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Search Results: 1 - 10 of 4629 matches for " Cinara;Cavalli-Molina "
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Fitotoxicidade do alumínio: efeitos, mecanismo de tolerancia e seu controle genético
Echart, Cinara Lima;Cavalli-Molina, Suzana;
Ciência Rural , 2001, DOI: 10.1590/S0103-84782001000300030
Abstract: acid soils and associated mineral toxicity are a great restriction for crop production, and among the metals, aluminum is considered one of the most important problems in soils with ph £ 5.0. breeding for aluminum tolerance is considered a useful way to improve important economic plants' performance in acid soils with high concentration of this metal, as those which occur in south brazil. however, for this, it is necessary to identify aluminum-tolerant genotypes, to understand aluminum phytotoxicity and tolerance mechanisms, and to know genetic control of this tolerance. this paper presents a review of these subjects, with emphasis on aluminum forms present in soils, their effect over the plants, the stage of knowledge on aluminum tolerance mechanisms and their genetic control in different cereal groups.
Fitotoxicidade do alumínio: efeitos, mecanismo de tolerancia e seu controle genético
Echart Cinara Lima,Cavalli-Molina Suzana
Ciência Rural , 2001,
Abstract: Solos ácidos associados a metais tóxicos s o uma das maiores restri es à produ o agrícola e, entre os metais, o alumínio destaca-se como um dos maiores problemas em solos com pH £ 5,0. O melhoramento para tolerancia ao alumínio é considerado um excelente caminho para aumentar o desempenho de plantas economicamente importantes cultivadas em solos ácidos ricos nesse metal, como os que ocorrem no sul do Brasil. Para isso, é necessário identificar, entre os diferentes cultivares, aqueles que apresentam mecanismos de tolerancia, compreender como esses cultivares agem em sua presen a, bem como conhecer o controle genético da tolerancia ao alumínio. Este trabalho apresenta uma revis o sobre o assunto, abordando as formas de alumínio presentes no solo, seu efeito sobre as plantas, os mecanismos de tolerancia e o controle genético desta tolerancia em diferentes grupos de cereais.
Hordein variation in Brazilian barley varieties (Hordeum vulgare L.) and wild barley (H. euclaston Steud. and H. stenostachys Godr.)
Echart-Almeida, Cinara;Cavalli-Molina, Suzana;
Genetics and Molecular Biology , 2000, DOI: 10.1590/S1415-47572000000200031
Abstract: sds-page was used to analyze the hordein polypeptide patterns of brazilian barley varieties (hordeum vulgare l.) and of two native species of hordeum from southern brazil (h. euclaston steud. and h. stenostachys godr.). forty different hordein polypeptide bands with molecular weights ranging from 30 to 94 kda were found in the seeds of the three species studied. twelve of the 14 varieties examined showed intravarietal polymorphism. the number of bands ranged from 10 to 17, depending on the variety, and from 3 to 13 among individual seeds, with a total of 26 bands in h. vulgare. phenograms using each seed as an operational taxonomic unit (otu) showed that the seeds from most varieties did not form distinct clusters. seeds from different plants of the native species varied considerably. the molecular weights of the hordein polypeptides of the two native species were quite different from those of h. vulgare. there was a greater similarity between the native species than with h. vulgare, although h. stenostachys was slightly closer to the cultivated species than h. euclaston.
Hordein polypeptide patterns in relation to malting quality in Brazilian barley varieties
Echart-Almeida, Cinara;Cavalli-Molina, Suzana;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000200001
Abstract: since there is evidence that malting quality is related to the storage protein (hordein) fraction, in the present work the hordein polypeptide patterns from 13 barley (hordeum vulgare l.) varieties of different malting quality were analysed in order to explore the feasibility of using hordein electrophoresis to assist in the selection of malting barleys. the formation of clusters separating the varieties with higher malting quality from the others with lower quality suggests that there is a relationship between the general hordein polypeptide pattern and malting quality in the varieties analysed. by the sperman's correlation test three hordein bands correlated negatively with malting quality in the germplasm studied.
Hordein variation in Brazilian barley varieties (Hordeum vulgare L.) and wild barley (H. euclaston Steud. and H. stenostachys Godr.)
Echart-Almeida Cinara,Cavalli-Molina Suzana
Genetics and Molecular Biology , 2000,
Abstract: SDS-PAGE was used to analyze the hordein polypeptide patterns of Brazilian barley varieties (Hordeum vulgare L.) and of two native species of Hordeum from southern Brazil (H. euclaston Steud. and H. stenostachys Godr.). Forty different hordein polypeptide bands with molecular weights ranging from 30 to 94 kDa were found in the seeds of the three species studied. Twelve of the 14 varieties examined showed intravarietal polymorphism. The number of bands ranged from 10 to 17, depending on the variety, and from 3 to 13 among individual seeds, with a total of 26 bands in H. vulgare. Phenograms using each seed as an operational taxonomic unit (OTU) showed that the seeds from most varieties did not form distinct clusters. Seeds from different plants of the native species varied considerably. The molecular weights of the hordein polypeptides of the two native species were quite different from those of H. vulgare. There was a greater similarity between the native species than with H. vulgare, although H. stenostachys was slightly closer to the cultivated species than H. euclaston.
