Índice de clorofila em plantas de arroz de terras altas submetidas a estresse por alumínio e aplicação de silício

• Autor(a) principal: Freitas, Lucas Barbosa de [UNESP]
• Data de Publicação: 2013
• Outros Autores: Fernandes, Dirceu Maximino [UNESP], Maia, Suelen Cristina Mendonça [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.dca.uem.br/V2N2.htm; http://hdl.handle.net/11449/137618
• topic: Leaf angle; SPAD; Magnesium; Ângulo foliar; SPAD; Magnésio

Si application on plants has promoted beyond best light incidence, greater CO2 absorption and decrease excessive transpiration, allowing rate of photosynthesis increasing rate and leaf chlorophyll content, especially in stress situations for plant. Thus, aimed to evaluate SPAD index and leaf angle in upland rice plants under Al3+ stress and Si application. Were conducted three experiments (I – nutrient solution; II – sandy soil; III – clayey soil). The experimental design utilized on all of the three experiments, was randomized block design, in 2x5 factorial arrangement, with four replications. Treatments were two cultivars of upland rice, BRS Talent - not tolerant and Guarani - tolerant to Al+3 and five Si rates (0. 30. 60. 90 and 120 mg dm-3). The variables evaluated were, leaf angle in 3 points (Experiment I) and SPAD index (Experiments I, II and III). The Si does not contribute to the increase in the SPAD index of plants under Al3+ stress. The Si application promotes less angle leaf plants, making them more standing in plants under Al3+ stress.