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Bioactive Compounds and Initial Growth Parameters of Jacaranda mimosifolia Under Shading Levels and Substrate Compositions in Tropical Conditions

Year: 2025

Type: article

Abstract: Background This study aimed to evaluate bioactive compounds and initial growth parameters of Jacaranda mimosifolia seedlings under shading levels and substrate compositions. Methods A completely randomized design arranged in a 3 × 5 factorial scheme (3 shading × 5 substrates) was used. The shading levels were 0%, 30%, and 50%. The substrates were compost made up of organomineral material (M) and vermiculite (V): 100/0 M:V, 80/20 M:V, 60/40 M:V, 40/60 M:V, and 20/80 M:V. Results Producing J. mimosifolia seedlings under the full sun is not recommended in tropical conditions. The 30% and 50% shade screens reduced photosynthetically active radiation by 38% and 62%, respectively. In the 50% shading environment, the average number of leaves increased by 68%, the stem diameter by 60%, the shoot dry matter by 250%, the root dry matter by 113%, the total dry matter by 184%, and the quality of the J. mimosifolia seedlings by 127%. The cultivation in the 50% shading environment, on average, increased the chlorophyll a content by 77%, the chlorophyll b content by 56%, the total chlorophyll content by 70%, and the carotenoid content of the J. mimosifolia seedlings by 45%. A substrate containing 20%M for J. mimosifolia seedlings is not recommended. The best J. mimosifolia seedlings are produced in the 50% shading environment and the 100%M substrate, resulting in better biometric quality and higher chlorophyll and carotenoid contents in addition to promoting an improvement in the survival rate and acceleration in initial growth.

Source: Arboriculture & Urban Forestry

DOI: 10.48044/jauf.2025.026