Hordein polypeptide patterns in relation to malting quality in Brazilian barley varieties
Echart-Almeida Cinara,Cavalli-Molina Suzana
Pesquisa Agropecuária Brasileira , 2001,
Abstract: Since there is evidence that malting quality is related to the storage protein (hordein) fraction, in the present work the hordein polypeptide patterns from 13 barley (Hordeum vulgare L.) varieties of different malting quality were analysed in order to explore the feasibility of using hordein electrophoresis to assist in the selection of malting barleys. The formation of clusters separating the varieties with higher malting quality from the others with lower quality suggests that there is a relationship between the general hordein polypeptide pattern and malting quality in the varieties analysed. By the Sperman's correlation test three hordein bands correlated negatively with malting quality in the germplasm studied.
Variabilidade isoenzimática em progênies de biótipos apomíticos de Paspalum dilatatum (Poaceae)
Gauer, Luciane;Albarus, Maria Helena;Cavalli-Molina, Suzana;
Ciência Rural , 2001, DOI: 10.1590/S0103-84782001000500010
Abstract: paspalumdilatatum is a plant species of high forage value with a wide range of biotypes, with sexual and apomictic types. purple-anthered and torres biotypes are described as apomictic based only on cytological analysis of embrionary sac. the present research aimed at analyzing the occurrence of variability among sib seedlings and endosperms of these biotypes through gel electrophoresis. enzymatic systems of got, idh, me, pgm, and sod were not informative because they did not show intra-specific or intra-biotype polymorphism. amy revealed large isoenzymatic variation among endosperms from the same strain but without variation among sib seedlings. this could suggest occurrence of pseudogamy. however, for mdh and per, the occurrence of variability among sib seedlings was observed, which can be indicative of genic segregation and suggests the occurrence of sexual reproduction.
Variabilidade isoenzimática em progênies de biótipos apomíticos de Paspalum dilatatum (Poaceae)
Gauer Luciane,Albarus Maria Helena,Cavalli-Molina Suzana
Ciência Rural , 2001,
Abstract: Paspalum dilatatum, espécie de alto valor forrageiro, apresenta uma ampla variedade de biótipos, tendo formas sexuais e apomíticas. Os biótipos P. dilatatum anteras roxas e Torres s o descritos como tendo reprodu o assexual por apomixia, conclus o esta baseada apenas em análises citológicas do saco embrionário. O presente trabalho teve como objetivo confirmar o modo de reprodu o destes dois biótipos, analisando a ocorrência de variabilidade entre plantulas-irm s e entre endospermas, através de eletroforese de isoenzimas. Os sistemas de IDH, ME, PGM, SOD e GOT n o foram informativos por n o apresentarem polimorfismo intra-específico ou dentro de cada biótipo. Para o sistema das AMI, observou-se grande varia o isoenzimática entre os endospermas de sementes de uma mesma linhagem, com ausência de varia o entre as plantulas-irm s, o que poderia sugerir a ocorrência de pseudogamia. Entretanto, para os sistemas das MDH e PER foi observado a ocorrência de variabilidade na progênie de plantas individuais, o que pode ser indicativo de segrega o gênica e sugerir a ocorrência de reprodu o sexual.
Isoenzyme variation in the leaf-cutting ants Acromyrmex heyeri and Acromyrmex striatus (Hymenoptera, formicidae)
Diehl, Elena;Cavalli-Molina, Suzana;Araújo, Aldo Mellender de;
Genetics and Molecular Biology , 2002, DOI: 10.1590/S1415-47572002000200010
Abstract: this is the first study of isoenzyme variability in the leaf-cutting ants (myrmicinae, attini) acromyrmex heyeri (forel, 1899) and a. striatus (roger, 1863) which are common throughout the southern brazilian state of rio grande do sul. we studied the alloenzyme variability of malate dehydrogenase (mdh), a-glycerophosphate dehydrogenase (a-gpdh) and amylase (amy) in 97 colonies of a. heyeri and 103 colonies of a. striatus. five loci were found for these enzyme systems, one locus (amy-1) being monomorphic in both species and four loci (mdh-1, a-gpdh-1, amy-2, and amy-4) being polymorphic. for each species there were exclusive alleles for the mdh-1 and amy-2 loci and differences were also found in the allele frequencies for the other polymorphic loci. ontogenetically different gene activity was detected for the mdh and a-gpdh systems, with between-caste differences, probably related to flight activity, also being found for a-gpdh.
Genetic variability and social structure of colonies in Acromyrmex heyeri and A. striatus (Hymenoptera: Formicidae)
DIEHI, E.;ARAúJO, A. M. de;CAVALLI-MOLINA, S.;
Brazilian Journal of Biology , 2001, DOI: 10.1590/S1519-69842001000400017
Abstract: the breeding structure of both colony and population of social insects can be examined by genetic analysis. colonies of the leaf-cutting ants acromyrmex heyeri and a. striatus (myrmicinae, attini) were thus analyzed for isoenzyme systems mdh, a-gpdh, and amy to describe genotype variability and social structure. a total of five loci were investigated (three for amylase and one for each other system). ninety-seven colonies of a. heyeri and 103 of a. striatus were sampled in different localities in southern brazil (state of rio grande do sul). the genotypes found show the occurrence of monogyny and polygyny associated or not with polyandry, which indicates that the social organization is colony-specific. the polygyny and polyandry observed are likely to be responsible for the great genotypic diversity of the colonies. the average inbreeding coefficient per colony was higher in a. striatus than in a. heyeri, which may reflect the different patterns of production of sexual individuals and nuptial flight of those two species.
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