Abstract
The present study aimed to evaluate the initial growth and leaflet and xylopod anatomical responses in seedlings when subjected to different hydraulic regimes. Seedlings after 150 days of germination were used, evaluating three hydraulic regimes after transplantation: T0= daily watering (control); T1= watering every three days and T2= watering every five days. After 90 days, growth parameters and qualitative and quantitative characterization of seedling leaflets and xylopods were evaluated. There were statistical differences only for xylopod diameter and main root length, where the highest average for xylopod diameter was verified with daily watering hydraulic regime (control treatment), 15.37 cm-1. While for main root length, the highest average, 33,8 cm-1, was verified with watering every five days. With higher biomass allocation percentage, the xylopod was the main drain, regardless of the hydraulic regime adopted. Higher averages for density, polar and equatorial diameter of the stomata were observed in seedling leaflets subjected to the hydraulic regime with watering every 5 days. It was observed that only palisade and sponge parenchymas presented difference, where the hydraulic regime with watering every three and five days presented higher density, respectively.
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