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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
20/05/1998 |
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Data da última atualização: |
10/12/2013 |
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Autoria: |
DREW, M. C.; SAKER, L. R.; ASHLEY, T. W. |
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Título: |
Nutrient supply and the growth of the seminal root system in barley. I. The effect of nitrate concentration on the growth of axes and laterals. |
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Ano de publicação: |
1973 |
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Fonte/Imprenta: |
Journal of Experimental Botany, v. 24, n. 83, p. 1189-1202, Dec., 1973. |
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Idioma: |
Inglês |
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Conteúdo: |
A method was devised by which different zones along a single seminal axis of an intact plant could be exposed for extended periods to contrasting concentration of nitrate or in continuous flow, the supply of all other nutrients being favourable throughout. The concentration of nitrate was found to exert a direct and strictly localized effect upon the growth of lateral roots which, depending upon the supply of assimilates from the shoot, resulted in marked modifications to the form of the root system. Zones receiving 1-0 mM nitrate showed an increase in the number and extension rate of both first- and second-order laterals, associated with a preferential accumulation of dry matter, compared with zones in 0-01 mM nitrate. The average number of laterals per cm of parent root was 4-4 in the presence of 1-0 mM nitrate and 2-2 in 0-01 mM. The average extension rates of first-order laterals were 0-61 and 0-26 cm d-1 and second-order laterals, 0-10 and 0-05 cm d-1 for nitrate concentrations of 1-0 and 0-01 mM respectively. The precise numbers and extension rates of laterals in any one zone were affected, however, by the rate of growth of laterals in other parts of the root system. In contrast, the extension rates of axes were little affected by the concentration of nitrate to which their apical meristems were exposed and approached 2-0 cm d-1 provided the plants were not nitrogen-starved. The significance of these results to the physiology of root growth and soil-plant relations is discussed. MenosA method was devised by which different zones along a single seminal axis of an intact plant could be exposed for extended periods to contrasting concentration of nitrate or in continuous flow, the supply of all other nutrients being favourable throughout. The concentration of nitrate was found to exert a direct and strictly localized effect upon the growth of lateral roots which, depending upon the supply of assimilates from the shoot, resulted in marked modifications to the form of the root system. Zones receiving 1-0 mM nitrate showed an increase in the number and extension rate of both first- and second-order laterals, associated with a preferential accumulation of dry matter, compared with zones in 0-01 mM nitrate. The average number of laterals per cm of parent root was 4-4 in the presence of 1-0 mM nitrate and 2-2 in 0-01 mM. The average extension rates of first-order laterals were 0-61 and 0-26 cm d-1 and second-order laterals, 0-10 and 0-05 cm d-1 for nitrate concentrations of 1-0 and 0-01 mM respectively. The precise numbers and extension rates of laterals in any one zone were affected, however, by the rate of growth of laterals in other parts of the root system. In contrast, the extension rates of axes were little affected by the concentration of nitrate to which their apical meristems were exposed and approached 2-0 cm d-1 provided the plants were not nitrogen-starved. The significance of these results to the physiology of root growth and soil-plant relations is ... Mostrar Tudo |
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Palavras-Chave: |
Concentração; Growth. |
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Thesagro: |
Nitrato. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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Marc: |
LEADER 02082naa a2200181 a 4500
001 1051027
005 2013-12-10
008 1973 bl --- 0-- u #d
100 1 $aDREW, M. C.
245 $aNutrient supply and the growth of the seminal root system in barley. I. The effect of nitrate concentration on the growth of axes and laterals.
260 $c1973
520 $aA method was devised by which different zones along a single seminal axis of an intact plant could be exposed for extended periods to contrasting concentration of nitrate or in continuous flow, the supply of all other nutrients being favourable throughout. The concentration of nitrate was found to exert a direct and strictly localized effect upon the growth of lateral roots which, depending upon the supply of assimilates from the shoot, resulted in marked modifications to the form of the root system. Zones receiving 1-0 mM nitrate showed an increase in the number and extension rate of both first- and second-order laterals, associated with a preferential accumulation of dry matter, compared with zones in 0-01 mM nitrate. The average number of laterals per cm of parent root was 4-4 in the presence of 1-0 mM nitrate and 2-2 in 0-01 mM. The average extension rates of first-order laterals were 0-61 and 0-26 cm d-1 and second-order laterals, 0-10 and 0-05 cm d-1 for nitrate concentrations of 1-0 and 0-01 mM respectively. The precise numbers and extension rates of laterals in any one zone were affected, however, by the rate of growth of laterals in other parts of the root system. In contrast, the extension rates of axes were little affected by the concentration of nitrate to which their apical meristems were exposed and approached 2-0 cm d-1 provided the plants were not nitrogen-starved. The significance of these results to the physiology of root growth and soil-plant relations is discussed.
650 $aNitrato
653 $aConcentração
653 $aGrowth
700 1 $aSAKER, L. R.
700 1 $aASHLEY, T. W.
773 $tJournal of Experimental Botany$gv. 24, n. 83, p. 1189-1202, Dec., 1973.
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Registro original: |
Embrapa Meio-Norte (CPAMN) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sul. Para informações adicionais entre em contato com cppsul.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sul. |
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Data corrente: |
09/01/1991 |
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Data da última atualização: |
18/04/2019 |
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Autoria: |
BORBA, M. F. S. |
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Afiliação: |
MARCOS FLAVIO SILVA BORBA, CPPSUL. |
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Título: |
Caracterização de espécies de Haemonchus Cobb, 1898 adquiridas por cordeiros traçadores em sistemas de pastoreio misto e simples de ovinos e bovinos. |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
1988. |
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Páginas: |
52 f. |
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Idioma: |
Português |
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Notas: |
Dissertação (Mestrado em Medicina Veterinária) - Universidade Federal do Rio Grande do Sul, Porto Alegre. |
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Conteúdo: |
Caracterizacao de especies de Haemonchus COBB, 1898 adquiridas por cordeiros tracadores em sistemas de pastoreio misto e simples de ovinos e bovinos. |
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Palavras-Chave: |
Bovinos; Cordeiros; Ovine; Ovinos; Pastoreio misto. |
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Thesagro: |
Bovino; Cordeiro; Ovino; Pastejo; Pastejo Combinado. |
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Thesaurus NAL: |
Bovidae. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00944nam a2200265 a 4500
001 1224662
005 2019-04-18
008 1988 bl uuuu m 00u1 u #d
100 1 $aBORBA, M. F. S.
245 $aCaracterização de espécies de Haemonchus Cobb, 1898 adquiridas por cordeiros traçadores em sistemas de pastoreio misto e simples de ovinos e bovinos.
260 $a1988.$c1988
300 $a52 f.
500 $aDissertação (Mestrado em Medicina Veterinária) - Universidade Federal do Rio Grande do Sul, Porto Alegre.
520 $aCaracterizacao de especies de Haemonchus COBB, 1898 adquiridas por cordeiros tracadores em sistemas de pastoreio misto e simples de ovinos e bovinos.
650 $aBovidae
650 $aBovino
650 $aCordeiro
650 $aOvino
650 $aPastejo
650 $aPastejo Combinado
653 $aBovinos
653 $aCordeiros
653 $aOvine
653 $aOvinos
653 $aPastoreio misto
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