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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/01/2010 |
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Data da última atualização: |
23/08/2013 |
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Autoria: |
BLACKMAN, G. E.; WILSON, G. L. |
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Título: |
Physiological and ecological studies in the analysis of plant environment. VII. An analysis of the differential effects of light intensity on the net assimilation rate, leaf-area ratio, and relative growth rate of different species. |
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Ano de publicação: |
1951 |
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Fonte/Imprenta: |
Annals of Botany, London, v. 15, n. 3, p. 373-408, July, 1951. |
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Idioma: |
Inglês |
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Conteúdo: |
Since relative growth rate is the product of net assimilation rate and leaf-area ratio (leaf area/plant weight), it follows that if the effects of shading on both net assimilation rate and leaf-area ratio can be expressed mathematically, then the relationship between light intensity and relative growth rate can be derived from the product of the two mathematical expressions.
For all the ten species investigated in field and pot culture experiments, it has been found that during the early vegetative phase both the changes in leaf-area ratio and net assimilation rate, over the range of 0·1 to full daylight, are linearly related to the logarithm of the light intensity. In consequence, the relationship between relative growth rate and the logarithm of light intensity—being the product of the two linear regressions—is curvilinear.
For species of shady habitats (Geum urbanum, Solamun dulcamara) neither the levels of assimilation rate nor the ‘compensation-point’ values are very different from those of the eight species from open situations (e.g. Hordeum vulgare, Pisum sativum, Fagopyrum esculentum). Nevertheless the intensity at which growth rate is maximal varies between species: it is 0?5 for G. urbanum, 0?7 for H. annuus, full daylight for F. esculentum, while for Trifolium subterraneum the calculated value is 1·8 daylight. Such specific differences can be largely accounted for in terms of the differences in leaf-area ratio at the different light levels.
On the basis of this analysis of the light factor, a ‘shade’ plant is best redefined as a species in which a reduction of the light intensity causes a rapid rise in the leaf-area ratio from an initial low value in full daylight: for a ‘sun’ plant the converse definition holds. MenosSince relative growth rate is the product of net assimilation rate and leaf-area ratio (leaf area/plant weight), it follows that if the effects of shading on both net assimilation rate and leaf-area ratio can be expressed mathematically, then the relationship between light intensity and relative growth rate can be derived from the product of the two mathematical expressions.
For all the ten species investigated in field and pot culture experiments, it has been found that during the early vegetative phase both the changes in leaf-area ratio and net assimilation rate, over the range of 0·1 to full daylight, are linearly related to the logarithm of the light intensity. In consequence, the relationship between relative growth rate and the logarithm of light intensity—being the product of the two linear regressions—is curvilinear.
For species of shady habitats (Geum urbanum, Solamun dulcamara) neither the levels of assimilation rate nor the ‘compensation-point’ values are very different from those of the eight species from open situations (e.g. Hordeum vulgare, Pisum sativum, Fagopyrum esculentum). Nevertheless the intensity at which growth rate is maximal varies between species: it is 0?5 for G. urbanum, 0?7 for H. annuus, full daylight for F. esculentum, while for Trifolium subterraneum the calculated value is 1·8 daylight. Such specific differences can be largely accounted for in terms of the differences in leaf-area ratio at the different light levels.
On the basis of this... Mostrar Tudo |
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Palavras-Chave: |
Ecologia Agricola. |
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Thesagro: |
Fisiologia Vegetal; Morfologia Vegetal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02428naa a2200169 a 4500
001 1828745
005 2013-08-23
008 1951 bl --- 0-- u #d
100 1 $aBLACKMAN, G. E.
245 $aPhysiological and ecological studies in the analysis of plant environment. VII. An analysis of the differential effects of light intensity on the net assimilation rate, leaf-area ratio, and relative growth rate of different species.
260 $c1951
520 $aSince relative growth rate is the product of net assimilation rate and leaf-area ratio (leaf area/plant weight), it follows that if the effects of shading on both net assimilation rate and leaf-area ratio can be expressed mathematically, then the relationship between light intensity and relative growth rate can be derived from the product of the two mathematical expressions. For all the ten species investigated in field and pot culture experiments, it has been found that during the early vegetative phase both the changes in leaf-area ratio and net assimilation rate, over the range of 0·1 to full daylight, are linearly related to the logarithm of the light intensity. In consequence, the relationship between relative growth rate and the logarithm of light intensity—being the product of the two linear regressions—is curvilinear. For species of shady habitats (Geum urbanum, Solamun dulcamara) neither the levels of assimilation rate nor the ‘compensation-point’ values are very different from those of the eight species from open situations (e.g. Hordeum vulgare, Pisum sativum, Fagopyrum esculentum). Nevertheless the intensity at which growth rate is maximal varies between species: it is 0?5 for G. urbanum, 0?7 for H. annuus, full daylight for F. esculentum, while for Trifolium subterraneum the calculated value is 1·8 daylight. Such specific differences can be largely accounted for in terms of the differences in leaf-area ratio at the different light levels. On the basis of this analysis of the light factor, a ‘shade’ plant is best redefined as a species in which a reduction of the light intensity causes a rapid rise in the leaf-area ratio from an initial low value in full daylight: for a ‘sun’ plant the converse definition holds.
