Nitrogen could promote terpenoid emissions by promoting electron transport rate and leaf photosynthesis which provide ATP requirements and carbon substrate availability for isoprene synthesis. Nitrogen is expected to favor terpenoid production, especially isoprene emissions, and mono- and sesquiterpenoid emissions in non-storing species which often feature stronger and faster short-term responses to environmental factors due to the absence of terpenoid reservoirs that buffer the direct influence of the environment [2,3]. In storing species, although specific storage structures may uncouple BVOC emissions from photosynthesis, all carbon-based secondary metabolites ultimately depend on CO2 fixation and, as a result, a relationship between nitrogen and stored terpenoids can also occur. This is supported by previous work [8] that reported a direct relationship between photosynthetic carbon products like glyceraldehyde-3-phosphate or pyruvate, and terpenoids biosynthesis as well as by studies were positive relationships between leaf or soil nitrogen and terpenoid concentration in leaves has been found [9,10].

Phosphorus is expected to influence terpenoid production since terpenoid precursors (IPP: isopentenyl diphosphate and DMAPP: Dimethylallyl pyrophosphate) contain high-energy phosphate bonds and phosphorus is a key component of ATP and NADPH which are required for terpenoid synthesis. Niinemets et al. (2002) [11] estimated that Quercus coccifera L. requires 28 moles of NADPH and 40 moles of ATP to synthesize monoterpenoids. Phosphorus could hence be a key limiting nutrient involved in terpenoid emission and storage.

Isoprene emission could also be related to phosphorus availability since deprivation of this macronutrient degrades cell membranes, part of which seems to be compensated by greater isoprene emissions. In particular, phosphorus starvation reduces the amounts of phospholipids that form the bilayer in cell membranes, crucial for life in all organisms since it separates the interior of cells from their environment [12]). Siwko et al. (2007) [13] demonstrated that under heat stress, this bilayer degradation is reduced by isoprene emissions, which ensure the stability of the bilayer at a concentration of 20 mol % isoprene (16 isoprene molecules per 64 lipid molecules). The effect of this isoprene addition on the membrane is equivalent to a reduction in temperature of 10 K, rising to a reduction of 30 K at 43 mol % isoprene. Likewise, the phospholipid bilayer instability under phosphorus starvation could be copped by greater isoprene emission. Source :Current Bioactive Compounds 2012, 8, 71-79 

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Nitrogen 

phosphorus rich

But , mostly it is nitrogen where terpenoids are produced , but phosphorous plays an equally important role in activating the ATPs required for such processes.