A macieira necessita de estímulo do frio para a queda das folhas ao final do ciclo, à dormência h... more A macieira necessita de estímulo do frio para a queda das folhas ao final do ciclo, à dormência hibernal e a sua quebra desta. A não ocorrência adequada de frio no período do inverno resulta em brotação e florescimento irregular, resultando em desenvolvimento vegetativo e reprodutivo deficientes. Os objetivos deste trabalho foram de caracterizar indivíduos da população F1 para caracteres associados ao requerimento de frio hibernal como data de brotação e floração, construir um mapa genético de ligação em população clonal F1 e mapear QTLs associados a estes caracteres. Os genótipos da população F1 de estudo segregaram para os caracteres fenotípicos de brotação vegetativa e floração. Os mapas genéticos dos genitores ‘M13/91’ e ‘Fred Hough’ foram obtidos com 729 e 711 marcadores funcionais do tipo SNP, respectivamente. Dezessete grupos de ligação foram obtidos para cada genitor, cobrindo 1361 cM e 1066 cM para ‘M13/91’ e ‘Fred Hough’, respectivamente. As posições dos marcadores mapeado...
Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the pr... more Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the presence of essential oils. There are few studies about this genus. Thus, the aim of the present study was to characterize native E. muticus populations. The study was performed with five “capim-carona” populations collected in the state of Rio Grande do Sul, totaling 50 plants grown in pots in the Agronomy School. All five E. muticus populations presented variability for phenotypic traits and phenolic compound concentration. The presence of citral was identified in all populations, except in that from the “Morro da Polícia” region. RAPD analysis showed high variability for these populations, allowing the separation of individuals into five groups according to their geographic origin. The highest variability occurred within each population. Based on the results, the populations from São Borja and Agronomy School can be recommended to be used in breeding programsElionurus muticus ocorre nat...
Toxicity by aluminum is one of the main limitations for production in cropping areas, including c... more Toxicity by aluminum is one of the main limitations for production in cropping areas, including corn (Zea mays L.) cultivation. There is genetic variability for the aluminum tolerance traits in corn but selection is troublesome because field assessment is difficult. The ob- jective of the present study was to characterize aluminum tolerance in five corn inbred lines and to identify chromo- somal regions associated to this resistance. A diallel ex- periment was conducted between three aluminum sensi- tive and two aluminum tolerant lines using the root re- growth method. The hybrid populations were superior compared with the parents and, from the partitioning of the heterosis effects; there were significant variety hetero- sis and specific heterosis effects. Lines L06 and L09 showed greater general combining ability and the L10 x L08 cross presented the best specific combination. Molec- ular mapping was performed with SSR in an F3 genera- tion from the cross L10 x L08. Data analysis s...
Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the pr... more Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the presence of essential oils. There are few studies about this genus. Thus, the aim of the present study was to characterize native E. muticus populations. The study was performed with five "capim-carona" populations collected in the state of Rio Grande do Sul, totaling 50 plants grown in pots in the Agronomy School. All five E. muticus populations presented variability for phenotypic traits and phenolic compound concentration. The presence of citral was identified in all populations, except in that from the "Morro da Polícia" region. RAPD analysis showed high variability for these populations, allowing the separation of individuals into five groups according to their geographic origin. The highest variability occurred within each population. Based on the results, the populations from São Borja and Agronomy School can be recommended to be used in breeding programs.
... Lia Rosane Rodrigues, Carolina Tessele, Elisângela Aquino de Souza, Wilson Caetano. R. Bras. ... more ... Lia Rosane Rodrigues, Carolina Tessele, Elisângela Aquino de Souza, Wilson Caetano. R. Bras. ... Apesar de os meristemas terem sido gerados sob condições controladas, a proliferação de microorganismos no meio de indução foi a causa mais expressiva de perdas. ...
Elionurus muticus is a native aromatic grass from the Pampa biome that produces an essential oil ... more Elionurus muticus is a native aromatic grass from the Pampa biome that produces an essential oil that is rich in citral. Despite the importance of citral, few studies have examined this species. The aims of this work were to evaluate the genetic structure and to characterize cytogenetically natural populations collected from Brazil. Genetic characterization was performed using AFLP markers, and cytogenetics assessed the chromosome number, karyotype and meiosis. The studied populations had genetic variability, especially within populations, indicating the possibility of selecting plants with relevant characters. High variability also suggests the preferential occurrence of outcrossing in natural populations. Regular meiosis was observed in the cytogenetic analysis with chromosome number 2n=20. The karyotype of the species is presented for the first time, with the karyotype formula 3sm + 4a + 1saSAT.
