Drought and soil amendment effects on monoterpene emission in rosemary plants.
The aim of this work was to study the changes during 15days in the monoterpene emission rates of the Mediterranean shrub rosemary (Rosmarinus officinalis L.), in response to increasing drought stress and fertilisation using two different composts derived from livestock anaerobic digestates (cattle and pig slurry). Drought stress considerably reduced photosynthetic rates, stomatal conductance and isoprenoid emissions and also induced a change in blend composition. In the drought stressed rosemary plants, a positive relationship of non-oxygenated monoterpene emissions and a negative relationship of oxygenated monoterpene with photosynthesis were observed, indicating a different control mechanism over the emissions of the two types of isoprenoids. The emission of non-oxygenated monoterpenes seemed to depend more on photosynthesis and "de novo" synthesis, whereas emission of oxygenate monoterpenes was more dependent on volatilisation from storage, mainly driven by cumulative temperatures. In the short term, the addition of composted organic materials to the soil did not induce a significant effect on isoprenoid emission rates in the rosemary plants. However, the effect of the interaction between fertilisation and seasonality on isoprenoid emission rates was influenced by the amendment origin. Also, we emphasized changes in potential isoprenoid emission factors throughout the experiment, probably indicating changes in the leaf developmental stage.
Institute of Agro-Environmental and Forest Biology, National Research Council of Italy, Via Salaria km 29,300, 00015 Monterotondo Scalo, Rome, Italy. Electronic address: isabel.nogues@ibaf.cnr.it.
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Nogués
Institute of Agro-Environmental and Forest Biology, National Research Council of Italy, Via Salaria km 29,300, 00015 Monterotondo Scalo, Rome, Italy.
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Muzzini
National Research Council, Department of Biology, Agriculture and Food Sciences (DISBA-CNR), Piazzale Aldo Moro 7, 00185 Rome, Italy.
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Loreto
Department of Agrochemistry and Environment, Miguel Hernandez University, EPS-Orihuela, ctra. Beniel km 3.2, 03312 Orihuela, Spain.
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Bustamante
D055864:Droughts; D004784:Environmental Monitoring; D008372:Manure; D039821:Monoterpenes / Q000032:analysis*; D027542:Rosmarinus / Q000502:physiology*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
D008372:Manure; D039821:Monoterpenes; D012987:Soil; D012989:Soil Pollutants
Abiotic stress; Anaerobic digestate derived-compost; Biogenic volatile organic compounds; Organic amendments; Rosmarinus officinalis L.