Activación del crecimiento de Plantulas de sietecueros (Tibouchin lepidota) por Fitohormonas

Abstract

Many tropical tree species when seedling have a slow growing period that seems to be controlled by a physiological mechanism of hormonal regulation. In "sietecueros" (Tibouchina lepidota (Bnpl.) Baill), different plant hormones like polyamines, auxines, gibberellins and citokinins are involved in the regulation of this phenomena. In two, four and eight month old sietecueros seedlings, exogenous applied AlA, KIN, and AG3 , released growth, leading to more leaf and branch formation, as well as height and biomass accumulation increments. The relationship between shoot and root biomass was different among treatments. Concerning with age, the seedling response in the measured parameters was more intensive when seedlings were closer to the natural released time. Phytohormone released growth was not simultaneous in every seedling organ, conversely, depending on the physiological action, different organogenic or morphogenic processes were triggered. Thus, AG3 applied plants were the highest and produced more leaves and branches than any other treatment. AlA applied plants produced the greatest leaf areas and root systems ; KIN applications induced the greatest biomass accumulation.

Keywords

• crecimiento lento
• tibouchina lepidota
• plántula
• fitohormonas
• bosque alto-andino