Response of aromatic pathway enzymes of plant suspension cells to phosphate limitation

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Abstract

The differential expression of aromatic pathway enzymes in suspension cultures of Brassica nigra and Nicotiana silvestris in response to phosphate availablity suggests that carbon flow into the aromatic pathway and pi release is maintained in the subcellular location of the cytosol but not in plastids during phosphate limitation.

The differential expression of aromatic pathway enzymes in suspension cultures of Brassica nigra and Nicotiana silvestris in response to phosphate availability suggests that carbon flow into the aromatic pathway and Pi release is maintained in the subcellular location of the cytosol but not in plastids during phosphate limitation.

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    The shikimate pathway, in turn, may serve to produce a wide range of phenolic compounds that are often released to mobilize soil-Pi during Pi stress (Müller et al., 2015; Valentinuzzi et al., 2015; Pueyo et al., 2021). Despite the massive C cost, the initial steps that mediate the formation of secondary aromatic compounds assist in liberating Pi from Pi esters (Fischer et al., 1993; Plaxton and Carswell, 1999; Uhde-Stone et al., 2003). Thus, Pi recycling is likely among the top reasons behind the increase in secondary metabolism following Pi deprivation.

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    This is because the shikimic acid pathway is relatively expensive in terms of energy [81], as the C utilized in this pathway can reach to approximately 20% of the total C fixed by a plant under non-stressful conditions [82]. Nevertheless, it has been previously mentioned that Pi-starved plants can utilize the shikimic acid pathway for efficient recycling of esterified Pi [81,83]. In addition, the accumulated aromatic metabolites could also serve as important precursors for the synthesis of numerous secondary metabolites, such as phenolic compounds (e.g. flavonoids) and important phytohormones (e.g. auxin and salicylic acid) that contribute to Pi-stress acclimation [66].

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