Abstract
ABSTRACT: Desert rose (Adenium obesum) is a succulent plant that is native to the Arabian Peninsula. It has great commercial value with exuberant structure and flowering. It can be propagated by seeds to ensure maximum development of the caudex. Despite its high economic value, studies on its propagation are still required. The aim of this study was to evaluate seed germination performance and seedling development of desert rose seedlings in different substrates. Treatments comprised five different substrate compositions: S1 (Soil), S2 (Sand), S3 (Carolina Soil commercial substrate), S4 (Sand + Carolina Soil), and S5 (Soil+ Carolina Soil). The following were evaluated using uni- and multi-variate approaches: germination, first count, germination speed index, caudex diameter, number of leaves, seedling length, root length, shoot length, and fresh mass and dry mass. Sand is the ideal substrate for the germination of A. obesum seeds, while for forming seedlings, mixtures of the Carolina Soil commercial substrate with sand or soil should be used.
Highlights
The desert rose (Adenium obesum (Forssk.), Roem. & Schult), belonging to the family Apocynaceae, is native to tropical Africa and Arabia but has been introduced and naturalized in different parts of the world (TALUKDAR, 2012; HOSSAIN, 2018)
In relation to physiological performance, the seeds of A. obesum were evaluated for germination (G), which was conducted with four replications of 25 seeds in styrofoam trays with cells filled with substrates, moistened with an amount of water equivalent to 60% of its retention capacity, and one seed per cell sown to a depth of 0.5 cm
According to the analysis of variance (ANOVA), there was a significant effect for treatments for germination (G), first germination count (FC), and germination speed index (GSI) (p
Summary
The desert rose (Adenium obesum (Forssk.), Roem. & Schult), belonging to the family Apocynaceae, is native to tropical Africa and Arabia but has been introduced and naturalized in different parts of the world (TALUKDAR, 2012; HOSSAIN, 2018). & Schult), belonging to the family Apocynaceae, is native to tropical Africa and Arabia but has been introduced and naturalized in different parts of the world (TALUKDAR, 2012; HOSSAIN, 2018). Because of its high demand and the destruction of its natural habitat in certain tropical African countries, the desert rose is an endangered plant (TALUKDAR, 2012). The slow-growing desert rose can be propagated by seeds and cuttings (ROMAHN, 2012). The plant has a thickened stem at the base called the Approved 07.16.20 Returned CR-2019-0691.R1 by the author. Florists report that the thickening of the stem base can be shaped and attain higher market value; this characteristic is not manifested when the plant is vegetative propagated (STEGANI et al, 2019)
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