GAYANA BOTANICAPub Date : 2023-06-01DOI: 10.4067/s0717-66432023000100038
Roberto Niculcar, Víctor Fajardo, Pedro Cuadra
{"title":"Effects of UV-B radiation on the morphology, UV-B absorbing compounds and photosynthetic pigment content of Plantago lanceolata and Rheum rhabarbarum","authors":"Roberto Niculcar, Víctor Fajardo, Pedro Cuadra","doi":"10.4067/s0717-66432023000100038","DOIUrl":"https://doi.org/10.4067/s0717-66432023000100038","url":null,"abstract":"In recent decades the fluence of ultraviolet-B (UV-B) radiation striking the ground has increased as a consequence of ozone depletion at southern latitudes. This phenomenon has sparked much interest in unravelling how plants acclimate to this condition. UV-B radiation triggers several responses that affect plant physiology, morphology and biochemistry. In this study, the effects of supplemental UV-B radiation on plant architecture, UV-B absorbing compounds and photosynthetic pigments were analyzed in two cosmopolitan species. A different range of responsiveness was found in the morphological parameters (leaf area, length and width; plant height) of species. The effects on photosynthetic pigment content and the UV-B absorbing compounds were studied through absorbance measurements. The obtained data showed that only carotenoids increased in irradiated plants of R. rhabarabarum. Likewise, an increase in the UV-B absorbing compounds content was found in irradiated plants from the same species. This effect may be regarded as a chemical protection against the damaging effects of light in photosynthesis and against oxidative cell damage. UV-B radiation induced photomorphogenic responses. In fact, all the morphological parameters of P. lanceolata were increased. The clear increase shown in leaf size and plant height suggest that cell division and stem elongation and/or differentiation processes are stimulated by UV-B radiation. These changes can be seen as an eustress effect and may indicate that plants are physiologically adapted to this level of UV-B radiation.","PeriodicalId":55127,"journal":{"name":"GAYANA BOTANICA","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135195776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
GAYANA BOTANICAPub Date : 2023-06-01DOI: 10.4067/s0717-66432023000100064
Eduardo Alanís-Rodríguez, Arturo Mora-Olivo, Víctor Manuel Molina-Guerra, Ana María Patiño-Flores, José Ángel Sigala-Rodríguez, Eréndira Zamudio-Castillo, Ernesto Rubio-Camacho
GAYANA BOTANICAPub Date : 2023-01-01DOI: 10.35513/botlit.2023.1.2
Amina Chaker, Kheireddine Fekroune, Amina Hassaine, A. Slimani, Labiba Zerari, R. Moulaï
{"title":"New data on lichen flora of the Edough Peninsula in north-eastern Algeria","authors":"Amina Chaker, Kheireddine Fekroune, Amina Hassaine, A. Slimani, Labiba Zerari, R. Moulaï","doi":"10.35513/botlit.2023.1.2","DOIUrl":"https://doi.org/10.35513/botlit.2023.1.2","url":null,"abstract":"New information on the diversity of lichen flora of the Edough Peninsula in Algeria is presented and analysed. This study aimed to estimate the diversity of corticolous lichens on the rhytidome of Quercus suber L. in the district of Seraïdi, Annaba town, which is situated in north-eastern Algeria. During this study, nineteen species new to the Edough Peninsula were identified. Two species of the Pannariaceae family, Pectenia plumbea (Lightf.) P.M. Jørg, L. Lindblom, Wedin & S. Ekman and Fuscopannaria leucosticta (Tuck.) P.M. Jørg., are rare in the region. Pectenia plumbea is a new species to the region, whereas Fuscopannaria leucosticta is new to the region and, after a long time, was rediscovered in Algeria.","PeriodicalId":55127,"journal":{"name":"GAYANA BOTANICA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85150098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
GAYANA BOTANICAPub Date : 2023-01-01DOI: 10.35513/botlit.2023.1.4
Z. Sinkevičienė
{"title":"Remarks on Myriophyllum sibiricum, a long-time unrecognised species of the flora of Lithuania","authors":"Z. Sinkevičienė","doi":"10.35513/botlit.2023.1.4","DOIUrl":"https://doi.org/10.35513/botlit.2023.1.4","url":null,"abstract":"This research aimed to verify the identification and distribution of Myriophyllum sibiricum in Lithuania. The study was based on a revision of available herbarium specimens and information from archival materials and literature sources. A total of 134 herbarium specimens of Myriophyllum, mainly initially identified as Myriophyllum spicatum, were examined. After revision of herbarium specimens, 101 of these were identified as Myriophyllum sibiricum. The remaining 33 herbarium specimens were tentatively determined as hybrids Myriophyllum sibiricum × Myriophyllum spicatum. None of the specimens were identified as Myriophyllum spicatum. The distribution of Myriophyllum sibiricum is related mainly to standing waters of upland regions, while localities of putative hybrid scattered throughout the area and associated with upland lakes and river stretches. The morphological features of the leaves (number of segments pairs and its angle with the central axis, occurrence of glands at the base of young leaves and in axils of leaves segments) are helpful to distinguish typical specimens of Myriophyllum sibiricum from Myriophyllum spicatum, however useless for their separation from the hybrid. This study revealed that further research on Myriophyllum sibiricum, Myriophyllum spicatum and their putative hybrid must apply morphological and molecular methods.","PeriodicalId":55127,"journal":{"name":"GAYANA BOTANICA","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81478706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}