MORPHOLOGICAL MODIFICATIONS IN Eucalyptus grandis WITH APPLICATION OF BIOREGULATORS AT JUVENILE STAGE
DOI:
https://doi.org/10.24278/2178-5031.2012242394Keywords:
forest improvement, physiology, growth regulationAbstract
This aim of this study was the application of plant bioregulators: paclobutrazol, giberelic acid, and ethefon in Eucalyptus grandis seedlings. Morphologic evaluations were done, as plant height (cm) and stem diameter (mm) and indirect measurement of chlorophyll index. The statistical design was in randomized blocks, through split-plot schedule, with three replications. The paclobutrazol (PBZ) have promoted leaf morphological variations as: accentuation of central nervures, reduction in size, modification in color and coriaceous leaves. We also verified reduction in internode lengths; overcoming seed dormancy, and development of lateral branches, reduction of plant height (68%), increasing of chlorophyll amount (29%). Giberelic acid (GA3) have shown to be important chemical related to vegetative development, stimulating plant height growth (41%), showing an inapropriate chemical to promote the maturation in plant tissue. Ethephon did not cause any sgnificant change in Eucalyptus grandis.
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