Biochemical and allelopathic features of Adonis vernalis, Allium ursinum, and Leucojum vernum in the M.M. Gryshko National Botanical Garden of the NAS of Ukraine

2024-02-17T07:14:57-05:00

The article presents the results of a study on the content and dynamics of the accumulation of biogenic elements and brassinolides in plants of Adonis vernalis, Allium ursinum, and Leucojum vernum in Kyiv, Ukraine. Data is provided on allelopathic activity, content of macro- and microelements, phenolic compounds, and laccase activity in plants and the rhizosphere soil under the conditions of the M.M. Gryshko National Botanical Garden of the National Academy of Sciences of Ukraine (NBG). The plants from the collection of the NBG were used as objects of study in field experiments. The content of biogenic elements in plant tissues and soil was analyzed using an inductively coupled plasma spectrometer. The allelopathic analysis of soil was conducted using a direct bioassay method with Lepidium sativum seedlings as the test object. Phenolic compounds were extracted from the soil using the ion exchange (desorption) method. The content of brassinosteroids was measured spectrophotometrically at a wavelength of 450 nm. The content of laccase was measured spectrophotometrically at a wavelength of 530 nm.
The results demonstrate that model plant species employ a wide range of physiological mechanisms throughout the vegetation period to enhance their resistance to abiotic factors. These mechanisms include maintaining potassium and calcium balance and utilizing hormonal compounds. Plants have been proven to have compensatory mechanisms in response to stress factors, substituting one biochemical marker of resistance with another. Both, brassinosteroids and silicon, contribute to the adaptive capacity of organisms.

Epiphytic bryophyte communities of the Dendrological Park “Olexandria” of the NAS of Ukraine

2024-03-25T09:11:32-04:00

The article presents the results of research on epiphytic bryophyte communities of the Dendrological Park “Olexandria”. The study was conducted in the historical part of the arboretum in 2021. Among the investigated phorophytes were the following tree species: Acer platanoides, A. pseudoplatanus, Betula pendula, Carpinus betulus, Fraxinus excelsior, Quercus robur, Populus sp., Salix babylonica, and some others.
The research results showed that the epiphytic bryophyte vegetation of the historical part of the Dendrological Park “Olexandria” is represented by two unranked communities and 11 associations belonging to six unions, four orders, and three classes. The most widespread in the arboretum are the associations Dicrano scoparii-Hypnetum filiformis, Platygyrietum repentis, Leskeetum polycarpae, and the rankless community Leucodon sciuroides of the class Frullanio dilatatae-Leucodontetea sciuroidis.
It is shown that in terms of the number of detected bryophyte associations, the Dendrological Park “Olexandria” is similar to the National Nature Park “Homilsha Woods”, which is located in the Kharkiv region (hosts 11 reported associations) and the Nature Reserve “Kanivskyi” in the Cherkasy region (12 reported associations). However, it is poorer than the National Nature Park “Holosiivskyi” in Kyiv, where 16 bryoassociations were registered.

Plant Introduction

Biochemical and allelopathic features of Adonis vernalis, Allium ursinum, and Leucojum vernum in the M.M. Gryshko National Botanical Garden of the NAS of Ukraine

Epiphytic bryophyte communities of the Dendrological Park “Olexandria” of the NAS of Ukraine