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001-es BibID:	BIBFORM118729
035-os BibID:	(WoS)001196813800001 (Scopus)85185442437
Első szerző:	Oláh Viktor (biológus)
Cím:	Frond-level analyses reveal functional heterogeneity within heavy metal-treated duckweed colonies / Viktor Oláh, Kamilla Kosztankó, Muhammad Irfan, Zsuzsanna Barnáné Szabó, Marcel A. K Jansen, Sándor Szabó, Ilona Mészáros
Dátum:	2024
ISSN:	2667-064X
Megjegyzések:	Duckweeds (Lemnaceae) rapidly produce clonal populations that make them ideal models in plant physiological and ecotoxicological research. Yet, despite their genetic homogeneity, duckweed colonies are clusters of successively produced fronds with different ontogenetic states, and this heterogeneity has rarely been studied. We analyzed frond-level photosynthetic responses of three duckweed species (Spirodela polyrhiza, Landoltia punctata and Lemna minor) to hexavalent chromium and nickel by means of chlorophyll fluorescence imaging. Our aim was to test whether fronds, or frond zones in their different developmental stages respond differently to heavy metal stress. Different response patterns were found for the three tested species. Young fronds of S. polyrhiza were more sensitive to chromate but less affected by nickel compared to mature ones, while in La. punctata the opposite was found. In Le. minor cultures, young fronds were more sensitive to both heavy metals compared to mature ones. Within-frond patterns indicated that chromate inhibited the marginal frond regions strongest. In La. punctata and Le. minor, nickel was most detrimental in the developing frond regions. In contrast, in S. polyrhiza the middle zone of both young and mature fronds was affected strongest by nickel. The observed patterns suggest that internal redistribution of toxicants plays a key role in shaping duckweed responses. Results highlight that ontogenetically different parts of duckweed plants respond differently to environmental stimuli. Since duckweed-based impact studies and economical applications rely strongly on the interactions between the duckweed colony and its environment, frond-, and within-frond level analysis of duckweed responses comprise a unique tool to reveal uptake, re-distribution and mode of action of environmentally relevant substances.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk békalencse frond ontogenezis klorofill fluoreszcencia leképezés nehézfém stressz
Megjelenés:	Plant Stress. - 11 (2024), p. 1-11. -
További szerzők:	Kosztankó Kamilla Irfan, Muhammad (1995-) (PhD Environmental Sciences) Barnáné Szabó Zsuzsanna (2000-) Jansen, Marcel A. K. Szabó Sándor (1956-) (zoológus) Mészáros Ilona (1952-) (biológus)
Pályázati támogatás:	FK 134296 OTKA ÚNKP-23-5 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM119000
035-os BibID:	(WoS)001172954500001 (Scopus)85186455007
Első szerző:	Szabó Sándor (zoológus)
Cím:	Density-dependent facilitation and inhibition between submerged and free-floating plants / Sándor Szabó, Aliz Csizmár, Gergő Koleszár, Viktor Oláh, Sebastian Birk, Edwin T. H. M. Peeters
Dátum:	2024
ISSN:	0018-8158 1573-5117
Megjegyzések:	This study aimed at testing the hypothesis that free-floating plants may facilitate the growth of submerged plants under hypertrophic conditions and intermediate plant density. The effects of Lemna presence on the growth of two submerged plants (Elodea nuttallii and Ceratophyllum demersum) over a nitrogen gradient were experimentally investigated. This was complemented with analysing the presence of C. demersum and E. nuttallii in Hungary and in Germany in relation to the density of free-floating plants. Results showed a negative exponential pattern between underwater light intensity and Lemna cover. Ceratophyllum and Elodea relative growth rate decreased with increasing nitrogen concentrations and additional low Lemna density stimulated Ceratophyllum and suppressed Elodea. Elodea decreased linearly with Lemna density while Ceratophyllum showed a unimodal response. Total algal biomass (epiphytic and planktonic) was higher in Ceratophyllum than in Elodea treatments and decreased rapidly with increasing Lemna density. The field studies showed a positive relationship between Ceratophyllum and a negative one between Elodea and free-floating plant cover. This study clearly showed that free-floating plants can have either facilitating or inhibiting impact on the growth of submerged plants depending on cover density and macrophyte species. The facilitating effect on Ceratophyllum is most likely due to suppressing epiphytic algal growth.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk competition regime shift Ceratophyllum Elodea Lemna shading
Megjelenés:	Hydrobiologia. - 851 (2024), p. 2749-2760. -
További szerzők:	Csizmár Aliz Koleszár Gergő Oláh Viktor (1980-) (biológus) Birk, Sebastian Peeters, Edwin T. H. M.
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM132352
Első szerző:	Xuan, Pham Thi Hong
Cím:	Lemna gibba Clones Show Differences in Phenotypic Responses to the Light Environment / Pham Thi Hong Xuan, Raja Amri, Nguyen Phuong Bach, Muhammad Irfan, Manuela Bog, Klaus J. Appenroth, K. Sowjanya Sree, Marcel A. K. Jansen, Sándor Szabó, Ilona Mészáros, Viktor Oláh
Dátum:	2025
ISSN:	2223-7747
Megjegyzések:	Duckweeds are aquatic plants with a worldwide distribution that can thrive under very contrasting ambient conditions due to their diversity and high phenotypic plasticity. In this study, we analyzed and compared the responses of four clones (i.e., distinct accessions) of Lemna gibba to two different light intensities. The clones represented different geographical origins and, in addition to two diploid cytotypes, included one tetraploid mutant and a triploid interspecific hybrid. We hypothesized that clonal origin had an effect on light acclimation. We studied growth, morphological (frond size and shape, mass-to-area ratio), and photosynthetic (pigment composition, chlorophyll fluorescence induction) traits of these clones to test whether light acclimation was a conserved process or whether clonespecific strategies could be found. We also analyzed frond-level photosynthetic adjustment during ontogenesis to track how light acclimation evolved in developing fronds. Our results confirmed that even clones of the same duckweed species and a hybrid of closely related species followed partially different strategies in acclimation to ambient conditions. This acclimation involved various morphological, physiological, and biochemical adjustments but happened in a very short time window at the early life stage when young, still-developing fronds could flexibly achieve an optimized phenotype. In addition to explaining the worldwide success of duckweeds in colonizing very contrasting habitats, our results also highlight the importance of approaching duckweed responses at the frond level, where the actual acclimation takes place.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk duckweed frond light acclimation biodiversity photosynthesis photosynthetic pigments chlorophyll fluorescence
Megjelenés:	Plants-Basel. - 14 : 18 (2025), p. 1-22. -
További szerzők:	Amri, Raja Bach, Nguyen Phuong Irfan, Muhammad (1995-) (PhD Environmental Sciences) Bog, Manuela Appenroth, Klaus-Juergen Sree, K. Sowjanya Jansen, Marcel A. K. Szabó Sándor (1956-) (zoológus) Mészáros Ilona (1952-) (biológus) Oláh Viktor (1980-) (biológus)
Pályázati támogatás:	134296 OTKA
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