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Abiotic alterations caused by forest fragmentation affect tree regeneration: a shade and drought tolerance gradient in the remnants of Coastal Maulino Forest RChHN
GUERRERO,PABLO C; BUSTAMANTE,RAMIRO O.
Plant regeneration is strongly determined by light and soil moisture differences between habitáis; both variables are modified by large-scale forest fragmentation. Several studies have indicated this alteration as the mechanism involved in tropical forest community change. The effects of fragmentation may be much more severe in Mediterranean and deciduous forests, because plant species in these forests show a stress tolerance tradeoff between shade and drought. Our study was performed in the deciduous fragmented Coastal Maulino Forest: Reserva Nacional Los Queules (RNLQ) and surrounding small fragments. We hypothesised that Aristotelia chilensis (shade intolerant but drought tolerant) should increase its regeneration in small patches as a consequence of...
Tipo: Journal article Palavras-chave: Ecological restoration; Forest fragmentation; Safe sites; Seed germination; Seedling establishment.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300008
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Achene dimorphism in Bidens pilosa L. (Asteraceae) as determined by germination test BABT
Amaral,Adriana; Takaki,Massanori.
The germination of achenes of Bidens pilosa L. was analyzed during the life span of the mother plant. Decrease in the range of achene size was monitored until the senescence of the mother plant when the shortest achenes were harvested. The analysis of the germination percentage confirmed the presence of two distinct classes, formerly defined as short and long ones. Because length can not be used for the separation of those classes, the morphological characteristics of the tegument, specially of the ornament must be used for separation of the achenes with verrucose tegument (formerly named as short achenes) and achenes without ornament of the tegument (formerly named as long achenes). The achenes with verrucose tegument presented dormancy and light...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bidens pilosa; Seed dimorphism; Phytochrome; Seed germination.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100002
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Advances in passion fruit (Passiflora spp.) propagation Rev. Bras. Frutic.
Faleiro,Fábio Gelape; Junqueira,Nilton Tadeu Vilela; Junghans,Tatiana Góes; Jesus,Onildo Nunes de; Miranda,Diego; Otoni,Wagner Campos.
Abstract The propagation of many passion fruit species (Passiflora spp.) is done by seeds or sexual method, although asexual propagation, such stem cuttings, grafting or tissue culture is also possible and very useful in many cases. In this work, it was presented information on scientific and technological advances in sexual and asexual propagation of passion fruit, considering the different propagation methods and their applications. New demands for research and development activities are also related, given the wide range of passion fruit species and its potential for food, ornamental and medicinal use.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Seed germination; Vegetative propagation; Cuttings; Grafting; Tissue culture.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000201002
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'Aroeira-branca' [Lithraea molleoides (Vell.) Engl. - Anacardiaceae] seed quality evaluation by the X-ray test Scientia Agricola
Machado,Cibele Ferreira; Cícero,Sílvio Moure.
'Aroeira-branca', an arboreal species of great ecological and economic importance, is seed propagated and presents limitations with respect to the availability of methods for seed quality evaluation. The X-ray test has been considered of potential value because it is accurate, quick and nondestructive. In this context, the objective of this work was to verify the possibility of this test to detect damage and/or abnormalities in aroeira-branca embryos, in an attempt to correlate these anomalies to germination. Four seed lots were collected in different locations in the southern region of the State of Minas Gerais, Brazil, during 2001. The X-ray test consisted of submitting 100 seeds/lot to radiation (exposure of seeds to radiation of 13 kV/5 minutes) and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Radiography; Embryo morphology; Seed germination; Forest species.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200026
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Bioremediation of dyes by fungi isolated from contaminated dye effluent sites for bio-usability BJM
Rani,Babita; Kumar,Vivek; Singh,Jagvijay; Bisht,Sandeep; Teotia,Priyanku; Sharma,Shivesh; Kela,Ritu.
