Effect of exogenous amino acids application on the biochemical, antioxidant, and nutritional value of some leafy cabbage cultivars

Abstract

Using organic fertilizer as part of plant nutrition for decreasing using chemical fertilizer and increasing plants’ nutritional value is scientists’ concern. Treatments were three concentrations of a mixture of 16 different AAs (amino acid) (0, 150 and 300 mg/L), sprayed every 7 days for 2 months on 4 leafy cabbages. Results showed 300 mg/L AAs increased anthocyanin, flavonoids, phenol, protein and proline. The SOD, POX and APX rose upon AAs usage. The application of AA significantly increased the total chlorophyll, proline, carotenoid, anthocyanin, phenol, protein and flavonoids compared to control plants. The levels of glucosinolate were increased especially in the treatment of 300 mg/L of AAs and glucobrassicin and gluconapin, both of these together represent more than 50% of the total glucosinolate contents. The highest levels of phenolic and flavonoids mostly belonged to quercetin and catechin. Total AAs and total non-essential AAs showed the highest amounts in all treatments in leaves. AAs with different concentrations by foliar application in “Ka- scotch” variety were effective in growth, physiological parameters such as plant height and shoot dry weight, while AA changes were effective in most of the biochemical and nutritional traits of “Ka-red” variety. Conclusively, the glucosinolate, phenolic and flavonoid contents and AAs varied between four cabbage cultivars. Exogenous AAs application at 300 mg/L could be recommended for cabbage cultivation to improve growth, biochemical traits, productivity and nutritional value.

Impact of biostimulants based amino acids and irrigation frequency on agro-physiological characteristics and productivity of broccoli plants

“…It has been confirmed that antioxidant enzymes play principal role in reducing free radicals; as a result, their stimulation can increase the plant's tolerance to a biotic stresses (Caverzan et al, 2016). Our findings supported the results of other studies (Haghighi et al, 2022, Ardebili et al, 2012. The hypothesis is that amino acids can enhance antioxidant enzyme capacity.…”

“…Previous researches have shown that foliar implementation of amino acids biostimulants on cabbage and Aloe vera leaves considerably upsurges antioxidant activities such as CAT, POD, SOD, and APX (El-Beltagi et al, 2010;Ardebili et al, 2012;Haghighi et al, 2020). Similarly, the activity levels of SOD, CAT, POD, and APX were increased by increasing the application of amino acids under normal and stressful conditions, particularly in cabbage plants (Haghighi et al, 2022). It has been confirmed that antioxidant enzymes play principal role in reducing free radicals; as a result, their stimulation can increase the plant's tolerance to a biotic stresses (Caverzan et al, 2016).…”

Exogenous leucine alleviates heat stress and improves saponin synthesis in Panax notoginseng by improving antioxidant capacity and maintaining metabolic homeostasis

“…In this study, metabolomics analysis showed that the contents of 11 amino acids (phenylalanine, tyrosine, alanine, glutamic acid, 5-oxoproline, glutamine, L-ornithine, proline, 4aminobutyric acid, aspartic acid, and asparagine) synthesized from four different precursors (phosphoenolpyruvate, pyruvate, 2oxoglutarate and oxaloacetate) significantly increased after leucine application (Figure 4). As previously reported, the exogenous application of some amino acids can enhance the antioxidant capacity of plants in different ways (Haghighi et al, 2022). For example, aromatic amino acids (phenylalanine, tyrosine, etc.)…”

A Systematic Review on Effects of Nitrogen Fertilizer Levels on Cabbage (Brassica oleracea var. capitata L.) Production in Ethiopia

“…The availability of nitrogen directly impacts the size and firmness of cabbage heads, with insufficient levels leading to smaller heads with loose leaves and excessive levels causing overly large but less compact heads [ 32 ]. Adequate nitrogen boosts cabbage's nutritional quality by spurring the synthesis of proteins, vitamins, and essential nutrients, enriching its overall value [ 94 ]. Optimal nitrogen levels bolster cabbage plants against pests and diseases by fostering robust growth and enhancing their ability to fend off attacks [ 95 ].…”