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| Registros recuperados: 94 | |
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| Martins,Alexandre Cristante; Marchioretto,Rafaella Migliavacca; Vieira,Ariane Tonetto; Stiehl-Alves,Eudes Maria; Santos,Eliane Kaltchuk dos; Souza-Chies,Tatiana Teixeira de. |
| ABSTRACT South Brazilian grasslands are among the most species-rich grasslands worldwide yet they have been suffering ongoing degradation due to land-use. Little is known about the reproductive ecology of the native species of these grasslands. Thus, our goal was to characterize seed traits and germination requirements of three native species of the tribe Tigridieae (Iridaceae, Iridoideae) due to its richness in the Pampa biome and the contrasting morphology, cytogenetics, and geographic distributions of its representatives. We tested if closely related species possess similar seed traits and whether species with wider distributions have broader germination requirements. Seed production and mass were estimated, and morphological analyses, germination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormancy; Functional traits; Germination; Grasslands; Iridaceae; Photoinhibition; Regeneration niche; Reproductive ecology; Seed morphology; Time-to-event analysis. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400730 |
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| Rodrigues, Adriana Paula D'Agostini Contreiras; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Kohi, Marilda Cervi; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Pedrinho, Denise Renata; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Arias, Edilson Rubens Arrabal; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Favero, Silvio; Universidade para o Desenvolvimento do Estado e da Região do Pantanal. |
| Objetivou-se o estudo de diferentes tratamentos para superar a dormência de sementes da espécie arbórea Acacia mangium Willd. Os tratamentos avaliados foram: imersão das sementes em ácido sulfúrico (96% PA) por 15, 30, 60 e 90 minutos; imersão das sementes em água fervente (100°C) por 15, 30 e 60 segundos e testemunha sem tratamento prévio das sementes. Foram utilizadas quatro repetições de 100 sementes por tratamento. Após tratadas, colocaram-se as sementes para germinar em caixas gerbox, com papel filtro umedecido, na temperatura média de 27,5ºC. As avaliações foram diárias, por 21 dias. Foram avaliadas as seguintes variáveis: porcentagem de germinação, primeira contagem do teste de germinação, velocidade de germinação e o índice de velocidade de... |
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Palavras-chave: 5.01.03.05-9 Melhoramento Vegetal Acacia mangium; Sementes; Dormência; Escarificação 5.01.03.05-9 Melhoramento Vegetal Acacia mangium; Seeds; Dormancy; Scarification. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1786 |
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| Castro, Damián César; Alvarez, Norma; Gabriel, Paola; Buyatti, Marcela; Favaro, Juan Carlos; Gariglio, Norberto. |
| The purpose of this work was to study the response of two apple cultivars bred for low chilling environments to artificial chilling accumulation. Two trials were carried out; in experiment one, excised shoots were randomly taken from “Caricia” and “Princesa”, and in experiment two, intact and excised shoots of “Caricia”, “Princesa” and “Gala” (control) were collected. After collection, both shoot types were exposed to artificial chilling accumulation (4.0 ± 0.5°C) from 0 to 1200 chill units (CU). Bud break of mixed buds of “Caricia” and “Princesa” was higher than 50% between 0 CU to 1200 CU, irrespective of shoot type. Bud break of “Gala” mixed buds exceeded 50% only in intact shoots after accumulating 900 CU. The mean time to bud break of “Caricia” and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malus domestica Borkh; Dormancy; Bud break; Lack of chilling; Heat requirements. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30996 |
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| Drumond, Anailda Angélica Lana; Sales, Juliana de Fatima; Zuchi, Jacson; Camelo, Gessimar Nunes; Souza, Moara Mariely Vinhais. |
| Environment and storage time influence stored seed quality, especially for oilseeds such as castor beans because they have a high lipid content and are more prone to deterioration. This study evaluated the physiological quality of seeds from three castor bean genotypes stored at 10 and 20°C for 300 days. The experimental design was completely randomized, with 4 replications, in a 2 x 6 (2 temperatures x 6 storage periods) split-plot design. The seeds were placed in low-density polypropylene bags and stored in climatic chambers at 10 and 20°C, in which the temperature and relative humidity were registered. Physiological quality (germination, germination rate index, emergence, rate of emergence, electrical conductivity and accelerated aging) were evaluated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ricinus communis L.; Seed conservation; Dormancy; Temperature. Produção e Beneficiamento de Sementes. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/43583 |
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| Urtasun, María Manuela; Giamminola, Eugenia Mabel; Viana, Marta Leonor de. |
| In this work, we report the effects of the harvesting time, the stages in fruit ripening and the influence of potassium nitrate in V. quercifolia seed germination. In addition, information about the storage period and light requirements is provided. Fruits were harvested at the beginning and at the end of the fruiting season, and they were classified into five ripening categories. Seed germination was evaluated with two factorial experiments: 1) harvesting time, fruit ripening, and pre-germination treatment; 2) storage and light requirements. The response variables were germination percentage, mean germination time, and seedling vigor. Seeds harvested at the beginning of the season appeared to be less dormant and they were not influenced by fruit ripening... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caricaceae; Dormancy; Photoblastism; Potassium nitrate.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42825 |
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| SANTOS,LIDIANE F. DOS; LANA,ROGÉRIO P.; SILVA,MARLIANE C.S. DA; VELOSO,TOMÁS G.R.; KASUYA,MARIA CATARINA M.; RIBEIRO,KARINA G.. |
