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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
06/08/1998 |
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Data da última atualização: |
06/08/1998 |
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Autoria: |
MOURA, V. P. G. |
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Título: |
Altitudional variation in Eucalyptus urophylla S.T Blake. |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Melbourne: University of Melbourne, 1977. |
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Páginas: |
168p. |
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Idioma: |
Inglês |
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Conteúdo: |
Eucalyptus urophylla S.T. Blake is a tropical species occurring naturally in a group of islands of the Lesser Sunda Archipelago, beteween 6 and 10 latitude Sourth and between 188 and 128 longitude East. E. urophylla grows in a wide range of soils from almost sea level to 2980 meters in altitude. The climate ranges from hot to cool tropical conditions with a pronounced dry seasson of about three months in the winter. A study was made of genetic variation in E. urophylla taken from an altitudional transect mostly in East Timor with the exception of one seed sample which came from 600m altitude in the nearby island of pantar. The physiological basis of the genetic variation with altitude was examined by growing seedlings fram six altitudes, 600, 1200, 1500, 2100m and 2740m, under controlled conditions. The seeds were found to vary in size with altitude, being larger in the provenances from higher altitudes. Cotyledon size was dependent on seed size and strongly affected the early seedling growth, larger cotyledons resulting in larger seedlings up to four weeks of age. After four weeks the positive relationship of cotyledon size and seedling growth changed, firstly disappearing in the six-week-old seedlings then becaming negative in seedlings at eight weeks of age. The germination of seeds in a range of constant temperature (10 to 40) showed that all provenances germinated equally weel between 20 and 32 C, with an optium around 31C. These was a slightly superior rate of germination of the high altitude provences at the lawest temperature regime. Seedlings grown at four temperatures (12, 20, 25 and 30 C) fram 12 to 22 weeks age showed that all provenances grew best at the two highest temperatures. Howeres, differences were found between provenances with a trend to decreased height and dry weight with increasing altitude. This trend was associated with changes in certain characters. Leaf size and internode length decreased with rise in altitude of seed provenance while leaf thickness increased with altitude. Two conclusions are drawn with regard to field plantations o f E. urophylla in the tropics. The firsts is that seedling selection shoud be delayed until the age at least eight weeks in order to avoid the overriding influence of seed and cotyledon size the early growth of seedlings. The second is that low altitude populations are better adapted to grow in high temperature conditions, but high altitude populations are likely to be more successful in the cool conditions found at high altitudes. MenosEucalyptus urophylla S.T. Blake is a tropical species occurring naturally in a group of islands of the Lesser Sunda Archipelago, beteween 6 and 10 latitude Sourth and between 188 and 128 longitude East. E. urophylla grows in a wide range of soils from almost sea level to 2980 meters in altitude. The climate ranges from hot to cool tropical conditions with a pronounced dry seasson of about three months in the winter. A study was made of genetic variation in E. urophylla taken from an altitudional transect mostly in East Timor with the exception of one seed sample which came from 600m altitude in the nearby island of pantar. The physiological basis of the genetic variation with altitude was examined by growing seedlings fram six altitudes, 600, 1200, 1500, 2100m and 2740m, under controlled conditions. The seeds were found to vary in size with altitude, being larger in the provenances from higher altitudes. Cotyledon size was dependent on seed size and strongly affected the early seedling growth, larger cotyledons resulting in larger seedlings up to four weeks of age. After four weeks the positive relationship of cotyledon size and seedling growth changed, firstly disappearing in the six-week-old seedlings then becaming negative in seedlings at eight weeks of age. The germination of seeds in a range of constant temperature (10 to 40) showed that all provenances germinated equally weel between 20 and 32 C, with an optium around 31C. These was a slightly superior rate of germinat... Mostrar Tudo |
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Palavras-Chave: |
Eucalyptus erophylla; Genetic cariation. |
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Thesagro: |
Altitude; Eucalipto; Plântula; Semente; Variação Genética. |
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Thesaurus Nal: |
seedlings; seeds. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03115nam a2200229 a 4500
001 1558303
005 1998-08-06
008 1977 bl uuuu m 00u1 u #d
100 1 $aMOURA, V. P. G.
245 $aAltitudional variation in Eucalyptus urophylla S.T Blake.
260 $aMelbourne: University of Melbourne$c1977
300 $a168p.
520 $aEucalyptus urophylla S.T. Blake is a tropical species occurring naturally in a group of islands of the Lesser Sunda Archipelago, beteween 6 and 10 latitude Sourth and between 188 and 128 longitude East. E. urophylla grows in a wide range of soils from almost sea level to 2980 meters in altitude. The climate ranges from hot to cool tropical conditions with a pronounced dry seasson of about three months in the winter. A study was made of genetic variation in E. urophylla taken from an altitudional transect mostly in East Timor with the exception of one seed sample which came from 600m altitude in the nearby island of pantar. The physiological basis of the genetic variation with altitude was examined by growing seedlings fram six altitudes, 600, 1200, 1500, 2100m and 2740m, under controlled conditions. The seeds were found to vary in size with altitude, being larger in the provenances from higher altitudes. Cotyledon size was dependent on seed size and strongly affected the early seedling growth, larger cotyledons resulting in larger seedlings up to four weeks of age. After four weeks the positive relationship of cotyledon size and seedling growth changed, firstly disappearing in the six-week-old seedlings then becaming negative in seedlings at eight weeks of age. The germination of seeds in a range of constant temperature (10 to 40) showed that all provenances germinated equally weel between 20 and 32 C, with an optium around 31C. These was a slightly superior rate of germination of the high altitude provences at the lawest temperature regime. Seedlings grown at four temperatures (12, 20, 25 and 30 C) fram 12 to 22 weeks age showed that all provenances grew best at the two highest temperatures. Howeres, differences were found between provenances with a trend to decreased height and dry weight with increasing altitude. This trend was associated with changes in certain characters. Leaf size and internode length decreased with rise in altitude of seed provenance while leaf thickness increased with altitude. Two conclusions are drawn with regard to field plantations o f E. urophylla in the tropics. The firsts is that seedling selection shoud be delayed until the age at least eight weeks in order to avoid the overriding influence of seed and cotyledon size the early growth of seedlings. The second is that low altitude populations are better adapted to grow in high temperature conditions, but high altitude populations are likely to be more successful in the cool conditions found at high altitudes.
650 $aseedlings
650 $aseeds
650 $aAltitude
650 $aEucalipto
650 $aPlântula
650 $aSemente
650 $aVariação Genética
653 $aEucalyptus erophylla
653 $aGenetic cariation
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Embrapa Cerrados (CPAC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
20/09/2012 |
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Data da última atualização: |
19/05/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 5 |
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Autoria: |
SANTOS, D. B. dos; CECÍLIO, R. A.; COELHO, E. F.; BATISTA, R. O.; SILVA, A. J. P. da. |
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Afiliação: |
DELFRAN BATISTA DOS SANTOS, IF BAIANO; ROBERTO AVELINO CECÍLIO, UFES; EUGENIO FERREIRA COELHO, CNPMF; RAFAEL OLIVEIRA BATISTA, UFERSA; ALISSON JADAVI PEREIRA DA SILVA, IF BAIANO. |
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Título: |
Calibração de TDR: desempenho de alguns métodos e equações de calibração. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
Agrarian, Dourados, v. 5, n. 16, p. 131-139, 2012. |
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ISSN: |
1984-2538 |
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Idioma: |
Português |
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Conteúdo: |
A utilização da técnica da "Reflectometria no Dominio do Tempo" tem proporcionado uma contribuição relevante para os estudos da relação solo-água-planta. A calibração desse equipamento tem sido necessária, devido à dependência relacionada aos atributos físicos e químicos dos diferentes tipos de solo. Nesse trabalho foram ajustadas equações de calibração para dois solos de texturas diferentes (franco arenoso e argiloso), a partir de duas metodologias de preparo de amostras para calibração. Os resultados levaram à conclusão de que as equações de calibração obtidas explicaram satisfatoriamente a variação da umidade do solo; e as duas metodologias aplicadas no trabalho se mostraram adequadas para calibração dos solos estudados. |
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Palavras-Chave: |
Calibração de TDR; Constante dielétrica; Reflectometria no domínio do tempo. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 01425naa a2200217 a 4500
001 1934164
005 2023-05-19
008 2012 bl uuuu u00u1 u #d
022 $a1984-2538
100 1 $aSANTOS, D. B. dos
245 $aCalibração de TDR$bdesempenho de alguns métodos e equações de calibração.$h[electronic resource]
260 $c2012
520 $aA utilização da técnica da "Reflectometria no Dominio do Tempo" tem proporcionado uma contribuição relevante para os estudos da relação solo-água-planta. A calibração desse equipamento tem sido necessária, devido à dependência relacionada aos atributos físicos e químicos dos diferentes tipos de solo. Nesse trabalho foram ajustadas equações de calibração para dois solos de texturas diferentes (franco arenoso e argiloso), a partir de duas metodologias de preparo de amostras para calibração. Os resultados levaram à conclusão de que as equações de calibração obtidas explicaram satisfatoriamente a variação da umidade do solo; e as duas metodologias aplicadas no trabalho se mostraram adequadas para calibração dos solos estudados.
653 $aCalibração de TDR
653 $aConstante dielétrica
653 $aReflectometria no domínio do tempo
700 1 $aCECÍLIO, R. A.
700 1 $aCOELHO, E. F.
700 1 $aBATISTA, R. O.
700 1 $aSILVA, A. J. P. da
773 $tAgrarian, Dourados$gv. 5, n. 16, p. 131-139, 2012.
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