Elevated carbon dioxide increases nectar production in Epilobium angustifolium L.
Elevated carbon dioxide increases nectar production in Epilobium angustifolium L.
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DOI：
10.1007/s00442-005-0182-5
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发表时间：
2005-12-01
期刊：
影响因子：
2.7
通讯作者：
Stöcklin, J
中科院分区：
文献类型：
--
作者：
Erhardt, A;Rusterholz, HP;Stöcklin, J
在温室试验条件下，研究了CO2浓度升高和养分有效性对5个不同种子科（基因型）棉花花蜜产量和开花时间的影响。二氧化碳浓度升高显著提高了日均花蜜产量（+51%,p < 0.01）、单花总糖含量（+41%,p < 0.05）、氨基酸浓度（+65%,p < 0.05）和单花总氨基酸含量（+ 192%,p < 0.001）。所有其他测试参数，即花蜜糖浓度、葡萄糖/果糖比例和蔗糖/（葡萄糖+果糖）比例，均未受CO2升高和/或施肥的显著影响。然而，在高施肥的植物中，二氧化碳浓度升高导致了较早开花的轻微显著趋势。在所有测试参数中均未发现显著的家族与CO2交互作用，但对花蜜产量的响应在种子科之间差异很大（+ 10%至+ 104%），并且在5个调查的种子科中有2个显着为正。我们的结果与早期关于二氧化碳升高对其他植物花蜜生产和开花物候的影响的研究不一致。另一方面，二氧化碳对花蜜产量的影响似乎是特定于物种和基因型的。因此，目前还不能得出二氧化碳浓度升高对这些花性状影响的一般性结论。但必须注意的是，升高的二氧化碳可能不仅会增加花的奖励，如e.a angustifoliian…但也可能导致调整好的植物与传粉者的相互作用发生变化甚至中断。
Effects of elevated CO2 and nutrient availability on nectar production and onset of flowering in five different seed families (genotypes) of Epilobium angustifolium were investigated in a greenhouse experiment. Elevated CO2 significantly increased nectar production per day (+51%, p < 0.01), total sugar per flower (+41%,p < 0.05), amino acid concentration (+65%,p < 0.05) and total amino acids per flower(+ 192%,p < 0.001). All other parameters tested, i.e., nectar sugar concentration, proportion of glucose/fructose and proportion of sucrose/(glucose + fructose), were not significantly affected by elevated CO2 and/or fertilization. However, elevated CO2 caused a marginally significant trend for earlier flowering in highly fertilized plants. No significant family x CO2 interaction was found in any of the tested parameters, but the response in nectar production varied considerably among seed families (+ 10 to + 104%) and was significantly positive in two of the five seed families investigated. Our results are not consistent with earlier studies on effects of elevated CO2 on nectar production and flowering phenology in other plant species. It seems, on the other hand, that CO2 effects on nectar production are specific to species and genotype. Hence, no general conclusions about effects of elevated CO2 on these floral traits can be drawn at present. but it must be cautioned that elevated CO2 might not only increase floral rewards as in E. angustifoliian.. but might also lead to shifts or even disruptions in fine-tuned plant-pollinator interactions.