GERMINATION AND EARLY DEVELOPMENT RESPONSES OF Acacia polyphylla DC TO DIFFERENT TIMES OF EXPOSURE TO WHITE AND ULTRAVIOLET LIGHT
DOI:
https://doi.org/10.63330/aurumpub.037-005Keywords:
Monjoleiro, Seeds, Photoregulation, PhytochromeAbstract
Acacia polyphylla DC (monjoleiro), a tree species native to Brazil, is recognized for its importance in reforestation projects and the restoration of degraded areas due to its adaptability and rapid growth. This study aimed to evaluate the germination and early development of Acacia polyphylla DC in response to different exposure times to UV and white light. The experimental design was completely randomized, with four treatments and 30 replicates (a total of 120 seeds). Parameters such as germination percentage and rate index (RI), shoot and root length, and shoot and root dry mass were evaluated. The results indicated that increased exposure time to UV and white light was negatively correlated with germination percentage and RI. The control group (0 minutes of exposure) had the highest germination (46.7%) and RI (1.17) values. Exposures of 10 and 20 minutes resulted in a decrease in these parameters, with the most pronounced reduction occurring after 30 minutes. Root length was optimized with up to 20 minutes of exposure, decreasing significantly after this period, suggesting that moderate exposures may be beneficial, while prolonged exposures are detrimental. Although shoot length did not show significant differences, shoot and root dry mass increased significantly with increasing exposure time. It is concluded that prolonged exposures to UV and white light negatively affect the germination of A. polyphylla, but may promote dry mass development, providing an ideal time for root growth.
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