Biodegradation and detoxification of dyes, Malachite green, Nigrosin and Basic fuchsin have been carried out using two fungal isolates Aspergillus niger, and Phanerochaete chrysosporium, isolated from dye effluent soil. Three methods were selected for biodegradation, viz. agar overlay and liquid media methods; stationary and shaking conditions at 25 °C. Aspergillus niger recorded maximum decolorization of the dye Basic fuchsin (81.85%) followed by Nigrosin (77.47%), Malachite green (72.77%) and dye mixture (33.08%) under shaking condition. Whereas, P. chrysosporium recorded decolorization to the maximum with the Nigrosin (90.15%) followed by Basic fuchsin (89.8%), Malachite green (83.25%) and mixture (78.4%). The selected fungal strains performed better...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bioremediation; Dyes; Fungi; Microbial bioassay; Seed germination.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000300039
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Calculating germination measurements and organizing spreadsheets Rev. Bras. Bot.
Ranal,Marli A.; Santana,Denise Garcia de; Ferreira,Wanessa Resende; Mendes-Rodrigues,Clesnan.
With the objective to minimize difficulties for beginners we are proposing the use of a conventional spreadsheet for the calculations of the main germination (or emergence) measurements, the organization of the final data for the statistical analysis and some electronic commands involved in these steps.
Tipo: Info:eu-repo/semantics/other Palavras-chave: Germination rate; Germination time; Seed germination; Synchrony; Uncertainty.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000400022
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Casuarina equisetifolia fitorremeciación de suelo contaminado con diesel y aplicación de bioestimulación y bioaumentación. Colegio de Postgraduados
Díaz Martínez, María Esther.
En este trabajo se evaluó la germinación de semillas y el crecimiento de plantas de C. equisetifolia L. ante diesel, y su potencial de fitorremediación en combinación de bioaumentación y bioestimulación. La primera fase experimental evaluó el efecto tóxico de 15 dosis de diesel (0, 100, 250, 500, 800, 1000, 1500, 2000, 2500, 3000, 5000, 7500, 10000, 15000 y 20000 mg kg-1) en la germinación de semillas y la emergencia de plántulas. A los 10 días, la germinación fue mayor en concentraciones altas de diesel; la mayor geminación ocurrió en 20000 mg kg-1, y la menor se registró ante 5000 mg kg-1. La emergencia de plántulas fue mayor en las concentraciones menores a 5000 mg kg-1. A los 15 días, el crecimiento de las plántulas disminuyó ante concentraciones...
Palavras-chave: Germinación; Emergencia de plantas; Simbiosis; Fertilización; Microorganismos; Degradación de hidrocarburos; Seed germination; Seedling emergence; Symbiosis; Fertilization; Microorganisms; Hydrocarbon degradation; Maestría; Edafología.
Ano: 2012 URL: http://hdl.handle.net/10521/730
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COMPETITIVE EFFECTS OF THE ALIEN INVASIVE CENTAUREA SOLSTITIALISL. ON TWO CHILEAN BACCHARIS SPECIES AT DIFFERENT LIFE-CYCLE STAGES Gayana Botánica
Gómez-González,Susana; Cavieres,Lohengrin A; Torres,Patricio; Torres-Díaz,Cristian.
Several studies have revealed a variety of mechanisms of invasion of alien plant species. However, little is known on how those mechanisms and their associated effects on native species change across different life-cycle stages. Under controlled conditions, we assessed the interactions between the alien invasive species Centaurea solstitialis L. (Asteraceae) and two pioneer native species to the Chilean matorral; Baccharis linearis (Ruiz et Pav.) Pers. and B. paniculata DC. (Asteraceae). Competitive effects of the invader on natives were evaluated by combining different life-cycle stages: seed-seed, plant-seed, and plant-plant. Seed germination of C. solstitialis was explosive and much faster than that of the native species. The presence of C. solstitialis...
Tipo: Journal article Palavras-chave: Allelopathy; Matorral; Mediterranean; Seed germination; Yellow starthistle.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000100007
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Conditions for the germination and the early growth of seedlings of Polaskia chichipe (Goss.) Backeberg and Echinocactus platyacanthus Link and Otto fa. grandis (Rose) Bravo-Hollis (Cactaceae): (with 2 tables & 2 figures) Phyton
Rosas-López,Ulises; Collazo-Ortega,Margarita.
