Impact of flooding and drought conditions on the emission of volatile organic compounds of Quercus robur and Prunus serotina
Impact of flooding and drought conditions on the emission of volatile organic compounds of Quercus robur and Prunus serotina
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DOI：
10.1007/s00468-013-0942-5
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发表时间：
2014-02-01
影响因子：
2.3
通讯作者：
Bonn, Boris
中科院分区：
文献类型：
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作者：
Bourtsoukidis, E.;Kawaletz, H.;Bonn, Boris
我们用栎树(Quercus robur L.)和黑樱桃(Prunus serotina Ehrh.)研究苗木在干旱和洪涝条件下的挥发性有机化合物(VOC)排放行为。一种新的试管封闭方法被应用于18个个体，并使用质子转移反应-质谱仪(PTR-MS)和气相色谱-质谱仪(GC-MS)技术计算了发射率。对所有样品进行了互补叶绿素荧光和二氧化碳吸收测量。问：Robur的幼苗没有受到洪水的影响。相反，白杨幼苗的叶绿素荧光产量下降了34.5+/-A 4.1%，CO2吸收下降了67.5+/-A 10.5%。这些观察结果以及记录的最高乙醛排放量表明，对水分胁迫的敏感性很强。干旱对两种植物都有相似的影响，降低了叶绿素荧光产量、二氧化碳吸收和大多数VOC的排放速率。然而，在所有处理下，刺杉幼苗释放的异戊二烯都是对照的20多倍。总体而言，大多数VOC排放量随着土壤水分有效性的增加而增加，表现为乙醛和甲醇呈指数趋势，而单萜和倍半萜之和呈线性趋势。与潮湿条件相比，干旱条件下橡树只释放出约两倍的水杨酸甲酯。考虑到它们的挥发性有机碳排放行为，罗布麻幼苗对洪水的耐受性似乎比血清型青杨要好得多，因此在这些条件下很可能具有竞争优势。
We conducted measurements with oak (Quercus robur L.) and black cherry (Prunus serotina Ehrh.) seedlings to investigate their volatile organic compound (VOC) emission behavior to flooding and drought conditions. A novel cuvette enclosure approach was applied on 18 individuals and emission rates were derived using proton transfer reaction-mass spectrometry (PTR-MS) and gas chromatography-mass spectrometry (GC-MS) techniques. Complementary chlorophyll fluorescence and CO2 uptake measurements were performed for all of the samples. Q. robur seedlings remained unaffected by flood. On the contrary, P. serotina seedlings reduced their chlorophyll fluorescence yield by 34.5 +/- A 4.1 % and their CO2 uptake by 67.5 +/- A 10.5 %. These observations along with the highest acetaldehyde emissions recorded indicate strong susceptibility to water stress. Drought had a similar impact on both species that reduced chlorophyll fluorescence yield, CO2 uptake, and the emission rates of most VOC. Nevertheless, isoprene was found to be emitted more than 20 times stronger by Q. robur seedlings under all treatments. In general, most VOC emissions increased with soil water availability displaying an exponential trend for acetaldehyde and methanol and a linear one for the sum of mono- and sesquiterpenes. Only methyl salicylate was released about two times stronger from oaks under drought conditions in comparison to wet conditions. Considering their VOC emission behavior, Q. robur seedlings appear to tolerate flood much better than P. serotina and thus it is likely to have a competing advantage under these conditions.