A macieira necessita de estímulo do frio para a queda das folhas ao final do ciclo, à dormência h... more A macieira necessita de estímulo do frio para a queda das folhas ao final do ciclo, à dormência hibernal e a sua quebra desta. A não ocorrência adequada de frio no período do inverno resulta em brotação e florescimento irregular, resultando em desenvolvimento vegetativo e reprodutivo deficientes. Os objetivos deste trabalho foram de caracterizar indivíduos da população F1 para caracteres associados ao requerimento de frio hibernal como data de brotação e floração, construir um mapa genético de ligação em população clonal F1 e mapear QTLs associados a estes caracteres. Os genótipos da população F1 de estudo segregaram para os caracteres fenotípicos de brotação vegetativa e floração. Os mapas genéticos dos genitores ‘M13/91’ e ‘Fred Hough’ foram obtidos com 729 e 711 marcadores funcionais do tipo SNP, respectivamente. Dezessete grupos de ligação foram obtidos para cada genitor, cobrindo 1361 cM e 1066 cM para ‘M13/91’ e ‘Fred Hough’, respectivamente. As posições dos marcadores mapeado...
Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the pr... more Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the presence of essential oils. There are few studies about this genus. Thus, the aim of the present study was to characterize native E. muticus populations. The study was performed with five “capim-carona” populations collected in the state of Rio Grande do Sul, totaling 50 plants grown in pots in the Agronomy School. All five E. muticus populations presented variability for phenotypic traits and phenolic compound concentration. The presence of citral was identified in all populations, except in that from the “Morro da Polícia” region. RAPD analysis showed high variability for these populations, allowing the separation of individuals into five groups according to their geographic origin. The highest variability occurred within each population. Based on the results, the populations from São Borja and Agronomy School can be recommended to be used in breeding programsElionurus muticus ocorre nat...
Toxicity by aluminum is one of the main limitations for production in cropping areas, including c... more Toxicity by aluminum is one of the main limitations for production in cropping areas, including corn (Zea mays L.) cultivation. There is genetic variability for the aluminum tolerance traits in corn but selection is troublesome because field assessment is difficult. The ob- jective of the present study was to characterize aluminum tolerance in five corn inbred lines and to identify chromo- somal regions associated to this resistance. A diallel ex- periment was conducted between three aluminum sensi- tive and two aluminum tolerant lines using the root re- growth method. The hybrid populations were superior compared with the parents and, from the partitioning of the heterosis effects; there were significant variety hetero- sis and specific heterosis effects. Lines L06 and L09 showed greater general combining ability and the L10 x L08 cross presented the best specific combination. Molec- ular mapping was performed with SSR in an F3 genera- tion from the cross L10 x L08. Data analysis s...
Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the pr... more Elionurus muticus naturally occurs in southern Brazil and its economic potential is due to the presence of essential oils. There are few studies about this genus. Thus, the aim of the present study was to characterize native E. muticus populations. The study was performed with five "capim-carona" populations collected in the state of Rio Grande do Sul, totaling 50 plants grown in pots in the Agronomy School. All five E. muticus populations presented variability for phenotypic traits and phenolic compound concentration. The presence of citral was identified in all populations, except in that from the "Morro da Polícia" region. RAPD analysis showed high variability for these populations, allowing the separation of individuals into five groups according to their geographic origin. The highest variability occurred within each population. Based on the results, the populations from São Borja and Agronomy School can be recommended to be used in breeding programs.
... Lia Rosane Rodrigues, Carolina Tessele, Elisângela Aquino de Souza, Wilson Caetano. R. Bras. ... more ... Lia Rosane Rodrigues, Carolina Tessele, Elisângela Aquino de Souza, Wilson Caetano. R. Bras. ... Apesar de os meristemas terem sido gerados sob condições controladas, a proliferação de microorganismos no meio de indução foi a causa mais expressiva de perdas. ...
Elionurus muticus is a native aromatic grass from the Pampa biome that produces an essential oil ... more Elionurus muticus is a native aromatic grass from the Pampa biome that produces an essential oil that is rich in citral. Despite the importance of citral, few studies have examined this species. The aims of this work were to evaluate the genetic structure and to characterize cytogenetically natural populations collected from Brazil. Genetic characterization was performed using AFLP markers, and cytogenetics assessed the chromosome number, karyotype and meiosis. The studied populations had genetic variability, especially within populations, indicating the possibility of selecting plants with relevant characters. High variability also suggests the preferential occurrence of outcrossing in natural populations. Regular meiosis was observed in the cytogenetic analysis with chromosome number 2n=20. The karyotype of the species is presented for the first time, with the karyotype formula 3sm + 4a + 1saSAT.
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