Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 65, Issue 4, Pages 711-717Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b04118
Keywords
pepper fruit; CO2 enrichment; climate change; nitrate; ammonium; mineral composition
Funding
- Instituto Nacional de Investigaciones Agrarias (INIA) [RTA2011-00026-0O2-01]
- European Social Fund
- INIA-CCAA
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We investigated the effect of supplying nitrogen, as NO3- or as NO3-/NH4+, on the composition of fruits of sweet pepper (Capsicum annuum L. cv. Melchor) plants grown with different CO2 concentrations ([CO2]): ambient or elevated (800 mu mol mol(-1)). The results show that the application of NH4+ and high [CO2] affected the chroma related to the concentrations of chlorophylls. The concentrations of Ca, Cu, Mg, P, and Zn were significantly reduced in the fruits of plants nourished with NH4+, the loss of Fe being more dramatic at increased [CO2], which was also the case with the protein concentration. The concentration of total phenolics was increased by NH4+, being unaffected by [CO2]. Globally, the NH4+ was the main factor that affected fruit free amino acid concentrations. Polyamines were affected differently: putrescine was increased by elevated [CO2], while the response of cadaverine depended on the form of N supplied.
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