The plants live under different environmental conditions and then they present specific adaptations (morphological, anatomical, physiological), changing the shape of their organs and their structures. The macrophytes are plants adapted to live in wet soil, either partially or totally submerged. The analysis of the morpho-anatomical structure of macrophytes shows their adaptations such as heterophylly, the development of aerenchyma tissues, the reduction of supporting tissues, the simplification of conducting vessels, the disposing of stomata only on the upper epidermis of the floating leaves, their absence in the case of submerged leaves etc. (Antonescu, 1951, Leme & Scremin-Dias, 2014, Nakayama & Kimura, 2015, Huang et al., 2017 etc.). We present some anatomical aspects observed from a microscopic study of some macrophytes: Hippuris vulgaris L. (mare's-tail), Iris pseudacorus L. (yellow flag iris), Nuphar lutea (L.) Sm (yellow water lily). The sections were made on fresh material, according to the anatomical working rules (Ianovici, 2009, Arsene & Nicolin, 2016). To highlight certain tissues we used staining methods. Sectioned organs were: stems of Hippuris, leaf lamina of Iris, petioles and leaf lamina of Nuphar. By microscopial study, we saw that aerenchyma tissues are very well developed in all three species; endoderma is well represented in mare's-tail stems; we found the idioblasts in the spongy clorenchyma of the leaf lamina of yellow water lily; we have noticed that the leaves of the yellow water lily have a bifacial structure and the leaves of the yellow iris have ecvifacial structure. Our observations are completed by data from other authors who have studied these species: Schweingruber et al., 2013, Kane & Albert, 1987, Goliber & Feldman, 1990, Gontova & Zatylnikova, 2013, Marrotte, 2011, Klimenko, 2012, Bercu & Făgăraș, 2008. We mention that our results are presented also as bachelor thesis (Negruț, 2018).

anatomical study, macrophytes, aerenchyma, stomata, idioblasts

biology

Presentation: poster