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| Registros recuperados: 17 | |
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| Day-Rubenstein, Kelly A.; Heisey, Paul W.; Shoemaker, Robbin A.; Sullivan, John; Frisvold, George B.. |
| Crop genetic resources are the basis of agricultural production, and significant economic benefits have resulted from their conservation and use. However, crop genetic resources are largely public goods, so private incentives for genetic resource conservation may fall short of achieving public objectives. Within the U.S. germplasm system, certain crop collections lack sufficient diversity to reduce vulnerability to pests and diseases. Many such genetic resources lie outside the United States. This report examines the role of genetic resources, genetic diversity, and efforts to value genetic resources. The report also evaluates economic and institutional factors influencing the flow of genetic resources, including international agreements, and their... |
| Tipo: Report |
Palavras-chave: Genetic resources; Genetic diversity; Germplasm; R&D; International transfer of genetic resources; In situ conservation; Ex situ conservation; Gene banks; Intellectual property.; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies. |
| Ano: 2005 |
URL: http://purl.umn.edu/59388 |
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| Pinto,Maísa de Siqueira; Paiva,Renato; Silva,Diogo Pedrosa Corrêa da; Santos,Paulo Augusto Almeida; Freitas,Rodrigo Therezan de; Silva,Luciano Coutinho. |
| ABSTRACT Conservation of plant genetic resources is important to prevent genetic erosion. Seed banks are the most common method of ex situ conservation; however, coffee seeds can not be stored by conventional methods. Cryopreservation is a viable alternative for long-term conservation of species that produce intermediate or recalcitrant seeds, as coffee. The aim of this work was to cryopreserve Coffea arabica L. cv Catuaí Vermelho IAC 144 zygotic embryos, and analyse the effects of dehydration prior cryopreservation and osmotic rehydration after thawing, in embryos germination and seedlings formation after cryopreservation. Prior to cryopreservation, different dehydration times (0, 15, 30, 60 and 120 min) were tested. Dehydrated embryos were cryopreserved... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica L; Ex situ conservation; Embryos dehydration; Long-term storage; Gene bank. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000400380 |
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| Lédo,Ana da Silva; Jenderek,Maria; Skogerboe,Dianne; Staats,Elise; Machado,Caroline de Araújo; Oliveira,Leila Albuquerque Resende de. |
| Abstract: The objective of this work was to evaluate rewarming procedures and recovery media for Brazilian Green Dwarf coconut (Cocos nucifera) embryos cryopreserved by vitrification. The rewarming procedures evaluated were: T1, water bath at 38±2°C; and T2, unloading solution consisting of Y3 medium + 1.2 mol L-1 sucrose. The recovery media assessed were: M1, Y3 medium + 45 g L-1 sucrose + 1 mg L-1 gibberellic acid + 1 g L-1 activated charcoal + 2.2 g L-1 Gelrite; and M2, Y3 medium + 60 g L-1 sucrose + 2.2 g L-1 Gelrite. Rewarming procedures showed no significant effect, and the M1 media induced 72.5% regeneration. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cocos nucifera; Ex situ conservation; PVS3. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400514 |
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| Batista, Camila Moreira; Freitas, Miguel Luiz Menezes; Moraes, Marcela Aparecida de; Zanatto, Antonio Carlos Scatena; Santos, Pedro César dos; Zanata, Marcelo; Moraes, Mario Luiz Teixeira de; Sebbenn, Alexandre Magno. |
| The present study aimed at estimating genetic parameters and variability among and within provenances for silvicultural traits of Handroanthus vellosoi (Toledo) Mattos, in provenances and progenies test stands, located at the Luiz Antônio Experimental Station (São Paulo State, Brazil). The test was established in the compact family block design, with two provenances (allocated in the plots), six replicates and sub-linear plots of five plants, totalizing 35 progenies. Diameter at breast height (DBH), plant height, cylindrical volume, stem form and survival at 24 years of age were evaluated. Significant differences among the provenances were observed only to the trait stem form. The analysis of deviance showed significant differences among progenies for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ex situ conservation; Tropical tree species; Population genetics; Quantitative genetics Recursos genéticos florestais; Conservação genética; Genética de populações; Genética quantitativa; Melhoramento genético florestal Conservação ex situ; Espécies arbóreas tropicais; Genética de populações; Genética quantitativa. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/358 |
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| Gomes,Hugo Teixeira; Bartos,Patrícia Monah Cunha; Andrade,Maíra Teixeira de; Almeida,Raphael Ferreira; Lacerda,Luciana Florencio de; Scherwinski-Pereira,Jonny Everson. |
| Abstract: The objective of this work was to evaluate the micropropagation of blackberry (Rubus spp.) cultivars, after in vitro conservation under minimal growth conditions. Nodal segments of the 'Guarani', 'Caingangue', 'Ébano', and 'Xavante' genotypes were conserved under minimal growth conditions at 20ºC, for 15 months. Microshoots were regenerated and multiplied by up to five successive subcultures, when they were rooted and acclimatized. After 30 days of acclimatization in a greenhouse, rooted plantlets showed no significant losses. Blackberry cultivars can be conserved in vitro for 15 months, without subcultures and, after this time, they can be micropropagated on a large-scale, maintaining the regenerative potential and multiplication. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rubus; Ex situ conservation; Plant genetic resources; Plant propagation; Slow-growth. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201286 |