The effect of different combinations of chemical scarification, soaking and substrates (ex vitro and in vitro) on seed germination ofPolaskia chichipe (Goss.) Backeberg and Echinocactus platyacanthus Link & Otto fa. grandis (Rose) Bravo-Hollis, collected in the Tehuacan Valley, Mexico, were studied. The P chichipe seeds did not require either chemical scarification or soaking, whereas E platyacanthus required chemical scarification with strong acids. Growth and maintenance of the seedlings was evaluated in two different concentrations of Murashige-Skoog medium (50% and 100% of their components). It was found that MS 50% stimulated germination in both species and promoted seedling growth.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Polaskia chichipe; Echinocactus platyacanthus; Cacti; Seed germination; Establishment; Seedling growth.
Ano: 2004 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572004000100026
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Development of artificial sugarcane seed CP-54 from three cultivars (cv MEX 69-290; cv MEX 68-P-23; cv. CP 72-2086) using polymers in Tabasco, Mexico Acta Agron. (Palmira)
Álvarez-Sánchez,Geiner F; Arias-de la Cruz,Heidi L; Salgado-García,Sergio; Córdova-Sánchez,Samuel; Ortiz-Laurel,Hipólito; Castelán-Estrada,Mepivoseth; García-de la Cruz,Rubén; Castañeda-Ceja,Raúl.
Abstract Precision mechanized sowing of sugarcane has been delayed due to germination failures caused in sowing process by pieces of sugarcane, generating economic losses by reducing production. The aim of this study was to evaluate different polymers and cultivars of sugarcane to elaborate artificial seed CP-54, seed germination and quality of sugarcane plants. An experiment was carried out in two stages in experimental field of the Colegio de Postgraduados Campus Tabasco, Mexico. Results indicate that the best physical stage of artificial seed CP-54 was obtained in Mex 69-290, Mex 68-P-23 and CP 72-2086 cultivars encapsulated with starch polymers and sodium alginate. Artificial seed CP-54 germination was 100 and 84% encapsulated with starch and alginate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Encapsulation; Precision agriculture; Saccharum spp.; Seed germination; Buds; Sugarcane response.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100094
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Do fruit morphology and scarification affect germination and predation rates of Babassu seeds? Acta Botanica
Ferreira,Paulo Henrique Gonçalves; Nunes,Yule Roberta Ferreira; Faria,Maurício Lopes; Brandão,Murilo Malveira; Costa,Cibele Stramare Ribeiro; Valério,Henrique Maia; Melo,Geraldo Aclécio; Pimenta,Marcio Antonio Silva.
ABSTRACT Seed predation is a natural phenomenon that can occur either before or after dispersal and can significantly reduce the economic value and reproductive potential of plants. The babassu palm (Attalea vitrivir, Arecaceae) is important to rural communities that extract oil from its fruits for a wide variety of uses. We evaluated the predation and germination of A. vitrivirseeds in Pandeiros River Environmental Protection Area (EPA-Pandeiros) in Minas Gerais State, Brazil. Sixty individual plants were evaluated to determine their fruiting patterns. Seed predation and germination were evaluated in the natural environment for eight months for fruits divided into two treatments: scarified and intact. Germination of fruits submitted to these same...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arecaceae; Attalea vitrivir; Babassu palm; Fruit; Seed germination; Seed predation.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000400658
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Efeito do período de envelhecimento acelerado no teste de condutividade elétrica e na qualidade fisiológica de sementes de feijão Agronomy
Binotti, Flávio Ferreira da Silva; UNESP; Haga, Kuniko Iwamoto; UNESP; Cardoso, Eliana Duarte; UNESP; Alves, Charline Zaratin; UNESP; Sá, Marco Eustáquio de; UNESP; Arf, Orivaldo; UNESP.
