Morfología polínica de especies del género Senna (Fabaceae) del Sureste del Iberá, Corrientes, Argentina

Abstract

Pollen morphology of species of genus Senna (Fabales: Fabaceae) in Southeast Ibera, Corrientes, Argentina. The system of Ibera lake and marshes in the Province of Corrientes, covers an area of approximately 12 000km 2 , and is considered one of the most important wetlands in Latin America. Given the wide diversity of tropical communities in this area, it is important to generate new information about the different species of this ecosystem, through pollen morphology, as lake sediments favor the pollen grains conservation. With the aim to promote future research on systematics, vegetation history and melissopalynology of this region, this study attempted to describe the pollen morphology of the well represented genus Senna. For this, we conducted 5-8 days collection trips in Southeast Ibera, on a monthly basis between 2009 and 2011. Based on the plants collected, the literature review and databases from the herbarium of the Botanical Institute of Northeast Argentina, we developed a list of species for the Province of Corrientes. For the pollen morphology, we manually took at least three flower buds per flower in the sampled sites, and for those species not sampled in the field, samples were obtained from the IBONE herbarium. Palynological material preparation was carried out by a modified technique of Erdtman acetolysis. The palynological descriptions considered the polar and equatorial diameter, exine thickness, openings and sculptural elements. Our results showed that Senna genus is euripalynic, composed of 3-colporate pollen grains, small to medium size, radiosymmetric, isopolar, oblates-spheroidals to prolates, subcircular field, subtriangular to triangular and long colpis. We described for the first time, the pollen morphology of 17 species of the genus Senna for this area, and recognized two groups considering endoapertures: lalongates and circular. The list of species belonging to the genus Senna presented here could be considered in restoration and recovery plans. A major constraint for the correct interpretation of the environmental changes impacts in vegetation, whether of climatic and/or anthropogenic origin, is the knowledge of pollen morphology of tropical species. A palynological database is of high value for the interpretation and determination of plant species. Rev. Biol. Trop. 62 (2): 769-782. Epub 2014 June 01.

Palynological characterization of five species of Senna Mill (Fabaceae) in the Valleys Calchaquíes, Province of Salta, Argentina

“…Eje ecuatorial 17(20,2)22. Ora 3-6 (subcirculares) y 4-6 x 5-12 (Ventura & Huamán, 2008;Buril et al, 2011;Fernández-Pacella et al, 2013;Fernández-Pacella, 2014), las diferencias encontradas con el microscopio óptico (Tabla 1), permitieron elaborar una clave palinológica en la que se diferencian algunas especies y agrupan otras.…”

“…excelsa Irwin & Barneby (Fig. 23); en Fernandez-Pacella et al 2013 (Palacios-Chávez et al, 1996;Perveen & Qaiser, 1998;Faricelli et al, 2004;Ventura & Huamám, 2008;Sánchez-Dzib et al, 2009;Buril et al, 2011;Fernández-Pacella et al, 2013;Fernández-Pacella, 2014).…”

“…aphylla con ligeras rugulas; pero perforada en las restantes especies con variaciones entre rugulada y rugulada-fosulada. Esta variabilidad de los caracteres de la exina, también han sido observados y descriptos en el Tipo polínico Senna hilariana (Fernández-Pacella et al, 2013) y en el Tipo I y Tipo II que reúnen 16 especies del género Senna (Fernández-Pacella, 2014).…”

Pollen and spores morphology from the Holocene of the Iberá Wetlands in northeastern Argentina

“…The taxonomic analysis of pollen grains and spores presented in this contribution is a new study derived from previous studies carried out by Fernandez Pacella et al (2011), Fernandez Pacella (2013) and Fernandez Pacella & Lara (2019 in which paleoenvironmental interpretations based on main palynologic groups addressed. These works included the study of core samples obtained with a Livingston-type sampler from six lakes in their central and deepest parts on the western margin of the Iberá Wetlands.…”

A Review of Recent Studies on the Antioxidant and Anti-Infectious Properties of Senna Plants

“…Giving a unique description of general botanical characteristics is tedious given the numerous species included in this genus. Senna has paripinnate compound leaves, with leaflets facing opposite, and globose, cylindrical, or clavate glands on rachis, petiole, or stalk [18]. The flowers are generally yellow and appear in dense racemes.…”