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Registros recuperados: 7
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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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Effects of Jatropha curcas oil inLactuca sativa root tip bioassays Anais da ABC (AABC)
ANDRADE-VIEIRA,LARISSA F.; BOTELHO,CAROLINA M.; LAVIOLA,BRUNO G.; PALMIERI,MARCEL J.; PRAÇA-FONTES,MILENE M..
Jatropha curcas L. (Euphorbiaceae) is important for biofuel production and as a feed ingredient for animal. However, the presence of phorbol esters in the oil and cake renders the seeds toxic. The toxicity ofJ. curcas oil is currently assessed by testing in animals, leading to their death. The identification of toxic and nontoxic improved varieties is important for the safe use of J. curcas seeds and byproducts to avoid their environmental toxicity. Hence, the aim of this study was to propose a short-term bioassay using a plant as a model to screen the toxicity of J. curcas oil without the need to sacrifice any animals. The toxicity of J. curcas oil was evident in germination, root elongation and chromosomal aberration tests in Lactuca sativa. It was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chromosomal aberration; Germination rate; Lactuca sativa; Phorbol esters; Root elongation.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100373
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Establishment of growth medium and quantification of pollen grains and germination of pear tree cultivars Rev. Ciênc. Agron.
Nogueira,Paulyene Vieira; Coutinho,Givago; Pio,Rafael; Silva,Daniel Fernandes da; Zambon,Carolina Ruiz.
ABSTRACT To support breeding programs of pear tree, on the selection of cultivars to subtropical area in Brazil, the objective of this research was to adjust the growth medium basic to pollen grain germination. The pollen grains of 'D'Água' cultivar were spread on the surface of Petri dishes containing 20 ml of culture medium in accordance with the following sequential experiments: 1) ágar (4; 6; 8 and 10 g L-1) and pH (3,5; 4,5; 5,5 and 6,5); 2) sucrose (0; 30; 60 and 90 g L-1); 3) calcium nitrate (0; 200; 400 and 800 mg L-1); 4) boric acid (0; 400; 800 and 1200 mg L-1); 5) temperature of incubation (15; 20; 25 e 30 ºC) and 6) emission time of the pollen tube (0; 1; 2; 3; 4; 5 and 6 hours after inoculation). After incubation, the germination rate of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pyrus communis; Pyrus pyrifolia; Breeding programs; Germination rate.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000200380
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Establishment of growth medium and quantification of pollen grains of olive cultivars in Brazil's subtropical areas Bragantia
Silva,Luiz Fernando de Oliveira da; Zambon,Carolina Ruiz; Pio,Rafael; Oliveira,Adelson Francisco de; Gonçalves,Emerson Dias.
ABSTRACT Pollen grain germination in vitro indicates viability and consequently provides information related to fruit set. It also assists in the development of hybrids. Along with a suitable species, a standard culture medium is essential for evaluating pollen viability. It should contain a gelling agent consisting of carbohydrates and enhancer elements as well as have the correct pH, temperature, and incubation time. The objective of this study was to optimise the culture medium, determine the pollen germination capacity, and quantify the number of pollen grains per flower of certain olive tree cultivars. A basic sequential culture medium for pollen grain germination was determined, always utilizing the best result from the previous experiment to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Olea europaea L.; Germination rate; Fruit set.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100026
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How and why to measure the germination process? Rev. Bras. Bot.
Ranal,Marli A.; Santana,Denise Garcia de.
In the last two centuries, papers have been published including measurements of the germination process. High diversity of mathematical expressions has made comparisons between papers and some times the interpretation of results difficult. Thus, in this paper is included a review about measurements of the germination process, with an analysis of the several mathematical expressions included in the specific literature, recovering the history, sense, and limitations of some germination measurements. Among the measurements included in this paper are the germinability, germination time, coefficient of uniformity of germination (CUG), coefficient of variation of the germination time (CVt), germination rate (mean rate, weighted mean rate, coefficient of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Germinability; Germination rate; Germination synchrony; Germination time; Germination uniformity.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000100002
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Overcoming dormancy and determining optimal temperature for slender serradella seed germination R. Bras. Zootec.
Lopes,Rodrigo Ramos; Souza,Cleber Henrique Lopes de; Bertoncelli,Patricia; Franke,Lucia Brandão.
ABSTRACT The objective of this study was to identify the most efficient method for overcoming coat-imposed dormancy and determine the optimal germination temperature for Ornithopus pinnatus seeds. Treatments to overcome dormancy were: intact seeds; immersion in hot water at 60 ºC, followed by soaking in the same water (unheated)/24 h; immersion in hot water at 90 ºC, followed by soaking in the same water (unheated)/24 h; mechanical scarification; chemical scarification, H2SO4/5 min; and chemical scarification, H2SO4/10 min. Percentages were calculated for germinated, abnormal, dormant, and dead seeds. Optimal germination temperatures were calculated using eight constant temperatures (0, 5, 10, 15, 20, 25, 30, and 35 °C), with 8 h of light and 16 h of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Germination rate; Ornithopus pinnatus; Scarification; Synchronization index of germination.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015001200413
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Temperature-dependent germination and endo-beta -mannanase activity in sesame seeds Rev. Bras. Fisiol. Veg.
CARVALHO,PATRÍCIA GONÇALVES BAPTISTA DE; BORGHETTI,FABIAN; BUCKERIDGE,MARCOS SILVEIRA; MORHY,LAURO; FERREIRA FILHO,EDIVALDO XIMENES.
The effects of temperature on germination and endo-beta-mannanase activity in seeds of Sesamum indicum was investigated. The minimum germination temperature (Tmin) lies between 12.8°C and 13.2°C while the maximum temperature (Tmax) is located between 45.5°C and 46°C. Germinabilities are statistically not different from estimated viability (88%) between 18.8°C and 43.2°C. The Mann-Whitney test indicated the interval 31.9°C to 35.1°C as the optimum temperature (Topt) range for germination rate. When seeds incubated at temperatures at or below the Tmin and close to or above the Tmax were transferred to 30°C, those incubated at lower temperatures achieved high germinability. On the other hand, the higher the pre-incubation temperature above Tmax, the lower the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Endosperm; Germination rate; Sesame.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000200003
Registros recuperados: 7
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