Changes in reserve mobilization caused by salinity could interfere in the initial growth of Jatropha curcas.
2021
LIRA, E. | SOUZA, J. | GALDINO, L. | MACÊDO, C. | SILVA, A. | MELO, Y. | SANTOS, I. | ARRIEL, N. H. C. | MENESES, C. | MAIA, J. | EMANNUELLA LIRA, UNIVERSIDADE ESTADUAL DA PARAÍBA; JOILMA SOUZA, UNIVERSIDADE ESTADUAL DA PARAÍBA; LUCAS GALDINO, UNIVERSIDADE ESTADUAL DA PARAÍBA; CRISTIANE MACÊDO, UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE; ANSELMO SILVA, UNIVERSIDADE ESTADUAL DA PARAÍBA; YURI MELO, UNIVERSIDADE ESTADUAL DA PARAÍBA; IVANICE SANTOS, UNIVERSIDADE ESTADUAL DA PARAÍBA; NAIR HELENA CASTRO ARRIEL, CNPA; CARLOS MENESES, UNIVERSIDADE ESTADUAL DA PARAÍBA; JOSEMIR MAIA, UNIVERSIDADE ESTADUAL DA PARAÍBA.
Salinity in soil can affect Jatropha seedling metabolism, interfering with plant establishment. In this study, the effect of salinity on the mobilization of reserves during the development of Jatropha seedlings was tested. Two genotypes of Jatropha were used and three concentrations of NaCl were applied between the 4th and 8th days after germination. The effects of salinity on seedling growth, in terms of fresh and dry phytomass, ionic partition, and sugar quantification, starch, proteins, amino acids, and lipids were evaluated in cotyledon leaves, hypocotyls, and roots. There was an increase in the content of all classes of macromolecules analyzed in at least one of the organs. It is hypothesized that the hypocotyls acted as an accumulating organ of Na+. The accumulations of amino acids and protein in roots suggest that metabolic responses occurred in response to the ionic and osmotic effects of NaCl, although this accumulation did not appear to prevent biomass losses in seedlings. Furthermore, the findings of this study demonstrate that salinity inhibits the mobilization of lipids and carbon stocks from cotyledon leaves to the rest of the plant, and together with the synthesis of proteins and amino acids that occurred primarily in roots, contributed to response of these plants to salinity.
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Este registro bibliográfico ha sido proporcionado por Empresa Brasileira de Pesquisa Agropecuária