A qualidade das sementes colocadas à disposição do produtor é de grande importância para obtenção de altas produtividades. O objetivo do trabalho foi avaliar os efeitos causados por diferentes períodos de envelhecimento artificial na lixiviação de açúcares, proteínas, aminoácidos e íons no exsudato do teste de condutividade elétrica, e suas relações com a germinação e vigor de sementes de feijão da cultivar Pérola. O trabalho foi conduzido no Laboratório da FE de análises de sementes - Unesp Campus de Ilha Solteira. O delineamento experimental foi o inteiramente casualizados, sendo que as sementes foram submetidas a oito períodos de envelhecimento acelerado (zero, 24, 48, 72, 96, 120, 144 e 168 horas). A germinação e vigor de sementes de feijão cultivar...
Palavras-chave: 5.01.03.05-9 Melhoramento Vegetal Phaseolus vulgaris L.; Lixiviados; Proteínas; Íons; Germinação; Vigor 5.01.03.05-9 Melhoramento Vegetal Phaseolus vulgaris L.; Leakage; Protein; Ions; Seed germination; Vigor.
Ano: 2008 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1736
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Effect of biologically treated petroleum sludge on seed germination and seedling growth of Vigna unguiculata (L.) Walp. (Fabaceae) BABT
Sangeetha,Jeyabalan; Thangadurai,Devarajan.
The present investigation was carried out to study the response of different concentrations of treated petroleum sludge on seed germination, root and shoot length and tolerance of Vigna unguiculata (L.) Walp. The biologically treated petroleum sludge with bacterial consortium showed 54.8% reduction in total petroleum hydrocarbons. Treated sludge was utilized with agricultural soil in known concentration for the assessment of growth of V. unguiculata. A remarkable absence of seed germination was observed at higher sludge concentration. The different concentrations of treated petroleum sludge showed severe decline on the length, weight and vigour index of the tested seedlings with increasing sludge concentrations. The results showed that the difference in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bacterial consortium; Biodegradation; Petroleum sludge; Seed germination; Total petroleum hydrocarbon; Vigna unguiculata.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000300017
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Effect of light and temperature on seed germination in Tibouchina mutabilis (Vell.) Cogn. (Melastomataceae) Biota Neotropica
Simão,Edson; Takaki,Massanori.
The effect of light and temperature on Tibouchina mutabilis seed germination was analyzed by isothermic incubations in the range of 10 to 40 °C, with 5 °C intervals under both continuous white light (32.85 µmolm-2s-1) and darkness and alternating temperatures (15-20; 15-25; 15-30; 15-35; 20-25; 20-30; 20-35; 25-30; 25-35 and 30-35 °C) under both photoperiod of 12 hours and continuous darkness. The seeds of T. mutabilis need light to trigger the germination and no germination was observed in darkness. The range of optimum temperatures for germination was between 25 to 30 °C and the 20-25 °C alternating temperatures. These results indicate that T. mutabilis behaves as a pioneer species and daily alternating temperatures did not change the light sensitivity...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Light; Phytochrome; Seed germination; Tibouchina.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200006
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Effect of nursery seeding date and phosphorus fertilization on rice seedling growth International Rice Research Institute
Kumar, K. A.; Reddy, M. D..
p.50-52
Palavras-chave: Seedlings; Seedling growth; Seed germination; Sowing date; Phosphorus fertilizers; Application rates; Dry matter; Earliness; Plant height; Leaves; Plumules; Roots; Shoots.
Ano: 2003 URL: http://hdl.handle.net/123456789/1262
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Effect of preheat treatment, chemical stimulant and moisture regime on weed seed germination under controlled and lowland rice soil conditions International Rice Research Institute
Jayawardane, Koshala J.D.M..
124 l. : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice soils; Lowlands; Weeds; Seed germination; Heat treatment; Soil water regimes.
Ano: 1989 URL: http://hdl.handle.net/123456789/1135
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Effects of different temperatures on the performance of seeds germination of Cecropia pachystachya Trec. (Cecropiaceae) BABT
Pilati,Rosemari; Andrian,Izabel de Fátima; Carneiro,José W. P..
