Yield, Fructans Accumulation, and Nutritional Quality of Young Chicory Plants as Related to Genotype and Nitrogen Fertilization

Growth and quality attributes were quantified in Cichorium intybus L. and Cichorium endivia L. in response to the nitrate supply. Chicory was grown in Italy, in a cold greenhouse from the 11 of February 2020, in a pot with commercial soil and sand with and without 12 mM of Ca(NO3)(2). Seventy-six days after sowing, the growth variables, contents of leaf and root carbohydrates (glucose, fructose sucrose starch and fructans), carbon, nitrate sulphate and phosphate were measured. Fertilization significantly increased the yield and specific leaf dry weight (SLDW) of the C. endivia. The shoot/root ratio was increased in C. intybus with high N; this also increased the carbohydrate content in leaves and roots of C. endivia compared to the value measured in C. intybus. The interaction between fertilization and genotype significantly affected fructans and nitrate accumulation in taproots. Fertilization decreased the sulphate and phosphate contents in the leaves and roots of both chicory species. The yield and quality of young chicory plants can be modulated by species selection and nitrate fertilization. The genotype and nitrogen supply interact in modulating the yield and the inulin and nitrate accumulation in the taproot, thereby affecting its nutritional value and representing a powerful tool to cultivate this new produce for healthy human nutrition.