NASCIMENTO, C. W. A. DO; MARQUES, M. C. <b>Metabolic alterations and X-ray chlorophyll fluorescence for the early detection of lead stress in castor bean (<i>Ricinus communis</i&gt;) plants. Acta Scientiarum. Agronomy, v. 40, n. 1, p. e39392, 1 ago. 2018.