Nutrição mineral de hortaliças: XXXII. distúrbios nutricionais em jiló (Solanum jilo cultivar morro grande oblongo) cultivado em solução nutritiva

Abstract

O presente trabalho teve como objetivos: - Obter um quadro sintomatologico da carência de N, P, K, Ca, Mg e B; - Composição química das folhas novas, velhas e caule em função das carências nutricionais; Plantas de jiló (Solanum jilo) cultivar Morro Grande Oblongo) foram cultivadas em vasos contendo silica e irrigadas duas vezes ao dia com solução nutritiva completa e deficientes nos nutrientes. Surgidos os sintomas as plantas foram colhidas e analisadas para os elementos em questão. Os autores descrevem os sintomas e apresentam dados analíticos referentes a plantas sadias e desnutridas.

Nutritional deficiency in scarlet eggplant limits its growth by modifying the absorption and use efficiency of macronutrients

“…When facing nutritional disturbances, plants that were deficient in K displayed visual symptoms characterized by marginal chlorosis in old leaves that evolved to necrosis, because of the accumulation of putrescine in this region. Associated with this, K deficiency was characterized by irregularities in the leaf limb of old leaves, similar to the results reported by Haag et al [ 11 ]; however, those authors did not describe chlorosis in the edges of leaves, as observed in the present study.…”

“…The symptoms of Mg deficiency were initially characterized by an appearance of an inter-nerve chlorosis in older leaves, which occurs by low concentrations of this nutrient in the foliar limb. The symptomatology described in this study are similar to the ones previously reported in scarlet eggplants [ 11 ].…”

“…Ca deficiency causes cell wall malformation, seen that this structure is maintained by Ca +2 bonds to pectates [ 30 ] that reflects in the formation of organelles such as mitochondria, which play an important role in the accumulation of ions [ 31 ]; thus, even though ions were absorbed, its incorporation in the plants metabolism was hampered. The nutritional disturbances caused by Ca deficiency evolved and reached tissue level, causing visual symptoms that start in young leaves with curved margins facing down due to cells’ malformation, similarly to the symptoms reported by Haag et al [ 11 ].…”

“…In this sense, N deficiency reduced growth and biomass production of plants by affecting several physiological mechanisms that depend on nutritional homeostasis. These events culminated in the appearance of visual symptoms in the foliar tissue, which consisted of generalized chlorosis in old leaves that over time progressed to all leaves, in a similar way as described by Haag et al [ 11 ] in scarlet eggplants.…”

“…The effects of macronutrients deficiency in scarlet eggplants were poorly investigated to date, with one limited study developed by Haag et al [ 11 ], in which the authors did not investigate nutritional interactions. Studies involving the nutritional deficiency of most species focus only in the evaluated nutrient and do not consider its interaction with other nutrients [ 7 ].…”