The Role of Plant Growth Regulators in Ornamental Plants

A special issue of Horticulturae (ISSN 2311-7524). This special issue belongs to the section "Floriculture, Nursery and Landscape, and Turf".

Deadline for manuscript submissions: 31 May 2025 | Viewed by 4123

Special Issue Editors


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Guest Editor
Ornamental Plant and Green System Management Research Group, Institute of Landscape Architecture, Urban Planning and Garden Art, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary
Interests: biostimulator; urbanization; stress; climate change; ornamental plant; breeding; PGPB; phytoredemiation; plant genetic; sustainability

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Guest Editor
Ornamental Plant and Green System Management Research Group, Institute of Landscape Architecture, Urban Planning and Garden Art, Hungarian University of Agriculture and Life Sciences, 2100 Gödöllő, Hungary
Interests: dendrology; ornamental plant breeding; plant genetics; urbanization, climate change; sustainability; abiotic stress
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Special Issue Information

Dear Colleagues,

Currently, a significant challenge is the increasing impact of climate change and urbanization which affect all crops, including ornamental plants. The ornamental plant sector is a rapidly growing segment of horticulture and agriculture, becoming a major player in green space management, landscape architecture, breeding and the private sector in developing cities. However, to ensure that these plants can be used in good health and retain their ornamental value for a long time, it is worth using plant regulators. These compounds enhance nutrient uptake, photosynthesis and stress tolerance, contributing to the growth, foliage quality and flower production of ornamental plants. They help ornamentals withstand environmental stresses such as drought, heat and disease by strengthening plant metabolism and defence mechanisms, thereby reducing abiotic and biotic stresses that ornamentals have to adapt to during cultivation or subsequent plant application.

The market for biostimulants and plant growth regulators is expanding, as they offer a nature-based solution for sustainable cultivation. In many cases, the use of plant hormones also facilitates the achievement of optimum plant development, important for both plants and growers. Plant growth regulators can contribute to a more sustainable world in which we strive to maintain the delicate balance of ecosystems and biodiversity through ornamental plants.

In our Special Issue, we welcome researchers who would like to contribute to this topic with their research or review articles to further broaden the scope of plant growth regulator applications worldwide. We welcome articles on a wide range of topics in plant application, green space management, plant genetics, plant stress, physiological processes, cultivation and breeding.

Dr. Szilvia Kisvarga
Dr. László Orlóci
Guest Editors

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Keywords

  • plant growth regulator
  • biostimulant
  • ornamental plant
  • abiotic stress
  • hormone
  • urbanization
  • climate change
  • PGPB

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Published Papers (3 papers)

