Orlóci László

• csoportvezető at Magyar Agrár-és Élettudományi Egyetem

The breeding of the genus Lagerstroemia is a success story in more ways than one. The genetic variability of the species and the diversity of different traits provide breeders with excellent possibilities to produce new varieties. New products can be easily produced in nurseries. Their breeding and cultivability can be easily adapted to the product...

The importance of epigenetics in plant cultivation and breeding has been growing rapidly in the recent years, and this knowledge base is likely to expand further in the years ahead. The constantly changing climate means that our commercial and ornamental plants require reassessment and varieties need to be adapted to these climatic conditions. Epig...

The genus Rudbeckia has long played a very important role in ornamental plant cultivation and breeding. The ever-expanding variety range of many of its species is also suitable for use as potted ornamental plants and bedding plants, thus it can play a very important role in the management of urban green spaces. The development of urban vegetation i...

In the published publication [...]

Ocimum basilicum L. is a multipurpose plant species used in the horticultural sector as a medicinal, herbaceous and ornamental plant. In our experiment, the Hungarian cultivar O. basilicum Rokokó was treated with algae (Ecklonia maxima (Osbeck) Papenf.), horsetail (Equisetum arvense L.) extracts and humic extracts. The effect of the biostimulants o...

This research is part of a Hungarian Research OTKA project that examines the vegetation of sandy grasslands along the Danube. During this study, Festuca wagneri and Festuca tomanii were identified as potentially suitable grass species for urban planting and turf establishment based on preliminary research. Our aim was to determine the germination s...

One of the most effective means of increasing urban green areas is the establishment of roof gardens. They have many positive properties and ecological functions, such as filling empty spaces with plants, protecting buildings, dust retention and air cleaning. In the case of extensive constructions, mostly Sedum species are used, planted as carpet-l...

This survey is part of a Hungarian Research OTKA project that examines the vegetation of sandy grasslands along the Danube. During this study, two grass species, Festuca wagneri and Festuca tomanii, were identified as potentially suitable for urban planting and turf establishment based on preliminary research. Our aim was to determine the germinati...

Many cultivars of annual ornamental horticulture have great phenotypic qualities but are less tolerant to the effects of current climate change and urbanization. A good example of this in Hungarian ornamental breeding is the Rudbeckia hirta cultivar “Őszifény”. The objective of this study was to determine whether gamma mutation breeding (using 5 Gy...

Ornamental horticulture and breeding, as well as urban landscape architecture, are facing increasing challenges driven by an intensely changing climate and urbanisation. The expansion of cities should be combined with an overall growth of green spaces, where ornamental plant species and cultivars will have to withstand a diverse range of environmen...

In this study, we examined over 200-year-old Ginkgo biloba L. specimens under different environmental conditions. The overall aim was to explore which factors influence their vitality and general fitness in urban environments and thus their ability to tolerate stressful habitats. In order to determine this, we used a number of different methods, in...

Biostimulants and other plant growth promoters can provide an effective solution to the challenge of urbanisation and climate change. Viburnum opulus ‘Roseum’ is a globally popular deciduous shrub species that can be made more resistant to urban influences by using natural growth-promoting substances. In our study, we investigated the effects of gr...

There is no practical and at the same time objective colour system available for describing cultivated roses (Rosa L. cultivars). For this reason, a new colour classification system was developed which is colorimetrically balanced and appropriate for algorithmic colour identification; however, it is also suitable for field-work. The system is based...

Urban green areas serve both the mental and physical health of the people living in the settlements; therefore, the ornamental plants used on green areas currently have a prominent role in reducing the effects of climate change and urbanization, as well as in providing ecosystem services. This is a dynamically changing, new field that requires clos...

Global warming has led to irregular precipitation patterns and various abiotic and biotic stresses, resulting in unforeseen consequences for wildlife. Plant species are particularly vulnerable to these global climate changes, struggling to adapt to the increasing stressors. Urban environments exacerbate these challenges, further hindering plant sur...

Plant growth-promoting bacteria (PGPB) and other living organisms can help with the challenges of modern agriculture. PGPB offer ever-expanding possibilities for science and commerce, and the scientific results have been very advanced in recent years. In our current work, we collected the scientific results of recent years and the opinions of exper...

The breeding of resistant, high-yield, decorative ornamental plant varieties may be impacted by climate change in the future. The use of radiation induces mutations in plants, thereby increasing the genetic variability of plant species. Rudbeckia hirta has long been a very popular species in urban green space management. The goal is to examine whet...

