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Dépouillements
Ajouter le résultat dans votre panierLetters to the twenty-first century botanist, second series. “What is a seed ? – 2. Regulation of desiccation tolerance and longevity in developing seeds : two faces of the same coin" / Julia Buitink in Botany letters, vol. 165, n°2 (Année 2018)
Titre : Letters to the twenty-first century botanist, second series. “What is a seed ? – 2. Regulation of desiccation tolerance and longevity in developing seeds : two faces of the same coin" Type de document : texte imprimé Auteurs : Julia Buitink, Auteur ; Olivier Leprince, Auteur Année de publication : 2018 Article en page(s) : pp. 181-185 Langues : Anglais (eng) Mots-clés : dessiccation longévité des graines maturation développement semence graine Résumé : "Desiccation tolerance and longevity are two essential properties that enable seeds to ensure the plant life cycle. Desiccation tolerance is defined as the ability to tolerate a rapid drying that brings the seed moisture content in equilibrium with ambient air, whereas longevity is the capacity to remain alive in the dry state over long periods. Both properties are progressively acquired during seed development and are of considerable agronomic and ecological relevance. Here, we argue that desiccation tolerance and longevity should be considered and studied separately. Recent progress in elucidating the protective and regulatory mechanisms contributing to these two aspects of seed survival in the dry state is presented." (source : auteurs) Type de publication : périodique Référence biblio : Buitink J., Leprince O., 2018 - Letters to the twenty-first century botanist, second series. “What is a seed ? – 2. Regulation of desiccation tolerance and longevity in developing seeds : two faces of the same coin". Botany letters, 165 (2) : 181-185. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67964
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 181-185[article]Exemplaires(1)
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Titre : A new record of Portulaca (Portulacaceae) to La Réunion Island, Portulaca. cf. pilosa L. : native or recently (re-)introduced? Type de document : texte imprimé Auteurs : Stéphane Augros, Auteur ; Dominique Hoareau, Auteur ; Claudia Baider, Auteur Année de publication : 2018 Article en page(s) : pp. 193-199 Langues : Anglais (eng) Mots-clés : Portulacaceae Portulaca pilosa complex Mascarene islands species origin La Réunion Island Résumé : "Two species of Portulaca were currently reported from La Réunion Island, the native P. oleracea and the introduced P. quadrifida. A third species was presumed but never confirmed, P. pilosa. We recently found a population of P. cf. pilosa in a restricted area in the southwestern part of La Réunion, exclusively growing on tiles of tuff, a very singular and restricted habitat that also shelters some native and rare species, but is largely surrounded by alien vegetation. Given the cosmopolitan distribution of P. pilosa in warm regions, we suggest that the species could be alien. However, based on the wide infrageneric taxonomic resolution problems of Portulaca, coupled with the species’ alleged past records for the Mascarene and its presumed rarity, we call for more in-depth studies to assess the true origin and ecological significance of the species." Type de publication : périodique Référence biblio : Augros S., Hoareau D., Baider C., 2018 - A new record of Portulaca (Portulacaceae) to La Réunion Island, Portulaca. cf. pilosa L. : native or recently (re-)introduced? Botany letters, 165 (2) : 193-199. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67965
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 193-199[article]Exemplaires(1)
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Titre : Contribution to the flora of Asian and European countries : new national and regional vascular plant records, 7 Type de document : texte imprimé Auteurs : Marcin Nobis, Auteur ; Gianniantonio Domina, Auteur ; Marjol Meço, Auteur ; et al., Auteur Année de publication : 2018 Article en page(s) : pp. 200-222 Langues : Anglais (eng) Mots-clés : chorologie taxonomie native species alien species Asia Europe Résumé : "The paper presents new records for 29 vascular plant species from 12 Eurasian countries. Seven taxa (Agave sisalana, Austrocylindropuntia subulata, Lagurus ovatus subsp. nanus, Opuntia stricta, Orobanche serbica, Oxalis articulata, Vitis × instabilis) are reported from Albania, one (Allium carinatum) from the Europaean part of Russia, six (Dipsacus fullonum, Gagea shmakoviana, Mentha × dalmatica, Thymus