Secondary root growth in Rhynchosia edulis Griseb. (Leguminosae): Origin of cambia and their products

Comparative root anatomy of papilionoid Legumes

“…In the species belonging to the tribes Aeschynomeneae, Vicieae, and Trifolieae, the cambium results from a procambial remnant located between the xylem and the phloem. This origin is different from that of the species belonging to the tribe Phaseoleae, in which apart from the regular cambium, other accessory cambia are formed as a result of a dedifferentiation process that occurs in phloematic parenchyma cells, as it is the case in Rhynchosia edulis and Rhynchosia prostrata (Basconsuelo, 2001(Basconsuelo, , 2004Kraus and Basconsuelo, 2009), or in the xylem, as found in Pachyrhizus ahipa (Milanez and MoraesDallaqua, 2003). In the tribe Mirbelieae, roots of the majority of Daviesia species show an anomalous secondary growth as a result of a differentiation process of concentric layers of interconnected vascular strands.…”

“…Variability in root anatomy results mainly from the different origins of the cambium and its different products (Carlquist, 2001;Islam et al, 2007;Kraus and Basconsuelo, 2009;Kraus et al, 2003;Kraus et al, 2007;Metcalfe and Chalk, 1983;Rajput et al, 2006;Rajput, 2003). In the species belonging to the tribes Aeschynomeneae, Vicieae, and Trifolieae, the cambium results from a procambial remnant located between the xylem and the phloem.…”

“…Previous studies on legumes have demonstrated not only the diversity in the origin of the cambium (Carlquist, 2001;Metcalfe and Chalk, 1983) but also the occurrence of different cambial types, ranging from normal to more complex ones (Basconsuelo, 2004;Islam et al, 2007;Kraus and Basconsuelo, 2009;Kraus et al, 2003;Kraus et al, 2007;Kutschera and Lichtenegger, 1992;Lachaud et al, 1999;Milanez and Moraes-Dallaqua, 2003;Pate et al, 1989;Rajput et al, 2006;Rajput, 2003). In general, the majority of studies on legumes relate root anatomy to the environment rather than to systematics.…”

Prenylated Isoflavonoids from Rhynchosia edulis

“…The 1 H NMR spectrum exhibited a signal at δ H 13.46 indicative of a downfield shifted C-5 hydroxy group. The presence of the C-8 proton at δ H 6.34 as well as a 3′′,3′′-dimethyl-1′′,2′′-dehydropyran substitution at C-6 and C-7 of its A-ring were also evident in its1 H NMR spectrum. Its B-ring is characterized by the presence of three aromatic signals [δ H 7.36 (1H, d, J = 2.21 Hz), 6.88 (1H, d, J = 8.26 Hz), and 7.27 (1H, dd, J = 2.26 and 8.26 Hz)], which were assigned as H-2′, H-5′, and H-6′, respectively.…”

“…Rhynchosia edulis Griseb, also known as the Chihuahuan snoutbean is a perennial vine belonging to the Fabaceae family. R. edulis is found predominantly in South and Central America [1]. There have been no previous phytochemical or pharmacological reports on this plant, although a number of glycosylated and prenylated flavonoids have been reported to be present in extracts of plants from the same genus [2][3][4][5].…”