|
|
|
Registros recuperados: 479 | |
|
|
Escalante Vargas, Isaura. |
Las cianobacterias se presentan de manera natural en los arrozales y participan en los ciclos bioquímicos del nitrógeno y carbono. Sin embargo, estudios sobre su diversidad y función en arrozales de México son escasos. Con el objetivo de registrar la riqueza de cianobacterias durante un ciclo reproductivo del cultivo del arroz, se realizaron cuatro recolectas de suelo correspondientes a cada etapa del ciclo fenológico del arroz bajo condiciones de inundación en el ejido La Calavera, Cuautla, Morelos. Se hicieron cultivos en medio agua-suelo y medio BG11 en condiciones estándar. Las especies encontradas pertenecen a los Órdenes Chroococcales, Oscillatoriales y Nostocales, su presencia está asociada a las condiciones del manejo tradicional del cultivo.... |
|
Palavras-chave: Cianobacterias; Arroz; Fertilización nitrogenada; Rice; Nitrogenous fertilization; Edafología; Maestría. |
Ano: 2014 |
URL: http://hdl.handle.net/10521/2286 |
| |
|
|
Ireta Paredes, Arely del Rocío. |
El cultivo del arroz en México ha venido disminuyendo desde 1994 a causa de las importaciones que con la firma del Tratado Trilateral de Libre Comercio se han incrementado por parte de los molineros. A consecuencia de esto, la cadena productiva del arroz en los eslabones de productor y beneficiador se está desarticulando. La presente investigación pretende explicar la competitividad de la cadena del arroz haciendo uso del enfoque “CADIAC”, el cual se basa en metodología de cadenas tomando en cuenta el factor humano, esto es, hace uso del Diálogo entre los actores que integran los eslabones de la cadena (desde la producción del arroz palay hasta la comercialización del arroz pulido); y del consenso entre los actores para definir qué Acciones impulsar para... |
|
Palavras-chave: Arroz; CADIAC; Competitividad; Matriz de análisis de políticas; Rice; Competitiveness; Matrix of analysis of policies; Maestría; Economía. |
Ano: 2010 |
URL: http://hdl.handle.net/10521/97 |
| |
|
|
Ireta Paredes, Arely del Rocío. |
El cultivo del arroz en México ha venido disminuyendo desde 1994 a causa de las importaciones que con la firma del Tratado Trilateral de Libre Comercio se han incrementado por parte de los molineros. A consecuencia de esto, la cadena productiva del arroz en los eslabones de productor y beneficiador se está desarticulando. La presente investigación pretende explicar la competitividad de la cadena del arroz haciendo uso del enfoque “CADIAC”, el cual se basa en metodología de cadenas tomando en cuenta el factor humano, esto es, hace uso del Diálogo entre los actores que integran los eslabones de la cadena (desde la producción del arroz palay hasta la comercialización del arroz pulido); y del consenso entre los actores para definir qué Acciones impulsar para... |
|
Palavras-chave: Arroz; CADIAC; Competitividad; Matriz de análisis de políticas; Rice; Competitiveness; Matrix of analysis of policies; Maestría; Economía. |
Ano: 2010 |
URL: http://hdl.handle.net/10521/97 |
| |
|
|
Dwiartama, Angga; Centre for Sustainability, University of Otago, New Zealand; School of Life Sciences and Technology, Institut Teknologi Bandung, Indonesia; dwiartama@sith.itb.ac.id; Rosin, Christopher; Centre for Sustainability, University of Otago, New Zealand; chris.rosin@otago.ac.nz. |
At first glance, the compatibility of social theory and resilience thinking is not entirely evident, in part because the ontology of the former is rooted in social interactions among human beings rather than ecological process. Despite this difference, resilience thinking engages with particular aspects of social organization that have generated intense debates within social science, namely the role of humans as integral elements of social-ecological systems and the processes through which given social structures (including material relations) are either maintained or transformed. Among social theoretical approaches, Actor-Network Theory (ANT) is noted for its distinctive approach to these aspects. ANT proposes that human and nonhuman components (both... |
Tipo: Peer-Reviewed Insight |
Palavras-chave: Actor-network; Kiwifruit; Nonhuman agency; Relationality; Rice. |
Ano: 2014 |
|
| |
|
|
Kanawapee,Nantawan; Sanitchon,Jirawat; Srihaban,Pranee; Theerakulpisut,Piyada. |
Thirty rice cultivars were evaluated for salinity tolerance during the seedling stage and were divided into five tolerance groups including tolerant (T), moderately tolerant (MT), moderately susceptible (MS), susceptible (S) and highly susceptible (HS) which comprised 5, 10, 9, 4 and 2 cultivars respectively. Genetic diversity of all rice cultivars was evaluated using random amplified polymorphic DNA (RAPD) and simple sequence repeats (SSR) markers. The cultivars were evaluated for polymorphisms after amplification with 20 random decamer primers and 20 SSR primer pairs. A total of 161 RAPD markers and 190 SSR alleles were produced which revealed 68.94% and 89.47% polymorphism respectively. Mean genetic similarity coefficient was 0.82 for RAPD and 0.70 for... |
