Mandevilla sanderi (Hemsl.) Woodson (Woodson, 1933) is a plant native to Brazil, increasingly used in horticulture for its ornamental aspect, abundant and extended flowering, persistent and glossy foliage, tolerance to limited water availability, and resistance to many plant pests. The genus Mandevilla belongs to the family Apocynaceae, subfamily Apocynoideae, tribe Mesechiteae, and includes more than 170 species, most of which are native to the tropical forests of South and Central America (Morales, 1998, 2005; Simöes et al., 2007). Mandevilla sanderi is characterized by its woody, volubile stems, persistent foliage with decussate phyllotaxy, axillary racemose-type inflorescences, and pink, infundibuliform corollas. Whereas several species of Mandevilla have been extensively studied for their pharmacological properties (Biondo et al., 2004), the physiological characteristics of this species have not yet received adequate attention.
This plant is vegetatively propagated by taking cuttings from mother plants. This operation involves the removal of leafy branches, depriving the plant of part of its biomass and, as a result, its glucidic compounds. For Platanus acerifolia, this loss of biomass has an impact on the plant's ability to continue its growth (Haddad et al., 1995). Its subsequent development thus requires the mobilization of reserves present in its different organs. The lack of knowledge about the physiology of this species therefore makes it necessary to characterize at the level of their anatomic organization as well as at the level of their ability to store starch.
The purpose of this study was to localize and to quantify starch reserves in the various plant organs. To do this, we adopted an approach that consisted, first, of carrying out anatomical characterization of these organs and then localizing the starch using histochemical analysis. Finally, biochemical analyses allowed us to quantify these reserves. To know this quantity and the localization of these reserves in the plant tissue allows to assess the ability of the plant to remobilize these resources after pruning, particularly in the case of mother plant management (Latt et al., 2000), and to ensure good rooting of cuttings (Eliasson, 1978).
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Zerche, S. & Druege, U. 2009 Nitrogen content determines adventitious rooting in Euphorbia pulcherrima under adequate light independently of pre-rooting carbohydrate depletion of cuttings Sci. Hort. 121 340 347