红光：远红光条件会影响大麦（Hordeum vulgare）挥发性有机化合物的排放，从而导致邻近植物生物量分配的改变。
Red:far-red light conditions affect the emission of volatile organic compounds from barley (Hordeum vulgare), leading to altered biomass allocation in neighbouring plants.
作者信息
Kegge Wouter, Ninkovic Velemir, Glinwood Robert, Welschen Rob A M, Voesenek Laurentius A C J, Pierik Ronald
机构信息
Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands and Swedish University of Agricultural Sciences, Department of Crop Production Ecology, PO Box 7043, S-750 07 Uppsala, Sweden.
Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands and Swedish University of Agricultural Sciences, Department of Crop Production Ecology, PO Box 7043, S-750 07 Uppsala, Sweden
出版信息
Ann Bot. 2015 May;115(6):961-70. doi: 10.1093/aob/mcv036. Epub 2015 Apr 7.
BACKGROUND AND AIMS
Volatile organic compounds (VOCs) play various roles in plant-plant interactions, and constitutively produced VOCs might act as a cue to sense neighbouring plants. Previous studies have shown that VOCs emitted from the barley (Hordeum vulgare) cultivar 'Alva' cause changes in biomass allocation in plants of the cultivar 'Kara'. Other studies have shown that shading and the low red:far-red (R:FR) conditions that prevail at high plant densities can reduce the quantity and alter the composition of the VOCs emitted by Arabidopsis thaliana, but whether this affects plant-plant signalling remains unknown. This study therefore examines the effects of far-red light enrichment on VOC emissions and plant-plant signalling between 'Alva' and 'Kara'.
METHODS
The proximity of neighbouring plants was mimicked by supplemental far-red light treatment of VOC emitter plants of barley grown in growth chambers. Volatiles emitted by 'Alva' under control and far-red light-enriched conditions were analysed using gas chromatography-mass spectrometry (GC-MS). 'Kara' plants were exposed to the VOC blend emitted by the 'Alva' plants that were subjected to either of the light treatments. Dry matter partitioning, leaf area, stem and total root length were determined for 'Kara' plants exposed to 'Alva' VOCs, and also for 'Alva' plants exposed to either control or far-red-enriched light treatments.
KEY RESULTS
Total VOC emissions by 'Alva' were reduced under low R:FR conditions compared with control light conditions, although individual volatile compounds were found to be either suppressed, induced or not affected by R:FR. The altered composition of the VOC blend emitted by 'Alva' plants exposed to low R:FR was found to affect carbon allocation in receiver plants of 'Kara'.
CONCLUSIONS
The results indicate that changes in R:FR light conditions influence the emissions of VOCs in barley, and that these altered emissions affect VOC-mediated plant-plant interactions.
背景与目的
挥发性有机化合物（VOCs）在植物与植物的相互作用中发挥着多种作用，组成型产生的VOCs可能作为感知邻近植物的线索。先前的研究表明，大麦（Hordeum vulgare）品种“阿尔瓦”释放的VOCs会导致“卡拉”品种植物的生物量分配发生变化。其他研究表明，在高植株密度下普遍存在的遮荫和低红：远红（R：FR）条件会减少拟南芥释放的VOCs的数量并改变其组成，但这是否会影响植物间信号传导仍不清楚。因此，本研究考察了远红光富集对“阿尔瓦”和“卡拉”之间VOC排放及植物间信号传导的影响。
方法
通过对生长室内生长的大麦VOC排放植物进行补充远红光处理，模拟邻近植物的接近程度。使用气相色谱 - 质谱联用仪（GC - MS）分析“阿尔瓦”在对照和远红光富集条件下释放的挥发性物质。“卡拉”植株暴露于经过两种光照处理之一的“阿尔瓦”植株释放的VOC混合物中。测定暴露于“阿尔瓦”VOCs的“卡拉”植株以及暴露于对照或远红光富集光照处理的“阿尔瓦”植株的干物质分配、叶面积、茎和总根长度。
主要结果
与对照光照条件相比，在低R：FR条件下，“阿尔瓦”的总VOC排放量减少，尽管发现个别挥发性化合物受到R：FR的抑制、诱导或无影响。发现暴露于低R：FR的“阿尔瓦”植株释放的VOC混合物组成改变会影响“卡拉”受体植株的碳分配。
结论
结果表明，R：FR光照条件的变化会影响大麦中VOC的排放，并且这些改变的排放会影响VOC介导的植物间相互作用。
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