indigirkensis, Thymus sergievskajae, Viola × sukaczewii) from the Asian part of Russia, two (Agrostis sozanensis, Poa mustangensis) from China, two (Carex muskingumensis, Sedum rubens) from Poland, two (Crataegus macrocarpa, Dactylorhiza lapponica) from Romania, two (Oxygraphis delavayi, Ranunculus eryuanensis) from Nepal, two (Erigeron bonariensis, Ophioglossum vulgatum) from Tajikistan, one (Ranunculus olgae) from Kazakhstan, one (Najas guadelupensis) from Hungary, one (Orobanche bartlingii) from Armenia, one (Crataegus petrodavisii) from Azerbaijan and one (Amaranthus powellii) from Georgia. For each species, synonyms, general distribution, habitat preferences, taxonomy with remarks on recognition, and differentiation the species from the most similar taxa occurring in a given country, as well as a list of recorded localities (often far from the previously known areas) are presented." Type de publication : périodique Référence biblio : Nobis M., Domina G., Meço M., et al., 2018 - Contribution to the flora of Asian and European countries : new national and regional vascular plant records, 7. Botany letters, 165 (2) : 200-222. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67966
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 200-222[article]Exemplaires(1)
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Titre : Developing a new variety of kentia palms (Howea forsteriana): up-regulation of cytochrome b561 and chalcone synthase is associated with red colouration of the stems Type de document : texte imprimé Auteurs : Alba Herraiz, Auteur ; Laura Stokes, Auteur ; Colin Turnbull, Auteur ; Ian Hutton, Auteur ; William J. Baker, Auteur ; Vincent Savolainen, Auteur Année de publication : 2018 Article en page(s) : pp. 241-247 Langues : Anglais (eng) Mots-clés : Howea horticulture anthocyanin RNA-seq qPCR Résumé : "The kentia palm (Howea forsteriana) is endemic to a 12 km2 volcanic island in the Tasman Sea, Lord Howe Island. It is one of the most traded houseplants in the world. The typical kentia palm presents a dark green-coloured stem. Note that the stem is made of leaf rachis and petioles, which are intermingled towards the base. However, we discovered on Lord Howe Island a new biological variety that has a red stem. Red-stemmed palm species are known and highly demanded as decorative plants. However, these red palm horticultural varieties require tropical or subtropical conditions to grow, hence commercialization is limited. Thus, a red-stemmed variety of H. forsteriana may have tremendous market potential. Nonetheless, palm trees grow generally slowly and often reach maturity at 15–20 years old or later, which may make conventional strategies unsuitable for the propagation of a new variety. This difficulty needs to be addressed before commercialization can be achieved. Here, we found that anthocyanin is responsible for the red colouration of the stem in the new variety. Using RNA sequencing and quantitative PCR, we identified two gene isoforms displaying altered expression associated with this red colouration, encoding a cytochrome b561 and a chalcone synthase. The latter protein is known to be part of the anthocyanin biosynthesis pathway, which plays a central role in pigmentation in plants. The levels of cytochrome b561 transcripts accumulated were found to be well correlated with an increased anthocyanin concentration in the red stems." Type de publication : périodique Référence biblio : Herraiz A., Stokes L., Turnbull C., Hutton I., Baker W., Savolainen V., 2018 - Developing a new variety of kentia palms (Howea forsteriana): up-regulation of cytochrome b561 and chalcone synthase is associated with red colouration of the stems. Botany letters, 165 (2) : 241-247. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67976
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 241-247[article]Exemplaires(1)
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Titre : The Guiana cacao genetic group (Theobroma cacao L.) : a new core collection in French Guiana Type de document : texte imprimé Auteurs : Philippe Lachenaud, Auteur ; Didier Clément, Auteur ; Xavier Argout, Auteur ; Simone Scalabrin, Auteur ; Fabien Doaré, Auteur Année de publication : 2018 Article en page(s) : pp. 248-254 Langues : Anglais (eng) Type de publication : périodique Référence biblio : Lachenaud P., Clément D., Argout X., Scalabrin S., Doaré F., 2018 - The Guiana cacao genetic group (Theobroma cacao L.) : a new core collection in French Guiana. Botany letters, 165 (2) : 248-254. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67977
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 248-254[article]Exemplaires(1)