Tipo: Journal article |
Palavras-chave: Genetic similarity; RAPD markers; Rice; Salinity tolerance; SSR markers. |
Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000600002 |
| |
|
| |
|
| |
|
| |
|
|
Ghneim Herrera,Thaura; Posso Duque,Duina; Pérez Almeida,Iris; Torrealba Núñez,Gelis; Pieters,Alejandro J; Martinez,César P; Tohme,Joe M. |
In Venezuela, pedigree analyses indicate that the rice varieties currently under cultivation are closely related. Effective breeding programs, based on knowledge of the genetic diversity of cultivars, are needed to broaden the genetic bases of rice germplasm in the country. In this study, we used a set of 48 simple-sequence-repeat (SSR) markers to assess the genetic diversity of 11 Venezuelan rice cultivars, released by the National Rice Breeding Program between 1978 and 2007. A total of 203 alleles were detected, the number of alleles (NA) per marker ranged from 2 to 9, with an average of 4.23. The average genic diversity (H) over all SSR loci for the 18 genotypes was 0.524, ranging from 0.105 to 0.815. Positive correlations were found between H at each... |
Tipo: Journal article |
Palavras-chave: DNA fingerprinting; Genetic diversity; Rice; SSR. |
Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000500003 |
| |
|
|
Wang,Xiao-Qiang; Kwon,Soon-Wook; Park,Yong-Jin. |
Background: In order to evaluate the variation among different rice types, the genetic diversity in a rice collection composed by 59 breeding lines, 23 landraces, 18 weedy rice lines, and 35 introduced lines that collected from countries worldwide was analyzed using 134 simple sequence repeat markers. Results: In total, 1264 alleles were identified (average, 9.43 per locus). Rare alleles made up a large portion (58.4%) of the detected alleles, and 29 unique alleles associated with rice accessions were also discovered. A model-based structural analysis revealed the presence of three subpopulations. The genetic relationships revealed by the neighbour-joining tree method were fairly consistent with the structure-based membership assignments for most of the... |
Tipo: Journal article |
Palavras-chave: Landraces; Linkage disequilibrium; Population structure; Rice; Simple sequence repeats. |
Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500011 |
| |
|
|
Gross,Jeferson; Stein,Ricardo José; Fett-Neto,Arthur Germano; Fett,Janette Palma. |
Iron is essential for plants. However, excess iron is toxic, leading to oxidative stress and decreased productivity. Therefore, plants must use finely tuned mechanisms to keep iron homeostasis in each of their organs, tissues, cells and organelles. A few of the genes involved in iron homeostasis in plants have been identified recently, and we used some of their protein sequences as queries to look for corresponding genes in the rice (Oryza sativa) genome. We have assigned possible functions to thirty-nine new rice genes. Together with four previously reported sequences, we analyzed a total of forty-three genes belonging to five known protein families: eighteen YS (Yellow Stripe), two FRO (Fe3+-chelate reductase oxidase), thirteen ZIP (Zinc regulated... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Iron; Rice; Genome analysis; Iron transporters; Ferritin. |
Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400012 |
| |
|
|
Menguer,Paloma Koprovski; Sperotto,Raul Antonio; Ricachenevsky,Felipe Klein. |
Abstract Oryza sativa, the common cultivated rice, is one of the most important crops for human consumption, but production is increasingly threatened by abiotic stresses. Although many efforts have resulted in breeding rice cultivars that are relatively tolerant to their local environments, climate changes and population increase are expected to soon call for new, fast generation of stress tolerant rice germplasm, and current within-species rice diversity might not be enough to overcome such needs. The Oryza genus contains other 23 wild species, with only Oryza glaberrima being also domesticated. Rice domestication was performed with a narrow genetic diversity, and the other Oryza species are a virtually untapped genetic resource for rice stress tolerance... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza; Rice; Wild species; Abiotic stress; Domestication. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000200238 |
| |
|
| |
|
|
Sandhu,S.S.; Colombo,Carlos; Bastos,Cândido R.; Siqueira,Walter J.. |