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Research

12 pages, 3302 KiB  
Article
Multipurpose Impacts of Silver Nitrate on Direct Organogenesis of Begonia rex cv. DS-EYWA via Transverse Thin Cell Layering (tTCL) Technique
by Mahboubeh Davoudipahnekolayi, Delaram Nezamdoost Darestani and Homa Mirshahi
Horticulturae 2024, 10(9), 986; https://doi.org/10.3390/horticulturae10090986 - 18 Sep 2024
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Abstract
Begonia rex cv. DS-EYWA is an important plant for indoor and outdoor cultivation, and cv. DS-EYWA is a rare unique cultivar with curly, colorful leaves. Due to their importance, applying plant tissue culture techniques for mass and healthy production in a short period [...] Read more.
Begonia rex cv. DS-EYWA is an important plant for indoor and outdoor cultivation, and cv. DS-EYWA is a rare unique cultivar with curly, colorful leaves. Due to their importance, applying plant tissue culture techniques for mass and healthy production in a short period of time without seasonal limitation is of immense economic value. Applying several concentrations of silver nitrate (AgNO3) in combination with varied concentrations of cytokinins including 6-benzylaminopurine (BAP), thidiazuron (TDZ) (0, 0.5, 1, 1.5 mgL−1), and 1-naphthaleneacetic acid (NAA) auxin (0, 0.5, 1 mgL−1) via focusing on transverse thin cell layer (tTCL) petiole explants for high-scale production was used to establish an efficient in vitro propagation protocol. Our results showed that even low concentrations (25 mgL−1) can control internal bacterial infection and increase shoot direct regeneration efficiency. A combination of 1.5 mgL−1 BAP, 0.5 mgL−1 NAA, and 25 mgL−1 AgNO3 was the best treatment to increase the number of direct regenerated shoots, and a lower concentration of BAP (0.5 mgL−1) can be suggested for shoot elongation. Elongated shoots were successfully rooted in MS basal medium and acclimatized in a 1:1 peat moss/perlite sterilized pot mixture. Full article
(This article belongs to the Special Issue The Role of Plant Growth Regulators in Ornamental Plants)
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16 pages, 9889 KiB  
Article
Non-Structural Carbohydrate Content and C:N:P Stoichiometry in Houpoea officinalis Flowers in Response to Development Stages
by Yao Yang, Yuxian Qiu, Yu Cheng, Ting Yu, Maoyuan Zhu, Wenzhang Qian, Shun Gao and Guoqing Zhuang
Horticulturae 2024, 10(8), 784; https://doi.org/10.3390/horticulturae10080784 - 25 Jul 2024
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Abstract
Mineral elements and non-structural carbohydrates (NSCs) are important nutrients and energy sources for flower development in plants. However, no studies were reported on the dynamic changes of nutrient stoichiometry and NSC contents in Houpoea officinalis (H. officinalis) flower. In this study, [...] Read more.
Mineral elements and non-structural carbohydrates (NSCs) are important nutrients and energy sources for flower development in plants. However, no studies were reported on the dynamic changes of nutrient stoichiometry and NSC contents in Houpoea officinalis (H. officinalis) flower. In this study, the changes in carbon (C), nitrogen (N), phosphorus (P), and NSC contents as well as C:N:P stoichiometry in the pistil, stamen, and petal of H. officinalis flowers at four developmental stages were comparatively analyzed. The results showed that C, N, P, and NSC contents, as well as C:N:P stoichiometric ratios in the three parts of the flower exhibited large variations at four development stages. Development stages and organs had significant effects on the measured parameters in the three organs of H. officinalis flowers, but their interactions had no significant effects. During the flower development, C, N, and P contents in different floral parts ranged from 418.7 to 496.3 mg/g, 26.6 to 45.3 mg/g, and 0.396 to 0.656 mg/g. P content decreased continuously with development, C:N in stamen were significantly higher than those in other flower parts at the same developmental stage. Glucose, starch, fructose, and sucrose contents showed significant differences in three parts of H. officinalis flowers at four development stages. These differences may reflect differences in elemental storage capacity and biomass allocation patterns of H. officinalis flowers. In general, our data will help to improve our understanding of the relationship between NSCs and C:N:P stoichiometry in response to development stages and organs in H. officinalis flowers. Full article
(This article belongs to the Special Issue The Role of Plant Growth Regulators in Ornamental Plants)
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16 pages, 4819 KiB  
Article
Morphological and Physiological Responses of Weigela florida ‘Eva Rathke’ to Biostimulants and Growth Promoters
by Dezső Kovács, Katalin Horotán, László Orlóci, Marianna Makádi, István Dániel Mosonyi, Magdolna Sütöri-Diószegi and Szilvia Kisvarga
Horticulturae 2024, 10(6), 582; https://doi.org/10.3390/horticulturae10060582 - 3 Jun 2024
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Abstract
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 [...] Read more.
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 environmental conditions, whereby they are often exposed to multiple stress factors. One of the most widely used ornamental shrub species Weigela florida ‘Eva Rathke’ was treated with the growth promoters Bistep with humic and fulvic acid, Kelpak® seaweed extract, and Yeald Plus with a high zinc content to test their applicability in a plant nursery. Bistep decreased the physiological parameters (the transpiration rate by 60%, the evapotranspiration rate by 56.5%, and the proline stress enzyme content level by 82.2%), indicating the stress level of the treated plants. The activity of β-glucosidase decreased with all growth-promoting treatments (11.5% for Kelpak and 9.5% for Yeald Plus), as did β-glucosaminidase (22.1% for Kelpak and 9.8% for Yeald Plus), but Bistep treatment reduced the activity of the enzymes less (9.9% for β-glucosidase and 3.3% for β-glucosaminidase). The measured alkaline phosphatase enzyme activity increased with treatment (by 10.7% for Kelpak, 11.7% for Yeald Plus, and 12.63% for Bistep). Based on the results, it was concluded that Bistep and Yeald Plus may be suitable for use in the studied variety, whereas Kelpak® may not be suggested in plant nurseries for growing W. florida ‘Eva Rathke’ plants. Full article
(This article belongs to the Special Issue The Role of Plant Growth Regulators in Ornamental Plants)
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