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Titre : The 13C content of the orchid Epipactis palustris (L.) Crantz responds to light as in autotrophic plants Type de document : texte imprimé Auteurs : Félix Lallemand ; Alicja Robionek ; Pierre-Emmanuel Courty ; Marc-André Selosse Année de publication : 2018 Article en page(s) : pp. 265-273 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Epipactis palustris (L.) Crantz Mots-clés : Carbone 13 nutrition en carbone orchidée plante mixotrophe plante mycohétérotrophe réponse à l'ombre mixotrophie Résumé : "Most temperate green orchids form mycorrhizae with rhizoctonias fungi and are considered autotrophic. Some orchids, however, associate with fungi that also form ectomycorrhizae with surrounding trees and derive part of their carbon from these fungi. This evolutionarily derived condition, called mixotrophy, is characterized by natural 13C enrichment and high N content. Some orchid genera display both syndromes depending on species. Here, we further document the isotopic features of a rhizoctonias-associated species, Epipactis palustris, in a genus otherwise encompassing many mixotrophic orchids. First, E. palustris in two wetland sites from Northern Europe displayed similar to slightly-depleted 13C abundance and identical N content as compared with surrounding autotrophic plants, confirming published results on this species. Second, some individuals growing in darker conditions (63% reduced irradiation) revealed a decrease of 13C abundance as expected (and observed at the same place) for autotrophic plants. The latter result expands previous observations on other rhizoctonias-associated orchid species. We discuss our results in relationship with the current views of the two nutritional syndromes of green orchids (especially, with the doubts on autotrophy of rhizoctonias-associated species) and in the framework of the phylogeny of Epipactis that evolved secondarily mixotrophy. The latter observation entails that the tribe Neottieae repeatedly evolved mixotrophy." (source : auteurs) Type de publication : périodique Référence biblio : Lallemand F., Robionek A., Courty P.-E., Selosse M.-A., 2018 - The 13C content of the orchid Epipactis palustris (L.) Crantz responds to light as in autotrophic plants. Botany letters, 165 (2) : 265-273. ID PMB : 67978 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=67978
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 265-273[article]Exemplaires(1)
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Titre : Within-individual physiology constrains carnivorous investment in the rainbow plant Byblis guehoi more than does environmental light intensity Type de document : texte imprimé Auteurs : Weng Ngai Lam, Auteur ; Hao Ran Lai, Auteur ; Chien C. Lee, Auteur ; Hugh T. W. Tan, Auteur Année de publication : 2018 Article en page(s) : pp. 274-279 Langues : Anglais (eng) Mots-clés : Carnivorous investment cost–benefit model Byblis guehoi photosynthetically-active radiation phenotypic plasticity Résumé : "The cost–benefit model of plant carnivory posits that benefits of carnivory exceed its costs only in environments where light and moisture levels are high, while soil nutrient levels are low. Carnivorous investment is a plastic trait that can be regulated by individual plants. The literature provides strong support for nutrient-dependent plasticity in carnivorous investment, but is less conclusive regarding light-dependent responses, while nothing is known of the effect of within-individual physiological constraints on carnivorous investments in carnivorous plants. We examined the relative importance of light availability and within-individual factors on the carnivorous investment of Byblis guehoi Lowrie & Conran, a recently described flypaper-type carnivorous plant from Western Australia. Twelve pots of B. guehoi plants were cultivated under four different fluorescent light setups with 12-h, light–dark cycles under controlled laboratory conditions. Mucilage production after six weeks was quantified and modelled against light intensity and other within-individual factors. Total leaves borne per stem had a strong, hump-shaped relationship with mucilage production. Other within-individual factors were weak predictors as well, but light intensity was not a good predictor. Our results suggest that, contrary to the expectation of the cost–benefit model of plant carnivory, individual plant investment in carnivory may be more dependent upon within-individual physiological constraints than environmental light availability, although the latter is likely to affect carnivorous investment in more indirect ways through individual plants’ physiological conditions. These results thus do not contradict the cost–benefit model, but identify an important caveat to it, which may have been overlooked previously." Type de publication : périodique Référence biblio : Lam W., Lai H., Lee C., Tan H.-W., 2018 - Within-individual physiology constrains carnivorous investment in the rainbow plant Byblis guehoi more than does environmental light intensity. Botany letters, 165 (2) : 274-279. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68024