Several recent studies have shown that glyphosate and its metabolite, aminomethylphosphonic acid (AMPA), resist rapid degradation and, therefore, can accumulate in plants. Continuing our previous research, we aimed to investigate the effect of indirectly spraying glyphosate on leaves and soil on non-target plants in the case of Helianthus annuus L....

Members of the family Inocybaceae (Agaricales, Basidiomycota), one of the most diverse ectomycorrhiza-forming macrofungi of urban landscapes were studied. We performed phylogenetic analysis of 28 specimens (23 Inocybe spp., 3 Mallocybe spp., 2 Pseudosperma spp.) collected in anthropogenically influenced habitats of Budapest, Hungary. The internal t...

Isépy István (1942-2022), magyar botanikus, flóra- és vegetációkutatóra emlékezünk. Már fiatal korától a növényvilág megismerése érdekelte, ezért a gimnázium elvégzése után az ELTE biológia-kémia tanári szakára jelentkezett, ahol 1966-ban szerzett diplomát. Az egyetem elvégzése után az ELTE Botanikus Kertben működő MTA kutatócsoportban kapott állás...

Soil alkalinization and salinization have increased worldwide due to extreme and/or prolonged drought periods as well as insufficient irrigation. Since crops generally react to soil salinity and high pH with decreased yield, the cultivation of tolerant biomass plants represents a reasonable alternative. Thus, we aimed to characterize the tolerance...

The biostimulant segment is becoming increasingly important worldwide. One of the reasons for this is that fewer plant protection products are placed on the market in the European Union, and environmental sustainability also plays an important role in their use. Biostimulants are often used in several horticultural sectors, including ornamentals, t...

Plant species have different degrees of allergenicity. Existing systems categorizing plants according their allergenicity were reviewed to find a method that could serve as the basis for the regulation of green areas. The categorization of plants by their allergenicity serves different purposes: informing allergic patients, warning consumers in hor...

Glyphosate is still the subject of much debate, as several studies report its effects on the environment. Sunflower (GK Milia CL) was set up as an experimental plant and treated with glyphosate concentrations of 500 ppm and 1000 ppm in two treatments. Glyphosate was found to be absorbed from the soil into the plant organism through the roots, which...

Palms are beneficial for urban ornamental horticulture, since they symbolize the tropics, but only few are adapted to temperate climates. Our objective was to monitor responses of the leaves to cold reflected by the changes in chlorophyll fluorescence of leaves of Trachycarpus geminisectus, T. nanus, T. takil, T. ukhrulensis, T. wagnerianus species...

Macrofungal investigations were performed in gardens and avenues planted with Tilia spp. between 2009 and 2020 in Hungary, focusing to the capital, Budapest. Linden tree (Tilia) is recently one of the most favorable commonly used ectomycorrhizal tree in urban landscaping in Budapest, similarly to other European cities. As a result of 71 sampling oc...

The aim of our work is to investigate the genus Phyllostachys whitch one of the best cold-tolerant genera of bamboos in these collections. Taxa of the genus Phyllostachys can be grown well in Hungarian conditions and can be classified as larger bamboos with their size. We examined in the largest Hungarian collections whether the most common taxa co...

A növényi pollen allergizáló képessége számos tényezőtől függ. E feltételek: a pollen allergiás immunválasz kiváltására alkalmas anyagot tartalmazzon, a pollent nagy mennyiségben termelje a növény, a pollenszem kis méretű legyen és könnyen, nagy mennyiségben szálljon a levegőben, a növény gyakori, tömegesen előforduló fajba tartozzon. E tényezőket...

Az egyes növényfajok, taxonok allergenitása alapján kiszámítható, hogy az egyes városi zöldterületek, parkok vagy fasorok esetén milyen mértékű a pollenterhelés. A városi parkok minősítésére külföldön már alkalmazott IUGZA módszert hazai parkok és vonalas létesítmények fásszárú növényzetén teszteltük. Az eredmények azt mutatták, hogy a módszer megf...

Introduction: Seasonal allergic rhinitis is a common disease in Hungary and has been considered a national affliction. Pollen information is proved to be an useful tool in the prevention of allergy. Urban green areas could act as a source of allergenic pollen grains. Their burden of allergy caused by green areas could be estimated with mathematical...