650 $aFisiologia Vegetal
650 $aMorfologia Vegetal
653 $aEcologia Agricola
700 1 $aWILSON, G. L.
773 $tAnnals of Botany, London$gv. 15, n. 3, p. 373-408, July, 1951.
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Registro original: |
Embrapa Trigo (CNPT) |
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| 2. |  | CERBARO, L.; LOPES, R. A. M.; MARQUES, M. W.; NAUE, C. R.; NUNES, C. D.; ROSSETTO, E. A. Incidência de patógenos de armazenamentos em sementes de arroz irrigado, da safra 2006/2007, proveniente da cidade de Pelotas/RS. In: CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 40.; Maringá, 2007. [Resumos]. Brasília, DF: SBF, 2007. Fitopatologia Brasileira, Brasília, DF, v. 32, Supl., p.259, ago. 2007.| Tipo: Resumo em Anais de Congresso | Circulação/Nível: -- - -- |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 3. | | CERBARO, L.; LOPES, R. A.; MARQUES, M. W.; NAUE, C. R.; RIFFEL, C. T.; NUNES, C. D.; ROSSETTO, E. A. Ocorrência de patogenos manchadores em sementes de arroz irrigado, sob a cultivar BRS atalanta, na safra de 2006/2007, proveniente de diferentes regiões. In: JORNADA DE PÓS-GRADUAÇÃO E PESQUISA, 5., 2007, Caçapava do Sul. Revista CONGREGA URCAMP, v. 3, n. 3, p. 42, 2007. p. 42| Tipo: Resumo em Anais de Congresso | Circulação/Nível: -- - -- |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 4. | | GOMES, M. J. S.; MENELAU, A. S.; MARQUES, M. W. C. da F.; PAREYN, F. G. C.; BARROS, H. G. L. de. Geração de renda e o manejo florestal em assentamentos de Pernambuco. Revista de Política Agrícola, Brasília, DF, ano 22 , n. 4, p. 56-66, out./nov./dez. 2013.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 5. | | LIMA, N. B.; MARQUES, M. W.; MICHEREFF, S. J.; MORAIS JÚNIOR, M. A.; BARBOSA, M. A. G.; CÂMARA, M. P. S. First report of mango anthracnose caused by Colletotrichum karstii in Brazil. Plant Disease, v. 97, n. 9, p. 1248, sept. 2013.| Tipo: Nota Técnica/Nota Científica |
| Biblioteca(s): Embrapa Semiárido. |
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| 6. | | LOPES, R. A. M.; ANTUNES, I. F.; CASA COILA, V. H.; CERBARO, L.; MARQUES, M. W.; SOUZA, E. B.; ALVES, C. X.; ROSSETTO, E. A. Reação de genótipos crioulos de feijão à oídio (Erysiphe polygoni DC) em casa de vegetação. In: CONGRESSO DE INICIAÇÃO CIENTÍFICA, 16.; ENCONTRO DE PÓS-GRADUAÇÃO, 9., 2007, Pelotas. Pesquisa e responsabilidade ambiental: resumos expandidos ... Pelotas: UFPel: Faculdade de Agronomia Eliseu Maciel, 2007. 01 CD-ROM.| Tipo: Artigo em Anais de Congresso / Nota Técnica |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 8. | | MARQUES, M. W.; LIMA, N. B.; MORAIS JÚNIOR, M. A. de; BARBOSA, M. A. G.; SOUZA, B. O.; MICHEREFF, S. J.; PHILLIPS, A. J. L.; CÂMARA, M. P. S. Species of Lasiodiplodia associated with mango in Brazil. Fungal Diversity, Chiang Mai, v. 61, p. 181-193, 2013.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Semiárido. |
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| 9. | | NAUE, C. R.; GALVÍNCIO J. D.; ANGELOTTI, F.; MARQUES, M. W; FERNADES, H. A.; PINHEIRO, G. S.; BARROS, J. R. A.; BARBOSA, L. G. Comportamento espectral de folhas de mudas de videira cv. Itália com sintomas de míldio. Tropical Plant Pathology, v. 36, 2011. p. 1102. 1 CD-ROM. Suplemento. Edição dos Resumos do 44 Congresso Brasileiro de Fitopatologia, Bento Gonçalves, ago. 2011.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| Registros recuperados : 10 | |
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