Global Journal of Science Frontier Research, D: Agriculture and Veterinary, Volume 22 Issue 1

samples analyzed, the concentration of chlorophyll a was higher than that of chlorophyll b , and the sum of both corresponds to the amount of total chlorophyll. Its quantity prevailed in the wild species of both plants and its range was between 520 ( P. oleracea ) and 1400 mg·100 g -1 pf ( P. ruderale ). The study on total chlorophyll in the leaves of Tunisian P. oleracea (742 mg in 100 g) carried out by Dabbou et al . (2020) reported an amount of total chlorophyll greater than that found in this study. The higher amount of bioactive compounds under wild conditions is probably due to the fact that these secondary metabolites are responsible for the plant defense system. Being subjected to conditions of greater stress, the total content of phenols in the leaves can be increased. Also, the stage of harvest has a significant effect on the total phenolic content, as well as the age of the plant(Petropoulos et al ., 2019).Chlorophyll content is one of the most significant parameters to evaluate the physiological state of plants that can be used as an index of the nutritional and stress state of the plant(Silla et al ., 2010).As bioactive compounds, chlorophylls have antioxidant and antimutagenic activity, as well as cancer prevention(Kang et al ., 2018).Its use is better when the plants are consumed fresh, since these natural pigments are thermolabile and are destroyed by heat. d) Other chemicals Determined in this study are nitrates, pH and total acidity and their content is shown in Table 3. Nitrates and pH showed significant differences (p<0.05) between growth systems, both in the species P. ruderale and in the species P. oleracea . On the contrary, total acidity did not present significant differences between plants growth systems. Table 3: Other chemicals of the aerial parts of each species: mean values ± standard error, coefficient of variability(CV) and p- value for the significance of differences between growth conditions As there is a natural nitrogen cycle in plants, it can be modified by applied agronomic practices and climatic conditions, as well as by storage conditions during post-harvest. The toxicity of nitrates increases when reduced to nitrites. However, the WHO/FAO indicates that the acceptable daily intake of nitrates expressed as ions is 3.7 mg NO 3 -· kg- 1 of body weight. Hence the importance of determining the amount of nitrates in edible plants. All these chemicals interfere with the organoleptic qualities of the species and are considered the internal quality parameters of vegetables in the agri-food industry(Cajamar, 2014). IV. C onclusions and R ecommendations The influence of growth conditions on the nutritional composition and bioactive components of two undervalued wild plants P. ruderale and P. oleracea was evaluated. The proximal analysis of the aerial parts revealed a high content of crude fiber and carbohydrates. In the mineral content, the concentration of calcium and potassium stood out with its higher level in the cultivated conditions for P. ruderale and in the wild conditions for P. oleracea . The trace element iron was relevant in both plants and in both growth conditions. Likewise, significant levels of bioactive compounds were found in the two species studied that can provide functionality when consuming these vegetables. These results suggest that undervalued wild plants can be part of diets as an alternative to commonly used vegetables, reinforcing regional practices of consumption of wild species. Simultaneously, they can be postulated as new crop sources. R eferences R éférences R eferencias 1 Year 2022 39 © 2022 Global Journals Global Journal of Science Frontier Research Volume XXII Issue ersion I VI ( D ) Note: a, b superscript indicate that a significant difference exists between the growth conditions Influence of Cultivation Conditions on the Nutritional Composition and Bioactive Components of Two Undervalued Edible Plants ( Porophyllum Ruderale and Portulaca Oleracea ) 1. AOAC: Official Methods of Analysis of Offial Analytical Chemist, 18 th ed.; Association of Official Analytical Chemist (AOAC International): Washington, DC, USA, 2005 2. BEDCA (2022). Base de datos Española de Composición de Alimentos. https://www.bedca.net /bdpub/ 3. Brand-Williams, W., Cuvelier, M.E., Berset, C. (1995).Use of free radical method to evaluate antioxidant activity. LWT-Food Sci. Technol. , 28 : 25- 30. http://dx.doi.org/10.1016/S0023-6438(95) 80008-5 4. Cajamar, G. C. (2014).Parámetros de Calidad Interna de Hortalizas y Frutas en la Industria Agroalimentaria. https://www.cajamar.es/storage /