Histological features, starch accumulation and sprouting in the early root development of Jacaranda ulei (Bignoniaceae)

Abstract

The plant species occurring in the savanna region of the Cerrado biome in Brazil present typical morphological and physiological adaptations to a dry climate with seasonal occurrence of wildfires. In this study, the histological features of the root system, the main sites of synthesis and storage of starch and the initial phases of the bud development were characterized in Jacaranda ulei. The anatomical features observed in the root system of J. ulei are related to the needs of the species to survive in the Cerrado. The histochemical analyses demonstrated high synthesis of glucose and glycoprotein after the third day of in vitro culture, in the proximal cells of the cortical parenchyma of the exoderm. Meristematic primordia were observed in the ninth day and the beginning of the meristem formation was observed after 21 days of in vitro culture. Jacaranda ulei displays morphological, anatomical and storage features typical from resprouter species. However, it may be vulnerable to unsustainable exploitation. Considering the importance of this species for local people, more studies regarding its therapeutic properties should be performed, including the planning of appropriate programs for the species management and the production of selected clones through in vitro micropropagation.

CYTOKININ AND FLASK SEALING AFFECT SHOOT PROLIFERATION AND In Vitro DEVELOPMENT OF Jacaranda cuspidifolia MART. MICROCUTTINGS

“…However, the variability in germination percentage (Parreira et al, 2011), the diffi culty in acquiring large quatities of seeds (Debnath, 2004) and the long period of vegetative development (Gantait et al, 2011) have led to the search for alternatives propagation ways. In this context, vegetative propagation methods such as minicutting (Fauerharmel et al, 2020) and micropropagation systems (Malosso et al, 2012;Silva and Stefenon, 2014;Silveira et al, 2018) have been established for some Jacaranda spp due to their ornamental potential and phytochemical and ethnopharmacological relevance, contributing to their conservation and domestication (Silveira et al, 2013).…”

Morphoanatomic Study of Jacaranda ulei and Variability of Its Volatile Oils

“…) verified the in vitro antioxidant activity of the ethanolic extracts of leaves and roots. Silva and Stefenon (2014) described the histological features of the root system and demonstrated high synthesis of glucose and glycoprotein after the third day of in vitro culture in the proximal cells of the cortical parenchyma of the exoderm.…”