| Texto completo | |
| Autor(es): |
Santos, Elcio Ferreira
;
Macedo, Fernando Giovannetti
;
Zanchim, Bruno Jose
;
Pereira Lima, Giuseppina Pace
;
Lavres, Jose
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Plant Physiology and Biochemistry; v. 115, p. 249-258, JUN 2017. |
| Citações Web of Science: | 3 |
| Resumo | |
The description of physiological disorders in physic nut plants deficient in nitrogen (N), phosphorus (P) and potassium (K) may help to predict nutritional imbalances before the appearance of visual symptoms and to guide strategies for early nutrient supply. The aim of this study was to evaluate the growth of physic nuts (Jatropha curcas L) during initial development by analyzing the gas exchange parameters, nutrient uptake and use efficiency, as well as the nitrate reductase and acid phosphatase activities and polyamine content. Plants were grown in a complete nutrient solution and solutions from which N, P or. K was omitted. The nitrate reductase activity, phosphatase acid activity, polyamine content and gas exchange parameters from leaves of N, P and K-deficient plants indicates earlier imbalances before the appearance of visual symptoms. Nutrient deficiencies resulted in reduced plant growth, although P- and IC deficient plants retained normal net photosynthesis (A), stomatal conductance (gs) and instantaneous carboxylation efficiency (k) during the first evaluation periods, as modulated by the P and K use efficiencies. Increased phosphatase acid activity in P-deficient plants may also contribute to the P use efficiency and to A and gs during the first evaluations. Early physiological and biochemical evaluations of N, P- and K-starved plants may rely on reliable, useful methods to predict early nutritional imbalances. (C) 2017 Elsevier Masson SAS. All rights reserved. (AU) | |
| Processo FAPESP: | 11/15208-0 - Testes bioquímicos e fisiológicos em pinhão-manso para previsão de desordens nutricionais de macronutrientes |
| Beneficiário: | Elcio Ferreira dos Santos |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |