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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental; Embrapa Cerrados; Embrapa Mandioca e Fruticultura; Embrapa Meio-Norte. |
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Data corrente: |
07/04/1994 |
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Data da última atualização: |
16/11/2023 |
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Autoria: |
PORTO. M. C. M. |
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Afiliação: |
EMBRAPA-CNPMF. |
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Título: |
Physiological mechanisms of drought tolerance in cassava (Manihot esculenta Crantz). |
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Ano de publicação: |
1983 |
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Fonte/Imprenta: |
Arizona: University of Arizona, 1983. |
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Páginas: |
114p. |
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Série: |
Tese Doutorado |
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Idioma: |
Inglês |
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Conteúdo: |
The response of cassava (Manihot esculenta Crantz) to water stress was evaluated in two experiments conducted in Tucson, Arizona and Santander de Quilichao, Colombia, involving five cultivars (Mven 218, CMC 40, MCol 22, Mita 1158 and MCol 1684). In both experiments stress was imposed in a given stage of the plant cycle. A third experiment, conducted in Palmira, Colombia, evaluated the relationship existng between photosynthesis, relative humidity and yields of cassava. Cultivar MCol 1684 reduced its transpirating area by either reducing leaf formation (stress given to 3-month-old plants) or increasing leaf fall (6-month-old plants). A reduction in plant growth and leaf expansion rates is attributed to reducing the plant's total leaf area. Water stress imposed in Tucson also showed reductions in plant growth, leaf formation, extension and final leaf size (except for MVen 218). Plants of MCol 1684 in Santander de Quilichao, like MVen 218 in Tucson, did not change their final leaf leaf sizes due to stress. Dry matter production was more reduced when stress was imposed early in the plant growth cycle. Dry matter partitioning was also altered by stress given to 3-month-old plants of MCol 1684. The stressed plants delayed the allocation of dry matter to the storage roots. Noon and afternoon values of leaf coductance and transpiration of MCol 1684 were reduced after 40 days of stress. Interestingly, leaf temperatures of non-stressed plants were higher than those of the stressed plants. This can be attributed to an increase in leaf reflectance in the stressed plants by changing the angle of orientation of their leaves in relation to the sun. Leaf coductances of non-stressed plants were correlated to photosynthesis, leaf temperatures and vapor pressure deficits in measurements taken at 3:00 PM. In the stressed plants conductances were also correlated to photosynthesis leaf temperatures, air moisture and transpiration. Leaf water potentials were slightly reduced by stress in Tucson, except for MVen 218. Plants of MCol 1684, in Quilichao, did not show significant reduction in L due to stress. In contrast, noon and mid-afternoon values of L were lower in the non-stressed plants after 30-40 days of treatment. This suggests the occurrence of higher daily water stresses in non-stressed plants, because of elevated transpiration rates. The effect of air humidity on the stomatal functioning of MCol 1684 seems to be strong, as proved the dependence of transpiration, conductances and photosynthesis on relative humidity. MenosThe response of cassava (Manihot esculenta Crantz) to water stress was evaluated in two experiments conducted in Tucson, Arizona and Santander de Quilichao, Colombia, involving five cultivars (Mven 218, CMC 40, MCol 22, Mita 1158 and MCol 1684). In both experiments stress was imposed in a given stage of the plant cycle. A third experiment, conducted in Palmira, Colombia, evaluated the relationship existng between photosynthesis, relative humidity and yields of cassava. Cultivar MCol 1684 reduced its transpirating area by either reducing leaf formation (stress given to 3-month-old plants) or increasing leaf fall (6-month-old plants). A reduction in plant growth and leaf expansion rates is attributed to reducing the plant's total leaf area. Water stress imposed in Tucson also showed reductions in plant growth, leaf formation, extension and final leaf size (except for MVen 218). Plants of MCol 1684 in Santander de Quilichao, like MVen 218 in Tucson, did not change their final leaf leaf sizes due to stress. Dry matter production was more reduced when stress was imposed early in the plant growth cycle. Dry matter partitioning was also altered by stress given to 3-month-old plants of MCol 1684. The stressed plants delayed the allocation of dry matter to the storage roots. Noon and afternoon values of leaf coductance and transpiration of MCol 1684 were reduced after 40 days of stress. Interestingly, leaf temperatures of non-stressed plants were higher than those of the stressed pla... Mostrar Tudo |
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Palavras-Chave: |
Drought resistance; Estados Unidos; Estresse hidrico; Palmira; Plant water relations; Quilichao; Relative umidity; Tolerancia a seca; Tucson; Whater stress. |
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Thesagro: |
Deficiência Hídrica; Fisiologia; Fotossíntese; Mandioca; Manihot Esculenta; Matéria Seca; Produtividade; Relação Água-Planta; Resistência a Seca; Umidade Relativa. |
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Thesaurus Nal: |
Arizona; cassava; Colombia; drought tolerance; dry matter content; Manihot; photosynthesis; physiology; United States; yields. |
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Categoria do assunto: |
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F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 03829nam a2200493 a 4500
001 1651391
005 2023-11-16
008 1983 bl uuuu m 00u1 u #d
100 1 $aPORTO. M. C. M.
