Efeito da submersão em água na germinação e da luz na emergência e desenvolvimento inicial de Inga vera Wild. (Fabaceae)

Abstract

Inga vera Willd. (Fabaceae-Mimosoidae) is a species recommended for restoration of fluvial or riparian environments in areas with permanent soaked soil. In these areas, besides flood, the light also varies along the topographic gradient, being this primary factor, not only to provide energy for photosynthesis, but also to provide signals that are related to the regulation of germination and development of the plant, by means of receptors sensitive to different intensities and spectral quality, and can trigger an extensive diversity of responses in plants. The present study aimed to evaluate the effect of different water immersion times on germination and on different levels of shading in the emergence and initial growth of Inga vera Willd. In the experiment 1, seeds were submerged by 0, 2, 4, 6, 8, 10, 20, 30 and 40 days in a stream (hypoxia) and Bequers (anoxia) and at the end of each submersion period these seeds were seeded in Germitest® paper and conditioned in germinator type BOD, with constant temperature of 25º C and photoperiod of 12h. In experiment 2, the seeds were seeded in pots and distributed in 3 light conditions: full sun (0%), 30% and 70% shade to characterize emergence and initial development at different evaluation periods (30, 60, 90 and 120 days of age). It was observed in experiment 1 that the seeds of I. vera survive in conditions of hypoxia and anoxia, but in hypoxia, germinative aspects of growth and accumulation of biomass until approximately 20 days of submersion are favored when removed from this condition, and for anoxia these evaluated aspects tend to decrease as the submersion time increases. In experiment 2, it was observed that the different light levels did not influence the emergence percentage (100%) and the survival rate (100%) of I. vera seedlings, but the seedlings in full sun took longer to emerge. Thus, it is concluded that I. vera tolerates all analyzed environmental conditions, and the seeds may germinate in areas temporarily flooded, shaded, or open (full sun) presenting quality seedlings.