Consulta: subjectFacets:"Desiccation tolerance"
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Data/hora: 13/06/2024 04:52:53

Reversible in vivo cellular changes occur during desiccation and recovery: Desiccation tolerance of the resurrection filmy fern Hymenophyllum dentatum Cav.
Provedor de dados: Gayana Botánica
Autores: Bravo,Soraya; Parra,María José; Castillo,Rosario; Sepúlveda,Francisco; Turner,Aileen; Bertín,Ariana; Osorio,Germán; Tereszczuk,Joanna; Bruna,Carola; Hasbún,Rodrigo.
ABSTRACT The present work explores in vivo physiological, morphological and chemical features during full hydration, desiccation and rehydration of the filmy fern Hymenophyllum dentatum with two main objectives: 1) to get further insight about the mechanisms underlying its desiccation tolerance, and 2) to understand how this plant manages mechanical stress induced by water loss and recovery. With these purposes, physiological (relative water content and F /F chlorophyll fluorescence parameter), morphological (Confocal Laser Scanning Microscopy and 3D reconstruction) and chemical (FT- IR microspectroscopy) data were obtained and compared between fully hydrated, desiccated and rehydrated tissues of H. dentatum. Remarkable changes in cell architecture and...
Tipo: Journal article
Palavras-chave: Hymenophyllum; Desiccation tolerance; Confocal 3D microscopy; FT-IR microspectroscopy; Rapid dehydration/rehydration.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432016000200402

Comparative transcriptome profile of the leaf elongation zone of wild barley (Hordeum spontaneum) eibi1 mutant and its isogenic wild type
Provedor de dados: Genetics and Molecular Biology
Autores: Zhou,Qin; Wang,Aidong; Duan,Ruijun; Yan,Jun; Zhao,Gang; Nevo,Eviatar; Chen,Guoxiong.
Abstract The naturally occurring wild barley mutant eibi1/hvabcg31 suffers from severe water loss due to the permeable leaf cuticle. Eibi1/HvABCG31 encodes a full ATP-binding cassette (ABC) transporter, HvABCG31, playing a role in cutin deposition in the elongation zone of growing barley leaves. The eibi1 allele has pleiotropic effects on the appearance of leaves, plant stature, fertility, spike and grain size, and rate of germination. Comparative transcriptome profile of the leaf elongation zone of the eibi1 mutant as well as its isogenic wild type showed that various pathogenesis-related genes were up-regulated in the eibi1 mutant. The known cuticle-related genes that we analyzed did not show significant expression difference between the mutant and wild...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ABC transporter; Defense genes; Desiccation tolerance; Plant cuticle; RNA-Seq.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000500834

Desiccation effects on germination and vigor of King palm seeds
Provedor de dados: Horticultura Brasileira
Autores: Martins,Cibele C.; Bovi,Marilene L. A.; Nakagawa,João.
The desiccation tolerance of Archontophoenix alexandrae (Wendl. &amp;amp; Drude) seeds was determined and the most sensitive vigor test for assessing seed deterioration of this species was identified. Mature fruits were harvested in the palm collection of the Instituto Agronomico in Campinas, Brazil. Depulped fruits were transported in impermeable packages to the Faculdade de Agronomia in Botucatu, where the seeds were dried. As the seed moisture decreased, germination, seedling length, electrical conductivity and moisture were measured. The seeds of A. alexandrae are recalcitrant, with high germination percentage (over 67%) when undried (47% seed moisture). Lowering seed moisture below 31.5% reduced the germination rate significantly (&lt;52.5%). Total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Archontophoenix alexandrae; Alexandra palm; Seed deterioration; Electrical conductivity; Recalcitrance; Desiccation tolerance; Critical moisture; Lethal moisture.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362003000100019

Changes in gene expression during drying and imbibition of desiccation sensitive Magnolia ovata (A. St.-Hil.) spreng. seeds
Provedor de dados: Revista Brasileira de Sementes
Autores: José,Anderson C.; Ligterink,Wilco; Davide,Antonio Claudio; Silva,Edvaldo A. Amaral da; Hilhorst,Henk W.M.
Seeds of Magnolia ovata were dried to different water contents to assess the viability and transcript abundance of genes related to seed development, cell cycle, cytoskeleton and desiccation tolerance.The expression of development, cell cycle and cytoskeleton relative genes (ABI3, CDC2-like and ACT2) alone could not explain the germination behaviour of M. ovata seeds in relation to drying damage. Irrespective of their initial water content, the seeds performed in the same way during the initial period of germination and the deleterious effects of desiccation only occurred in later stages. Expression of PKABA1, sHSP17.5 and 2-Cys-PRX did not show a relationship with desiccation. However, the expression patterns of PKABA1 and sHSP17.5 suggested the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Desiccation tolerance; Drying; Gene expression; Magnolia ovata.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222009000100030

Evolution of research on recalcitrant seeds
Provedor de dados: Scientia Agricola
Autores: Barbedo,C.J.; Bilia,D.A.C.
Some comments about seeds that show sensitivity to desiccation and short viability period, called recalcitrants, were made. Further studies showed that there was a gradient of sensitivity to desiccation and an intermediate class was proposed. The research demonstrated different factors related to desiccation tolerance such as ABA, proteins and sugars. It was analyzed the research of recalcitrant seeds in Brazil, that started around 1950 and nowadays the major aspects studied are recalcitrant seeds identification, seed low temperature and drying tolerance, storage capacity under different rooms and packages, chemical composition and viability during storage, fungicide treatment efficiency on seed conservation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seed; Recalcitrant; Desiccation tolerance; Brazil.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500022

The influence of moisture on the in vitro embryo germination and morphogenesis of babassu (Orbignya phalerata Mart.) - doi: 10.4025/actasciagron.v34i4.13429
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Silva, Marcus Vinícius Vieira da; Instituto Federal Goiano; Sales, Juliana de Fátima; Instituto Federal Goiano; Silva, Fabiano Guimarães; Instituto Federal Goiano; Neto, Aurélio Rubio; Instituto Federal Goiano; Alberto, Paula Sperotto; Instituto Federal Goiano; Pereira, Flávia Dionísio; IFGoiano - Campus Rio Verde.
The objective of this study was to evaluate the physiological quality of babassu (Orbignya phalerata Mart.) embryos as a function of desiccation. The fruits were placed in a convection oven at 37±2°C for 0, 3, 6, 9, or 12 days. After these periods, the moisture contents of the fruits and seeds were determined. A reduction in the water content occurred more rapidly in the fruits than in the seeds. The decrease in seed moisture content from 12.59% (on the basis of fresh weight) to 4.56% did not affect the percentage of germinated zygotic embryos; however, we did observe a decline in the vigor as the seed moisture content decreased. Embryos with a 4.56% moisture content developed into seedlings of shorter lengths after 30, 60, and 90 days of in vitro growth....
Tipo: Pesquisa Empírica
Palavras-chave: 5.01.03.00-8 Arecaceae; Desiccation tolerance; Tissue culture; Fitotecnia.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/13429

Protein expression upon desiccation and imbibition of Magnolia ovata A. St.-Hil seeds
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: José,Anderson Cleiton; Silva,Edvaldo Aparecido Amaral da; Davide,Antonio Claudio; Toorop,Peter.
The effect of seed drying and imbibition was studied by differential protein expression using two dimensional gel electrophoresis. After drying to a range of water contents, seeds were germinated to assess the viability. Seeds of Magnolia ovata did not withstand the desiccation down to 0.10 g H2O · g-1 dw. The critical water content below which the desiccation sensitivity became apparent was around 0.18 g H2O · g-1 dw (-26.5 MPa). Total protein was extracted and separated by 2D electrophoresis from fresh seeds (0.28 g H2O · g-1 dw), mild dried seeds (0.25 g H2O · g-1 dw) and seeds at low water content (0.10 g H2O · g-1 dw) before and after imbibition for 10 days. The proteome profile revealed the presence of 588 spots on each silver stained gel, from which...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Desiccation tolerance; Forest seed; Legumin; Proteomics.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000300006