| Abstract Effective microorganisms (EM) are inoculants formed by fungi and bacteria isolated from soil. EM are commonly used by farmers on agronomic crops to stimulate plant growth, but their composition and their benefits has been controverted. This study aimed to analyze the diversity of microorganisms growing in three EM inoculants, as well as to evaluate their efficiency in the germination of palisade grass seeds. The total DNA of the three EM inoculants was extracted, the 16S rRNA and ITS genes were amplified by PCR and sequenced on the Illumina MiSeq platform. Germination tests were conducted with three type of the EM, in three concentration and two times of the immersion. The bacterial group was the most abundant in EM, followed by fungi. Bacterial... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Dormancy; Sequencing; Sulfuric acid. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000201002 |
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| Malavasi,Ubirajara Contro; Malavasi,Marlene de Matos. |
| Enterolobium contortisiliquum (Vell.) Morong. is a Mimosaceae tropical tree species recommended for heterogeneous reforestation of degraded tropical areas. "Timburi" seeds present low germination due to the high degree of seed dormancy. Different methods to overcome seed dormancy was compared: sanding, sanding followed by 24 hours water (25ºC) soaking, imbibition in boiling water followed by exposure to water at room temperature (28ºC), and concentrated sulfuric acid (5, 15, 30, 60, 120 or 180 minutes) followed by washing with tap water. All seeds were germinated in rolled towels at 25ºC and 12 hours photoperiod. Total germination, first count of germination test and germination velocity index were recorded. Mechanical scarification (sanding), chemical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormancy; Forest nursery; Germination; Seed. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000600003 |
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| Alnimr,Amani M.. |
| Dormancy models for Mycobacterium tuberculosis play important roles in understanding various aspects of tuberculosis pathogenesis and in the testing of novel therapeutic regimens. By simulating the latent tuberculosis infection, in which the bacteria exist in a non-replicative state, the models demonstrate reduced susceptibility to antimycobacterial agents. This minireview outlines the models available for simulating latent tuberculosis both in vitro and in several animal species. Additionally, this minireview discusses the advantages and disadvantages of these models for investigating the bacterial subpopulations and susceptibilities to sterilization by various antituberculosis drugs. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormancy; Latency; Tuberculosis; Stationary-phase. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300641 |
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| Borghetti,Fabian; Noda,Fabio Nakamura; Sá,Cezar Martins de. |
| Freshly harvested sunflower seeds (Helianthus annuus L., Asteraceae) present physiological dormancy localized at the embrionary axis which prevents germination at low temperatures. However, dormant embryos reach about 100 % germination when incubated with the phytohormone ethylene during imbibition. To examine whether proteinase activities are implicated in the breaking of dormancy by ethylene, dormant embryos were treated with the proteinase inhibitors leupeptin, E64 and the proteasome specific inhibitor clasto-lactacystin ß-lactone (lactacystin). A few embryos (< 10 %) germinated at 10 ºC in absence of ethylene but ethylene-treated embryos reached high germinability (~90 %) in the presence of leupeptin, E64, water and DMSO. On the other hand,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus; Dormancy; Ethylene; Lactacystin; Proteasome. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000200007 |
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| Zaidan,Lilian B. P.; Carreira,Rosana C.. |
| The aim of this review is to comment on the available data about germination of seeds from herb, shrub and tree species of the Cerrado after the publication of the review written by Felippe and Silva in 1984. Studies on seed germination of herbaceous species focused mainly on the responses of seeds to light, different ranges of temperature and storage in the soil. The majority of seeds from herb species germinate between 20°C and 30°C, and are photoblastic. Alternate temperatures favored germination in some seeds, but changed light sensitivity of the achenes of Bidens gardneri. Seeds of most of the shrub species of Melastomataceae are positive photoblastic; among the Velloziaceae, germination in the dark was observed in some species. Other shrub species... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormancy; Photoblastism; Soil seed bank; Temperature. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300002 |
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| Haider Ali,Hafiz; Tanveer,Asif; Ather Nadeem,Muhammad; Naeem Asghar,Hafiz. |
| Dormancy of weed seeds is a significant feature contributing to their survival rate since it helps the weeds to avoid herbicides and other weeding practices along with unfavorable environmental conditions. We investigated the effects of different dormancy breaking treatments on the germination of Rhynchosia capitata, a common summer annual weed, which is emerging as a weed threat in Pakistan. Seeds were soaked in thiourea, KNO3, HCl, HNO3, and H2SO4, and they were also mechanically scarified (sandpaper). Results indicated that R. capitata seeds show signs of physical dormancy that is mainly due to the impermeability of their coat. Mechanical scarification and acid scarification (soaking of seeds in H2SO4 for 60 and 80 min and in HCl for 12 and 15 h) were... |
| Tipo: Journal article |
Palavras-chave: HCl; HNO3; H2SO4; Dormancy; Germination. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000300021 |
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| Barrueto Cid,L. Pedro; Carvalho,Luiz L.C.B. |
| The conventional technology for in vitro plant conservation for cassava (Manihot esculenta Crantz) germplasm collections is laborious due to the need for several sub-culturing procedures per year. This practice implies high costs for medium preparation, tissue culture tubes, time-consuming labor, risks of contamination, mislabeling of accession, and the need for large growth chambers. We have developed a new procedure using in vitro cultivated nodal axillary buds treated with different abscisic acid (ABA) concentrations to reduce the time for recycling transplants cultivated in a SP basic nutritive medium. Nodal explants were stored for three months with ABA. Plants were obtained after nodal axillary buds were placed in SP medium without ABA. Results... |
| Tipo: Journal article |
Palavras-chave: Tissue culture; Dormancy. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000300011 |
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| Registros recuperados: 94 | |
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