The Plopul salt marshes, Tulcea County, developed within the perimeter of Lake Beibugeac, have been identified as having a high concentration of halophytes on a relatively small area of about 100 ha. These have formed vegetal communities that fit within two types of Natura 2000 habitats: 1310 Communities of Salicornia and other annuals colonising mud and sand and 1530* Pannonic salt steppes and salt marshes. Four of the 57 species recorded are rare at national level: Halocnemum strobilaceum, Limonium bellidifollium subsp. danubiale, Limonium meyeri and Salicornia prostrata. The area currently has a SPA (Special Protection Area) status, but the unique concentration of halophytes, the presence of Natura 2000 habitats and of rare species, also recommend the area for designation as a SCI (Sites of Community Interest).
It was studied the Senna alexandrina Mill. Fabaceae, Caesalpinioideae subfamily, synonym Cassia angustifolia Vahl. that has high pharmaceutical importance. The assessment was done using the plants growth in the research field of Botanical Garden. There were assessed the morphological characteristics and anatomical analysis were done in the stem and leaves. In the Romanian climatic conditions the Senna alexandrina is annual plant with taproot and the size of the stem is 40-70 cm. The leaves are alternate, pinnately compound with 3 to 7 pairs of minor leaflets and small stipules (2-3 mm). The leaflets are 2.5 - 4.5 cm length and 7-10 mm width, lanceolate to ovate in shape, entire blade, glabrous, acute apex, cuneate base, green to yellow-green colour. The flowers are yellow, with the terminal racemes of 10-15 cm length with 7-12 (19) flowers. The flowering starts in July until September. The fruit is a glabrous dehiscent pod, with 4-6 cm length, including 10-17 seeds. In the internal structure of the stem and rachis there are collaterally opened vascular bundles.The leaflets are amphystomatic with paracytic stomata and dorsiventrally mesophyll.
Wheat is the most cultivated plant and an important source of carbohydrates in the world. The Fe deficiency reduces quality of grain wheat leading to Fe deficiency in human. The purpose of this study was to investigate the effects of foliar and ground application of iron oxide nanoparticles (made in Romania) on growth components, yield and morphological and anatomical modifications of wheat plants. The ground application of iron oxide decreased height of plant, length of root and increased root volume and chlorophyll content more than foliar application. For the wheat plants fertilized with iron oxide nanoparticles, the decrease of root length was compensated by an increase of radicular density, which led to the development of new adventitious roots that could help the plants have a better uptake of water and nutrients. This meant that the production was not negatively influenced by the treatments performed, regardless of the application method. Our studies revealed that the fertilized wheat plants (foliar and root zone) presented anatomical changes in relation to control plants. The studies presented in this paper can contribute to achieve the necessary framework for the innovative development strategy regarding the efficiency of magnetic nanoparticles in foliar and ground fertilization of different crops.
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