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Registro Completo |
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Biblioteca(s): |
Embrapa Meio Norte / UEP-Parnaíba. |
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Data corrente: |
12/03/2008 |
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Data da última atualização: |
12/03/2008 |
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Autoria: |
CHAPMAN, D. F.; LEMAIRE, G. |
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Título: |
Morphogenetic and structural determinants of plant regrowth after defoliation. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
In: INTERNATIONAL GRASSLAND CONGRESS, 17., 1993, Palmerston North. Proceedings...Palmerston North: New Zealand Grassland Association, 1993. p. 95-104. |
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Idioma: |
Inglês |
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Conteúdo: |
Responses of forage to defoliation can be delineated at two levels: physiological responses and morphological responses. Physiological responses are generally defined as occurring over short time-scales, whereas morphological responses are generally considered as being long-term. The extent to which physiological and morphological responses influence pasture characteristics and production depends on the defoliation regime, and the balance obtained between the supply and demand of growth resources by plants. Where defoliation is relatively infrequent and lax, plants may maintain balanced growth of root and shoot purely through short-term physiological responses. However, as defoliation severity increases, morphological adjustments are needed to ensure homeostatic, whole-plant growth. The adaptability of forage species to various points on the continuum of defoliation pressure from lenient to severe depends on their inherent morphological and physiological characteristics. We concentrate on morphogenetic and structural determinants of plant regrowth following defoliation, drawing out the important linkages with the physiological responses. We examine the relationships between plant morphogenesis and sward structure, placing particular emphasis on phenotypic plasticity as a process whereby plant and population structure can alter to maintain homeostatic growth in response to variation in defoliation management. The importance of meristem positioning within the sward and of meristem activity, interacting with defoliation management, as determinants of plant production and persistence is discussed. Relationships between plant morphogenesis, herbage growth dynamics and harvestable herbage production are examined and we identify the collection of fundamental physiological and morphological information for a wider array of forage species as an important research goal for improving the productivity and sustainability of the world's grasslands. MenosResponses of forage to defoliation can be delineated at two levels: physiological responses and morphological responses. Physiological responses are generally defined as occurring over short time-scales, whereas morphological responses are generally considered as being long-term. The extent to which physiological and morphological responses influence pasture characteristics and production depends on the defoliation regime, and the balance obtained between the supply and demand of growth resources by plants. Where defoliation is relatively infrequent and lax, plants may maintain balanced growth of root and shoot purely through short-term physiological responses. However, as defoliation severity increases, morphological adjustments are needed to ensure homeostatic, whole-plant growth. The adaptability of forage species to various points on the continuum of defoliation pressure from lenient to severe depends on their inherent morphological and physiological characteristics. We concentrate on morphogenetic and structural determinants of plant regrowth following defoliation, drawing out the important linkages with the physiological responses. We examine the relationships between plant morphogenesis and sward structure, placing particular emphasis on phenotypic plasticity as a process whereby plant and population structure can alter to maintain homeostatic growth in response to variation in defoliation management. The importance of meristem positioning within the sward and of meri... Mostrar Tudo |
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Palavras-Chave: |
Defoliação; Morfologia. |
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Thesagro: |
Forragem; Planta. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02553naa a2200181 a 4500
001 1082502
005 2008-03-12
008 1993 bl --- 0-- u #d
100 1 $aCHAPMAN, D. F.
245 $aMorphogenetic and structural determinants of plant regrowth after defoliation.
