Dispensing a Synthetic Green Leaf Volatile to Two Plant Species in a Common Garden Differentially Alters Physiological Responses and Herbivory
Dispensing a Synthetic Green Leaf Volatile to Two Plant Species in a Common Garden Differentially Alters Physiological Responses and Herbivory
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DOI：
10.3390/agronomy11050958
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发表时间：
2021-05-01
期刊：
影响因子：
3.7
通讯作者：
Frost, Christopher J.
中科院分区：
文献类型：
--
作者：
Freundlich, Grace E.;Shields, Maria;Frost, Christopher J.
草食诱导植物挥发性物质（HIPV）介导的植物窃听是一种有充分证据的可诱导现象，在加强植物防御和病虫害管理方面具有实际的农艺应用。然而，与任何可诱导现象一样，对挥发性线索的响应可能会产生生理和生态成本，从而限制植物的生产力。在一个普通的花园实验中，我们测试了一个假设，即暴露于单一的HIPV会以减少植物生长和繁殖为代价来减少食草动物的伤害。青豆（Phaseolus lunatus）和辣椒（Capsicum annuum）植物暴露于持续低剂量（约10 ng/h）的绿叶挥发物顺式-3-己烯乙酸酯（z3HAC），这是一种HIPV和损害相关的挥发物。与对照相比，z3hac处理的辣椒植株更矮，地上和地下生物量更少，开花和果实也更少，而z3hac处理的利马豆植株更高，叶片和花朵也更多。暴露于z3hac的青豆植物的天然食草性减少，但辣椒没有。在暴露于z3HAC的青豆幼叶中，被认为是直接防御机制的产氰潜力较低，这表明仅暴露于z3HAC存在生长-防御权衡。植物对相同挥发性线索的物种特异性反应对田间条件下挥发物介导的植物间交流的农艺成本和效益具有重要意义。
Herbivore-induced plant volatile (HIPV)-mediated eavesdropping by plants is a well-documented, inducible phenomenon that has practical agronomic applications for enhancing plant defense and pest management. However, as with any inducible phenomenon, responding to volatile cues may incur physiological and ecological costs that limit plant productivity. In a common garden experiment, we tested the hypothesis that exposure to a single HIPV would decrease herbivore damage at the cost of reduced plant growth and reproduction. Lima bean (Phaseolus lunatus) and pepper (Capsicum annuum) plants were exposed to a persistent, low dose (similar to 10 ng/h) of the green leaf volatile cis-3-hexenyl acetate (z3HAC), which is a HIPV and damage-associated volatile. z3HAC-treated pepper plants were shorter, had less aboveground and belowground biomass, and produced fewer flowers and fruits relative to controls, while z3HAC-treated lima bean plants were taller and produced more leaves and flowers than did controls. Natural herbivory was reduced in z3HAC-exposed lima bean plants, but not in pepper. Cyanogenic potential, a putative direct defense mechanism in lima bean, was lower in young z3HAC-exposed leaves, suggesting a growth-defense tradeoff from z3HAC exposure alone. Plant species-specific responses to an identical volatile cue have important implications for agronomic costs and benefits of volatile-mediated interplant communication under field conditions.