexen-1-ol production preferentially reduces Spodoptera litura larva attack on the young leaves of Nicotiana benthamiana.
Spatial differences in (Z)-3-hexen-1-ol production preferentially reduces Spodoptera litura larva attack on the young leaves of Nicotiana benthamiana.
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DOI：
10.1016/j.plantsci.2016.08.016
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
Yuqian Zhang;Xiumin Fu;Feiyan Wang;Ziyin Yang
中科院分区：
文献类型：
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作者：
Yuqian Zhang;Xiumin Fu;Feiyan Wang;Ziyin Yang
植物合成专门的代谢物，具有极其重要的生态功能，包括直接防御、间接防御和信号传导。最佳防御理论（ODT）提出，防御性代谢物优先分配到适应值高的组织或容易受伤的部位。在我们目前的研究中，使用模型植物本塞姆氏烟草，我们发现对N的直接防御。本塞姆氏菌针对斜纹夜蛾（Fabricius）幼虫在产生防御性化学物质的位点上表现出空间差异。上部叶的直接防御能力明显强于中下部叶。有趣的是，上部叶的强大防御能力并不是由于众所周知的防御代谢物如尼古丁和绿原酸的出现而产生的。受害后中、下部叶比上部叶释放出更多的(Z)-3-己烯-1-醇，既能吸引幼虫，又显着增加中、下部叶被幼虫吃食的量。 (Z)-3-己烯-1-醇发射的空间差异可能是由于脂氧合酶(NbLOX2)表达的空间差异，脂氧合酶负责(Z)-3-己烯-1-醇的形成和发射。这项研究为ODT提供了新的见解，表明植物通过降低组织中草食动物摄食刺激物的浓度来有效保护容易受伤的组织。
Plants synthesize specialized metabolites which possess extremely important ecological functions including direct defense, indirect defense, and signaling. The optimal defense theory (ODT) proposes that defensive metabolites are preferentially allocated to the tissues with high fitness value or in locations that are easily injured. In our present study, using the model plantNicotiana benthamiana, we found that direct defense ofN. benthamianaagainstSpodoptera litura(Fabricius) larvae showed spatial differences in the sites producing defensive chemicals. The upper leaves possessed significantly stronger direct defense ability than the middle and lower leaves. Interestingly, the strong defense ability of the upper leaves was not due to occurrences of well-known defensive metabolites such as nicotine and chlorogenic acid. After damage, the middle and lower leaves emitted higher amounts of (Z)-3-hexen-1-ol than the upper leaves, which could both attract larvae and significantly increase the amount of middle and lower leaf eaten by the larvae. The spatial difference in (Z)-3-hexen-1-ol emission may be due to spatial differences in expression oflipoxygenase(NbLOX2), which is responsible for the formation and emission of (Z)-3-hexen-1-ol. This study provided new insight into ODT, showing that plants effectively protect easily injured tissues through reduction in concentration of herbivore-feeding stimulant in the tissues.