Efeito da Fertilização Amoniacal na Aclimatação de Ingá Sob Alta e Moderada Irradiância
Effect of Ammonium Fertilization on Acclimation of Ingá to High and Moderate Irradiance
Santos, Ana Maria Silva dos; Ferreira, Marciel José; Gonçalves, José Francisco de Carvalho; Justino, Gilberto Costa
Resumo
O nitrogênio pode ser determinante para a tolerância das plantas a fatores de estresse como a alta irradiância. O objetivo deste trabalho foi investigar o efeito da fertilização amoniacal na aclimatação de plantas jovens de ingá sob dois ambientes de luz. O acúmulo e partição de matéria seca, o crescimento, a capacidade fotossintética e os teores foliares de nitrogênio (N) foram analisados em plantas submetidas a irradiância moderada = 554,4 ± 81 µmol de fótons m-2 s-1 e alta irradiância = 1941 ± 12,3 µmol de fótons m-2 s-1. Os maiores valores de matéria seca, crescimento e fotossíntese foram verificados em plantas sob moderada e alta irradiância fertilizadas com amônio. A área foliar específica foi maior nas plantas sob moderada irradiância, enquanto que os tratamentos controle e com a participação do N não diferiram entre si, independentemente do ambiente de luz. A fertilização amoniacal contribuiu para a aclimatação e promoveu o acúmulo de massa seca dos ingás sob moderada e alta irradiância, enquanto plantas crescendo sob moderada irradiância investiram em estratégias de interceptação de energia (e.g., área foliar específica).
Palavras-chave
Abstract
Nitrogen can be decisive for the tolerance of plants to stress factors such as high irradiance. This work aimed to investigate the effect of ammonium fertilization during acclimation of young ingá plants under two light environments. Accumulation and partitioning of dry matter, growth, photosynthetic capacity and leaf nitrogen content were analyzed in ingá plants subjected to moderate and high irradiance of 554.4±81 µmol photons m-2 s-1 and 1941±12.3 µmol photons m-2 s-1, respectively. The highest values of dry matter, growth and photosynthesis were observed in plants subjected to moderate and high irradiance fertilized with ammonium. The specific leaf area was higher in plants under moderate irradiance, while the treatments control and N fertilization showed no differences, independent of light condition. The ammonium fertilization contributed to acclimation and dry matter accumulation of ingá under moderate and high irradiance, while plants subjected to moderate irradiance invested in strategies for energy interception (e.g. specific leaf area).
Keywords
References
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