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 274-279[article]Exemplaires(1)
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Titre : Karyological study of some annual Polygonum species in Iran Type de document : texte imprimé Auteurs : Samaneh Mosaferi, Auteur ; Masoud Sheidai, Auteur ; Maryam Keshavarzi, Auteur ; Zahra Noormohammadi, Auteur Année de publication : 2018 Article en page(s) : pp. 280-285 Langues : Anglais (eng) Catégories : [Espèces (in biblio)] Polygonum
[ZG] IranMots-clés : nombre chromosomique caryotype Résumé : "Polygonum s.str. (Polygonaceae) is a genus with three basic chromosome numbers (x = 10, 20, 30) and different ploidy levels (from diploid to octaploid). In this study, karyological characteristics and mitotic numbers were presented for six annual species and subspecies of Polygonum sect. Polygonum in Iran (P. aviculare subsp. buxiforme, P. aviculare subsp. depressum, P. arenastrum, P. patulum, P. argyrocoleon and P. olivascens). Ploidy levels varied from diploid to pentaploid. There is not any correlation between genetic diversity previously studied and ploidy levels in taxa. Three counts are new while three records confirmed previous studies. All species have metacentric chromosomes. The studied taxa differed in the size of their chromosomes and in karyotype formula indicating the role of quantitative change in the chromatin (DNA) material as well as chromosomes structural changes in the species diversification." (source : auteurs) Type de publication : périodique Référence biblio : Mosaferi S., Sheidai M., Keshavarzi M., Noormohammadi Z., 2018 - Karyological study of some annual Polygonum species in Iran. Botany letters, 165 (2) : 280-285. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68197
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 280-285[article]Exemplaires(1)
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Titre : Pollen morphology of some Nepeta L. species in NW Iran Type de document : texte imprimé Auteurs : Seyed Mehdi Ravazi, Auteur ; Ali Asghar Ghaffari, Auteur ; Mahmoud Bidarlord, Auteur Année de publication : 2018 Article en page(s) : pp. 286-291 Langues : Anglais (eng) Mots-clés : Lamiaceae Nepteta pollen SEM taxonomie Iran Résumé : "The genus Nepeta L., with approximately 300 species, is one of the largest genera in the tribe Mentheae, subtribe Nepetinae of the Lamiaceae family. In the present work, pollen morphology of eight species of Nepeta was examined using scanning electron microscopy. The results indicated that the majority of the studied species were characterized by monad, hexazonocolpate, isopolar, heterobrochate, and prolate pollen grains. It was also revealed that there were some differences in pollen characters among the studied taxa. Hence, they could be divided into three major groups based on exine ornamentation. It is worthy of mention that the species pollen characters appear to correlate with the Rechiger (1982) subgeneric classification of Nepeta. However, due to different pollen attributes, it is suggested that Nepeta haussknechtii could be transferred to a new section. Pollen morphology of N. crassifolia, N. haussknechtii, N. speciosa and N. amoena was described for the first time." Type de publication : périodique Référence biblio : Ravazi S., Ghaffari A., Bidarlord M., 2018 - Pollen morphology of some Nepeta L. species in NW Iran. Botany letters, 165 (2) : 286-291. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68198
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 286-291[article]Exemplaires(1)
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Titre : Achene micromorphology of 26 Crepis L. (Asteraceae) taxa from Turkey with notes on its systematic and ecological significance Type de document : texte imprimé Auteurs : Nursen Aksu Kalmuk, Auteur ; Huseyin Inceer, Auteur ; Kemal Vehbi Imamoglu, Auteur Année de publication : 2018 Article en page(s) : pp. 292-306 Langues : Anglais (eng) Catégories : [ZG] Turquie
[Espèces (in biblio)] Crepis
[Thèmes] Ecologie
