Variação ligno-anatômica em mudas de Eucalyptus grandis (Hill ex Maiden) tratadas com reguladores de crescimento

CERNE

Abreu, Heber dos Santos¹  Souza, Natália Dias de¹  Monteiro, Maria Beatriz de Oliveira¹  Pereira, Regina Paula Willemen¹ 

[1] Universidade Federal Rural do Rio de Janeiro$$

关键词: Lignin;    fiber;    gibberellin;    cytokinin.;   

DOI  :  10.1590/S0104-77602011000300011

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

The aim of this study was to analyze the influence of growth regulators GA₃ and BAP on lignification and consequently on the diameter of fibers in Eucalyptus grandis plants at age six months. Anatomical, biochemical and genetic studies after exogenous application of growth regulators during the development phase have been increasingly explored. Some of these studies have achieved progress regarding the interaction of plant hormones with the anatomy and the lignification process in plants. The application of growth regulators GA₃ and BAP was done separately or combined in the following concentrations: GA₃ (49.13 µM and 98.26 µM), BAP (111 µM and 222 µM), using seedlings of Eucalyptus grandis at age up to six months. Chemical and anatomical analyses were performed on the stem segment of plants subjected to treatment. To quantify lignin content by the Klason method, samples were subjected to removal of extractives and proteins. To measure fiber diameter, once dissociated, samples were analyzed by optical microscopy. The lignin content ranged between 23.37% and 29.64% and fiber diameter ranged between 13.33 µm and 20.39 µm. From results it was possible to visualize, with the G_[1]treatment (49.13 µM of GA₃ with 111µM of BAP) that lignin content dropped ^C[1] by 21.2% in relation to the control treatment, and that fiber diameter had the smallest increase in relation to other treatments.

【 授权许可】

Unknown