Rice blast is the most important fungal disease of rice and is caused by Pyricularia oryzae Sacc. (Telomorph Magnoporthe grisea Barr.). Seven randomly amplified polymorphic DNA (RAPD) markers OPA5, OPG17, OPG18, OPG19, OPF9, OPF17 and OPF19 showed very clear polymorphism in resistant cultivar lines which differed from susceptible lines. By comparing different susceptible lines, nine DNA amplifications of seven primers (OPA5(1000), OPA5(1200,) OPG17(700), OPG18(850), OPG19(500), OPG19(600), OPF9(600), OPF17(1200) and OPF19(600)) were identified as dominant markers for the blast resistant gene in resistant cultivar lines. These loci facilitate the indirect scoring of blast resistant and blast susceptible genotypes. The codomine RAPDs markers will facilitate... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rice; SCAR; Arbitrary primers; Pyricularia oryzae. |
Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400011 |
| |
|
|
Xing,Shaochen; Cai,Yuhong; Zhou,Kaida. |
A triploid (2n = 3x = 36) rice plant was obtained by screening a twin seedling population in which each seed germinated to two or three sprouts that were then crossed with diploid plants. One diploid plant was chosen among the various F1 progenies and developed into an F2 population via self-pollination. Compared with the control variety Shanyou 63, this F2 population had a stable agronomical performance in field trials, as confirmed by the F-test. The stability of the F2 population was further substantiated by molecular analysis with simple sequence repeat markers. Specifically, of 160 markers assayed, 37 (covering all 12 chromosomes) were polymorphic between the parental lines. Testing the F1 hybrid individually with these markers showed that each PCR... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: F-test; Polyploidy; Rice; SSR marker; Stability. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200020 |
| |
|
|
Zhu,Keming; Tao,Huimin; Xu,Shuo; Li,Kaixia; Zafar,Sundus; Cao,Wei; Yang,Yanhua. |
Abstract Senescence, a highly programmed process, largely determines yield and quality of crops. However, knowledge about the onset and progression of leaf senescence in crop plants is still limited. Here, we report that salt-induced protein (salT), a new gene, may be involved in leaf senescence. Overexpressing salT could prolong the duration of leaves with higher concentrations of chlorophyll compared with the wild type. Moreover, overexpression of salT could delay the senescence of rice leaves though the inhibition of senescence associated genes (SAGs). Overall, the characterization of salT suggested that it is a new gene affecting the leaf senescence induced by natural and dark conditions. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf senescence; Salt-induced protein (salT); Rice; Stay-green. |
Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100080 |
| |
|
|
Hwang,Jung Eun; Hwang,Sun-Goo; Jung,In Jung; Han,Sung Min; Ahn,Joon-Woo; Kim,Jin-Baek. |
Abstract Ionizing radiation has a substantial effect on physiological and biochemical processes in plants via induction of transcriptional changes and diverse genetic alterations. Previous microarray analysis showed that rice OsFBX322, which encodes a rice F-box protein, was downregulated in response to three types of ionizing radiation: gamma irradiation, ion beams, and cosmic rays. In order to characterize the radiation-responsive genes in rice, OsFBX322 was selected for further analysis. OsFBX322 expression patterns in response to radiation were confirmed using quantitative RT-PCR. Transient expression of a GFP-OsFBX322 fusion protein in tobacco leaf epidermis indicated that OsFBX322 is localized to the nucleus. To determine the effect of OsFBX322... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: F-box protein; Gamma-irradiation; Ionizing radiation; Rice; Transgenic plant. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000100304 |
| |
|
|
Alvarez,Alba; Fuentes,Jorge Luis; Puldón,Violeta; Gómez,Pedro Julio; Mora,Leonor; Duque,Miriam C.; Gallego,Gerardo; Tohme,Joe M.. |
Microsatellite polymorphism was studied in a sample of 39 traditional rice (Oryza sativa L.) varieties and 11 improved varieties widely planted in Cuba. The study was aimed at assessing the extent of genetic variation in traditional and improved varieties and to establish their genetic relationship for breeding purposes. Heterozygosity was analyzed at each microsatellite loci and for each genotype using 10 microsatellite primer pairs. Between varieties genetic relationship was estimated. The number of alleles per microsatellite loci was 4 to 8, averaging 6.6 alleles per locus. Higher heterozygosity (H) was found in traditional varieties (H TV = 0.72) than in improved varieties (H IV = 0.42), and 68% of the total microsatellite alleles were found... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic diversity; Microsatellite; Rice; Traditional germplasm. |
Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600014 |
| |
|
| |
Registros recuperados: 479 | |
|
|
|