[Thèmes] TaxonomieMots-clés : Achene micromorphologie Résumé : "In this study, achene surface sculpturing and pappus ultrastructure of 26 Crepis taxa from Turkey were investigated using scanning electron microscopy (SEM). The achene microcharacters in the studied taxa were described here for the first time. Considerable differences in the shape of the epidermal cells and the ornamentation type of the outer cell wall have been found at interspecific levels. The differences in the achene surface sculpturing are also associated with achene dimorphism and habitat in some taxa. There are remarkable differences in the shape of the epidermal cells on the ribs of the achene among some clades within Crepis. The pappus ultrastructure is similar in all the taxa and is composed of spiky cells. Statistically significant difference has been found in the diameter of the pappus bristles among the taxa. It is concluded that achene micromorphology is useful for delimitation of the Crepis taxa. The microsculpture patterns on the ribs of the achene can also be used as a marker among major phylogenetic lineages as well as between closely related species. Additionally, the achene surface sculpturing could play an important role in the colonization of new habitats as well as in the adaptation to higher altitudes." (source : auteurs) Type de publication : périodique Référence biblio : Aksu Kalmuk N., Inceer H., Vehbi Imamoglu K., 2018 - Achene micromorphology of 26 Crepis L. (Asteraceae) taxa from Turkey with notes on its systematic and ecological significance. Botany letters, 165 (2) : 292-306. ID PMB : 68199 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68199
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 292-306[article]Exemplaires(1)
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Titre : Revision and new proposals regarding Salvia officinalis communities after new findings from the Abruzzo region, Central Adriatic Italy Type de document : texte imprimé Auteurs : Giampero Ciaschetti, Auteur ; Kevin Cianfaglione, Auteur ; Gianfranco Pirone, Auteur Année de publication : 2018 Article en page(s) : pp. 314-322 Langues : Anglais (eng) Mots-clés : Abruzzo Chamaephyte communities elementary area micro-mosaic garrigue plant association sage Salvia officinalis Résumé : "Salvia officinalis communities are not common in Italy. Until recently, the studies carried out in Italy have generally not always been thorough regarding the physiognomic type of these communities and have not clearly distinguished between the real garrigues and the pasture communities (with more or less abundant Chamaephytes). A finer approach, allowing a correct interpretation of micro-mosaic patchiness, is necessary when the “elementary area” is chosen to be analyzed, in order to permit this kind of distinction. In the Abruzzo region, on the Central Adriatic side of Italy, this species is quite rare and is exclusively represented by the angustifolia variety. Actually, only few S. officinalis communities were known and studied in the Abruzzo region. New localities were found for this species and related communities. A newly uploaded dataset from the region is documented here, combining literature review data and new relevés, and is analyzed by multivariate methods. Results show that the Salvia officinalis garrigues of the Abruzzo region are not all attributable to the same plant association, as the coenological features of these communities are quite variable, depending mainly on geomorphological and climate features. Only half of the literature relevés previously attributed to the Saturejo montanae-Salvietum angustifoliae association are clearly ascribable to it, while the other half concerns anomalous aspects, poor in diagnostic species. A new set of diagnostic and differential species is proposed for that association; and two new variants have been proposed. We also propose a new association: Euphorbio spinosae-Salvietum angustifoliae, with two sub-associations, both found in newly studied localities. Further similar thorough reviews are desirable for other associations described in South-Eastern Europe, taking into account a fine separation between chamaephyte dominated communities and those that are mainly hemicryptophytic." Type de publication : périodique Référence biblio : Ciaschetti G., Cianfaglione K., Pirone G., 2018 - Revision and new proposals regarding Salvia officinalis communities after new findings from the Abruzzo region, Central Adriatic Italy. Botany letters, 165 (2) : 314-322. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68200
in Botany letters > vol. 165, n°2 (Année 2018) . - pp. 314-322[article]Exemplaires(1)
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