260 $c1993
520 $aResponses of forage to defoliation can be delineated at two levels: physiological responses and morphological responses. Physiological responses are generally defined as occurring over short time-scales, whereas morphological responses are generally considered as being long-term. The extent to which physiological and morphological responses influence pasture characteristics and production depends on the defoliation regime, and the balance obtained between the supply and demand of growth resources by plants. Where defoliation is relatively infrequent and lax, plants may maintain balanced growth of root and shoot purely through short-term physiological responses. However, as defoliation severity increases, morphological adjustments are needed to ensure homeostatic, whole-plant growth. The adaptability of forage species to various points on the continuum of defoliation pressure from lenient to severe depends on their inherent morphological and physiological characteristics. We concentrate on morphogenetic and structural determinants of plant regrowth following defoliation, drawing out the important linkages with the physiological responses. We examine the relationships between plant morphogenesis and sward structure, placing particular emphasis on phenotypic plasticity as a process whereby plant and population structure can alter to maintain homeostatic growth in response to variation in defoliation management. The importance of meristem positioning within the sward and of meristem activity, interacting with defoliation management, as determinants of plant production and persistence is discussed. Relationships between plant morphogenesis, herbage growth dynamics and harvestable herbage production are examined and we identify the collection of fundamental physiological and morphological information for a wider array of forage species as an important research goal for improving the productivity and sustainability of the world's grasslands.
650 $aForragem
650 $aPlanta
653 $aDefoliação
653 $aMorfologia
700 1 $aLEMAIRE, G.
773 $tIn: INTERNATIONAL GRASSLAND CONGRESS, 17., 1993, Palmerston North. Proceedings...Palmerston North: New Zealand Grassland Association, 1993. p. 95-104.
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Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP) |
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| Registros recuperados : 6 | |
| 2. |  | BARRO, R. S.; SAIBRO, J. C.; VARELLA, A. C.; CARASSAI, I. J.; NABINGER, C.; LEMAIRE, G. Morphological acclimatation and canopy structure characteristics of Arachis pintoi under reduced light and at full sun. In: INTERNATIONAL GRASSLAND CONGRESS, 22., 2013, Sidney. Revitalising grasslands to sustain our communities: proceedings. New South Wales: MCI Australia, 2013. p. 1072-1073. Editors David L. Michalk, Geoffrey D. Millar, Warwick B. Badgery, Kim M. Broadfoot.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sul. |
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| 3. | | BARRO, R. S.; SAIBRO, J. C.; VARELLA, A. C.; CARASSAI, I. J.; NABINGER, C.; LEMAIRE, G. Morphological acclimation and canopy structure characteristics of Arachis pintoi under reduced light and at full sun. Tropical Grasslands - Forrajes Tropicales, Cali, v. 2, n. 1, p. 15-17, Mar. 2014.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: C - 0 |
| Biblioteca(s): Embrapa Pecuária Sul. |
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| 4. | | BARRO, R. S.; SAIBRO, J. C.; VARELLA, A. C.; MEDEIROS, R. B.; BANGEL, F. V.; SILVA, J. L. S.; CARASSAI, I. J.; NABINGER, C.; LEMAIRE, G. Canopy structure characteristics of three native perennial grasses with potential for integrated systems. In: INTERNATIONAL SYMPOSIUM ON INTEGRATED CROP-LIVESTOCK SYSTEMS, 2., 2012, Porto Alegre. [Anais...]. [Porto Alegre]: SIA, 2012. 1 pen drive.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sul. |
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| 5. | | BARRO, R. S.; VARELLA, A. C.; LEMAIRE, G.; MEDEIROS, R. B. de; SAIBRO, J. C. de; NABINGER, C.; BANGEL, F. V.; CARASSAI. Forage yield and nitrogen nutrition dynamics of warm-season native forage genotypes under two shading levels and in full sunlight. Revista Brasileira de Zootecnia, Viçosa, MG, v. 41, n. 7, p. 1589-1597, jul. 2012.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
| Biblioteca(s): Embrapa Pecuária Sul. |
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| 6. | | BARTH NETO, A.; CARVALHO, P. C. de F.; LEMAIRE, G.; SBRISSIA, A. F.; CANTO, M. W. do; SAVIAN, J. V.; AMARAL, G. A. do; BREMM. C. Perfilhamento em pastagens de azevém em sucessão a soja ou milho, sob diferentes métodos e intensidades de pastejo. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 48, n. 3, p. 329-338, mar. 2013. Título em inglês: Tillering in Italian ryegrass established after soybean or corn, under different stockings and grazing intensities.| Biblioteca(s): Embrapa Unidades Centrais. |
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| Registros recuperados : 6 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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