Seed germination of Cecropia pachystachya Trec. was investigated at 25, 30, and 35ºC using fluorescent day lights. Ten replicates each of 200 seeds were used in each thermal treatment. Germitest® paper, CEL-065®, and 11x11x5 cm Gerbox® were also used. The frequencies of radicle protrusions were counted at consecutive two hour intervals. The cumulative frequencies were combined with the distribution of Weibull using the following model: Y = M (1 - exp (-(t/b)c)). The best performance was achieved with the temperature of 30ºC ( M, 95.29%). Time to achieve 60.23% of seed germination (0.6321 x 95.29%) was 99.35 h with a spread of 7.19. All model/data set combinations had close to linear.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cecropia pachystachya; Seed germination; Weibull function.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000200010
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Effects of salinity on seed germination, seedling growth and survival of Spartina ciliata Brong Acta Botanica
Cordazzo,César Vieira.
The effects of different salinities on the germination of Spartina ciliata seeds were tested during 40 days in the laboratory, using six concentrations of NaCl (0,45, 80, 130, 170 and 215 mM) besides three concentrations of seawater (25,30 and 35‰). In addition, the survival and growth of seedlings were tested in five constant salinity regimes (0,45, 80 and 170 mM NaCl) as well as in five regimes of simulating seawater overwash. The results showed that seeds possed a high germination capacity over a wide range of salinities (0 to 215 mM NaCl). Although concentrations close to full-strength seawater completely inhibited seed germination, the transfer of the ungerminated seeds to freshwater immediately stimulated this. The effects of salinity on seedling...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Salinity stress; Seed germination; Seedling growth; Coastal dune plant; Spartina ciliata.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061999000300012
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Exploring Herbicidal Potential of Aqueous Extracts of Some Herbaceous Plants Against Parthenium Weed Planta Daninha
SAFDAR,M.E.; TANVEER,A.; KHALIQ,A.; ALI,H.H.; BURGOS,N.R..
To assess the phytotoxic potential of Achyranthes aspera, Alternanthera philoxeroides, Datura metel and Rumex dentatus against Parthenium hysterophorus, 5% (w/v on dry weight basis) aqueous extracts from root, stem, leaf, flower and whole plant were tested through a Petri plate-based germination and pot-cultured seedling bioassays. Achyranthes aspera and A. philoxeroides inhibited parthenium weed germination more than extracts from other species. Whole plant, leaf and fruit extracts of A. aspera reduced the germination percentage (5%); leaf extract from A. philoxeroides caused lower germination index (0.4), higher mean germination time (14 d) and longer time to 50% germination (13.5 d) of parthenium weed. In the foliar spray bioassay, A. aspera reduced...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allelopathy; Bio-herbicides; Parthenium weed; Seed germination; Seedling growth; Weed management.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000100109
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Flavonoids from leaves of Derris urucu: assessment of potential effects on seed germination and development of weeds Anais da ABC (AABC)
SILVA,EWERTON A.S. DA; LÔBO,LÍVIA T.; SILVA,GEILSON A. DA; SOUZA FILHO,ANTONIO PEDRO DA S.; SILVA,MILTON N. DA; ARRUDA,ALBERTO C.; GUILHON,GISELLE M.S.P.; SANTOS,LOURIVALDO S.; ARRUDA,MARA S.P..
In some previous studies, we described the isolation of nine compounds from leaves of Derris urucu, a species found widely in the Amazon rainforest, identified as five stilbenes and four dihydroflavonols. In this work, three of these dihydroflavonols [urucuol A (1), urucuol B (2) and isotirumalin (3)] were evaluated to identify their potential as allelochemicals, and we are also reporting the isolation and structural determination of a new flavonoid [5,3′-dihydroxy-4′-methoxy-(7,6:5″,6″)-2″,2″-dimethylpyranoflavanone (4)]. We investigated the effects of the dihydroflavonols 1-3 on seed germination and radicle and hypocotyl growth of the weed Mimosa pudica, using solutions at 150 mg.L–1. Urucuol B, alone, was the substance with the greatest potential to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Derris urucu; Flavonoids; Allelopathy; Development of weeds; Seed germination.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000300881
Registros recuperados: 67
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