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| Rezende,Renata Alves Lara Silva; Rodrigues,Filipe Almendagna; Rezende,Ramiro Machado; Soares,Joyce Dória Rodrigues; Pasqual,Moacir; Assis,Franscinely Aparecida de. |
| Abstract: The objective of this work was to evaluate the effects of temperature and osmotic agents on the in vitro conservation of Cape gooseberry (Physalis peruviana). Temperatures at 18 and 25°C, as well as the osmotic agents sucrose, mannitol, and sorbitol were tested. A short-term in vitro conservation of Cape gooseberry can be achieved at 18°C, using 30 g L-1 sucrose. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Physalis peruviana; Ex situ conservation; Tissue culture.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000500651 |
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| Silva,Tatiane Loureiro da; Scherwinski-Pereira,Jonny Everson. |
| The objective of this work was to evaluate in vitro storage of Piper aduncum and P. hispidinervum under slow-growth conditions. Shoots were stored at low temperatures (10, 20 and 25°C), and the culture medium was supplemented with osmotic agents (sucrose and mannitol - at 1, 2 and 3%) and abiscisic acid - ABA (0, 0.5, 1.0, 2.0 and 3.0 mg L-1). After six-months of storage, shoots were evaluated for survival and regrowth. Low temperature at 20ºC was effective for the in vitro conservation of P. aduncum and P. hispidinervum shoots. In vitro cultures maintained at 20ºC on MS medium showed 100% survival with slow-growth shoots. The presence of mannitol or ABA, in the culture medium, negatively affected shoot growth, which is evidenced by the low rate of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ex situ conservation; Germplasm bank; Micropropagation. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000400007 |
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| Rodrigues,Maria Gabriela Fontanetti; Santos,Tatiane Paes dos; Ferreira,Antonio Flávio Arruda; Monteiro,Laís Naiara Honorato; Nakanishi,Eduarda Sayuri; Boliani,Aparecida Conceição. |
| Abstract Fig tree (Ficus carica L.) is a fruit of great importance worldwide, being able to be implanted as new source of agricultural variability. The aim of the present work was to characterize the active germplasm bank of fig trees by means of morphological descriptors of 45 fig accessions at the Faculty of Agrarian and Technological Sciences, Campus of Dracena, FCAT / UNESP aiming at the recognition of the quality and genetic variability potential of the species. Thus, their biometric characteristics were evaluated by qualitative and quantitative descriptors of leaves and fruits. Fig tree accessions were characterized by means of the morphological characteristics of leaves and fruits, identifying AGB with high phenotypic variability and well adapted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ficus carica L.; Ex situ conservation; Genetic resources; Biometrics. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452019000500802 |
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| Vendrame,Wagner; Faria,Ricardo Tadeu de; Sorace,Mauren; Sahyun,Sandra Aparecida. |
| Orchids are lush and highly valuable plants due to their diversity and the beauty of their flowers, which increases their commercialization. The family Orchidaceae comprises approximately 35,000 species, distributed among more than 1,000 distinct genera and 100,000 hybrids, totaling approximately 8% to 10% of all flowering plants. With the advance of agriculture and the constant destruction of their natural habitat, orchid species are collected in an indiscriminate manner by collectors and vendors, and this extractive activity threatens many species with extinction, drastically reducing their genetic variability in nature. Therefore, it is essential to seek alternatives that make the preservation of such species feasible using techniques with low... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Preservation; Orchidaceae; Ex situ conservation; Freezing tolerance; Extinction. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000300001 |
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| Salomão,Antonieta Nassif. |
| The ability to tolerate ultra-low temperature (-196 ºC) exposure was evaluated in 66 tropical orthodox seed species of 21 botanical families from the Cerrado (Brazilian Savannah) and Atlantic Forest Brazilian biomes. Liquid nitrogen had no effect on the germinability of 51 seed species. The stimulatory effect of cryogenic temperature on germinability, with or without subsequent chemical scarification, was observed in nine seed species with deep physical dormancy, or heterogeneous levels of seed hardness, or with no dormancy. Significant reduction in germinability occurred in six seed species, presumably because of factors acting individually or in combination on these seeds, such as inappropriate moisture content, or the potentially detrimental effect of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cryopreservation; Ex situ conservation; Seed dormancy. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000200008 |
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| Registros recuperados: 17 | |
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