Abstract

BELTRAMINI, Verónica S.; BORNAND, Alejandra del V.; MARTINAT, Jimena E.  and  GIL, Silvia P.. Morphoanatomical adaptations to xeric enviroments of Crotalaria chaco-serranensis, Desmodium incanum and Rhynchosia edulis (Fabaceae) native to the Sierras of Córdoba (Argentina). Lilloa [online]. 2023, vol.60, n.1, pp.83-95. ISSN 0075-9481.  http://dx.doi.org/doi.org/10.30550/j.lil/2023.60.1/2023.05.16.

The objective was to describe morphoanatomical characters adaptive to xeric environments, of vegetative organs of three species of the Fabaceae family: Crotalaria chaco-serranensis H. Bach & Fortunato, Desmodium incanum DC. and Rhynchosia edulis Griseb. from the Sierras Chicas of Córdoba. The anatomical structure of five specimens of each species was analyzed with temporary preparations and photomicrographs were taken. C. chaco-serranensis in root presented abundant amyloplasts. Stem with a collenchyma hypodermis and sclerenchyma with gelatinous fibers on the phloem. The leaflet was hypostomatic with simple unicellular trichomes on the abaxial surface and dorsiventral mesophyll. D. incanum, showed a root with early secondary growth. The stem presented epidermis with a thick cuticle and abundant trichomes. Layers of lamellar collenchyma were observed in the cortex followed by caps of gelatinous fibers and phenolic idioblasts in the medulla. The leaflet presented epidermis with abundant trichomes and phenolic idioblasts in phloem. R. edulis showed roots with secondary structure. Close to the neck of the main root, a xylopodium with parenchymatic marrow and amyloplasts was observed. Rhizomes with amyloplasts and phenolic idioblasts scattered in the parenchyma were evident. The stem presented thick cuticle, trichomes, lamellar collenchyma and phloem fibers. Dispersed in the phloem, phenolic compounds were detected in idioblasts.Leaflets with numerous trichomes and between the palisade and spongy parenchyma there was evidence of a continuous layer of phenolic idioblasts, the same as in the phloem but scattered. It is concluded that the analyzed species present morphological characters that allow them to adapt to xeric environmental conditions. These results serve as a basis for future studies on the restoration and conservation of native species in disturbed environments.

Keywords : Anatomy; fabaceae; xeric..

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