Water potential and viability of seeds of Eugenia (Myrtaceae), a tropical tree species, based upon different levels of drying
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Delgado,Liliana Ferreira; Barbedo,Claudio José.
The aim of the present work was to study the water potential and viability of Eugenia based upon different levels of drying. The seeds showed high water content at shedding and were sensitive to desiccation; however, the level of this sensitivity (water content) varied among the species. Five target drying levels were defined according to the critical levels of hydration. Results showed that water potential seemed to be more reliable than water content. It was hypothesize that the differences in desiccation tolerance, as well as recalcitrance, among the seeds of different species could be related to the maturity level of these seeds during shedding from the mother plant. Consequently, this could be a result of the evolution on how far the maturation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Desiccation tolerance; Drying; Seed water relations; Recalcitrance.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000400014

Reserve carbohydrates and lipids from the seeds of four tropical tree species with different sensitivity to desiccation
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Mello,Juliana Iura de Oliveira; Barbedo,Claudio José; Salatino,Antonio; Figueiredo-Ribeiro,Rita de Cássia Leone.
Considering the importance of water content for the conservation and storage of seeds, and the involvement of soluble carbohydrates and lipids for embryo development, a comparative study was carried out among the seeds of Inga vera (ingá), Eugenia uniflora (pitanga), both classified as recalcitrant, and Caesalpinia echinata (brazilwood) and Erythrina speciosa (mulungu), considered as orthodox seeds. Low concentrations of cyclitols (0.3-0.5%), raffinose family oligosaccharides (ca. 0.05%) and unsaturated fatty acids (0-19%) were found in the seeds of ingá and pitanga, while larger amounts of cyclitols (2-3%) and raffinose (4.6-13%) were found in brazilwood and mulungu, respectively. These results, in addition to higher proportions of unsaturated fatty acids...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Desiccation tolerance; Fatty acids; Seeds; Starch; Sugars.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000400019

Ecophysiology of coconut palm under water stress
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Gomes,Fábio P.; Prado,Carlos H.B.A.
Coconut palm is of great social and economic importance for millions of people in the tropics and subtropics. Drought is one of the main environmental factors that limit coconut productivity. In this review, physiological and morphological data are presented in an integrated perspective to provide a holistic view of the behavior of coconut trees facing water deficit under both field and controlled conditions. Great capacity to produce homorhizic roots capable of searching continuously for water and nutrients and high protoplasmic tolerance in leaves allows the coconut tree to endure water deficit. High membrane stability, osmoprotection, osmoregulation and enhanced activity of antioxidant enzymes are characteristics often found in leaves of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cocus nucifera; Desiccation tolerance; Leaf gas exchange; Leaf water relations; Net photosynthesis; Osmotic potential; Water potential; Water-use efficiency.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400008

Effects of different drying rates on the physiological quality of Coffea canephora Pierre seeds
Provedor de dados: Brazilian Journal of Plant Physiology
Autores: Rosa,Sttela Dellyzete Veiga Franco da; Brandão Júnior,Delacyr da Silva; Von Pinho,Édila Vilela de Resende; Veiga,André Delly; Silva,Luiz Hildebrando de Castro e.
Desiccation tolerance in seeds depends on the species, development stage and drying conditions, especially the water removal rate. Coffea seeds are considered of intermediate performance, because they tolerate relative dehydration compared to orthodox seeds and are sensitive to low temperatures. The objective of this study was to verify the effect of different drying rates on the viability and storability of Coffea canephora seeds. A complete randomized experimental design was used, in a factorial 3 x 5 x 2 design, with three drying rates (fast, intermediate and slow), five final mean water contents after drying (51, 42, 33, 22 and 15 %) and two storage temperatures (10 and 20°C). The germination and seed vigor assessments, using radicle protrusion,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffee tree; Desiccation tolerance; Seeds; Seed storage.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200002