245 $aPhysiological mechanisms of drought tolerance in cassava (Manihot esculenta Crantz).
260 $aArizona: University of Arizona$c1983
300 $a114p.
490 $aTese Doutorado
520 $aThe response of cassava (Manihot esculenta Crantz) to water stress was evaluated in two experiments conducted in Tucson, Arizona and Santander de Quilichao, Colombia, involving five cultivars (Mven 218, CMC 40, MCol 22, Mita 1158 and MCol 1684). In both experiments stress was imposed in a given stage of the plant cycle. A third experiment, conducted in Palmira, Colombia, evaluated the relationship existng between photosynthesis, relative humidity and yields of cassava. Cultivar MCol 1684 reduced its transpirating area by either reducing leaf formation (stress given to 3-month-old plants) or increasing leaf fall (6-month-old plants). A reduction in plant growth and leaf expansion rates is attributed to reducing the plant's total leaf area. Water stress imposed in Tucson also showed reductions in plant growth, leaf formation, extension and final leaf size (except for MVen 218). Plants of MCol 1684 in Santander de Quilichao, like MVen 218 in Tucson, did not change their final leaf leaf sizes due to stress. Dry matter production was more reduced when stress was imposed early in the plant growth cycle. Dry matter partitioning was also altered by stress given to 3-month-old plants of MCol 1684. The stressed plants delayed the allocation of dry matter to the storage roots. Noon and afternoon values of leaf coductance and transpiration of MCol 1684 were reduced after 40 days of stress. Interestingly, leaf temperatures of non-stressed plants were higher than those of the stressed plants. This can be attributed to an increase in leaf reflectance in the stressed plants by changing the angle of orientation of their leaves in relation to the sun. Leaf coductances of non-stressed plants were correlated to photosynthesis, leaf temperatures and vapor pressure deficits in measurements taken at 3:00 PM. In the stressed plants conductances were also correlated to photosynthesis leaf temperatures, air moisture and transpiration. Leaf water potentials were slightly reduced by stress in Tucson, except for MVen 218. Plants of MCol 1684, in Quilichao, did not show significant reduction in L due to stress. In contrast, noon and mid-afternoon values of L were lower in the non-stressed plants after 30-40 days of treatment. This suggests the occurrence of higher daily water stresses in non-stressed plants, because of elevated transpiration rates. The effect of air humidity on the stomatal functioning of MCol 1684 seems to be strong, as proved the dependence of transpiration, conductances and photosynthesis on relative humidity.
650 $aArizona
650 $acassava
650 $aColombia
650 $adrought tolerance
650 $adry matter content
650 $aManihot
650 $aphotosynthesis
650 $aphysiology
650 $aUnited States
650 $ayields
650 $aDeficiência Hídrica
650 $aFisiologia
650 $aFotossíntese
650 $aMandioca
650 $aManihot Esculenta
650 $aMatéria Seca
650 $aProdutividade
650 $aRelação Água-Planta
650 $aResistência a Seca
650 $aUmidade Relativa
653 $aDrought resistance
653 $aEstados Unidos
653 $aEstresse hidrico
653 $aPalmira
653 $aPlant water relations
653 $aQuilichao
653 $aRelative umidity
653 $aTolerancia a seca
653 $aTucson
653 $aWhater stress
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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| Registros recuperados : 10 | |
| 3. |  | PORTO, M. C. M. Fisiologia da mandioca. Cruz das Almas: EMBRAPA-CNPMF, 1986. 21 p. VI Curso Intensivo Nacional de Mandioca realizado em Cruz das Almas, BA. 1986.| Biblioteca(s): Embrapa Mandioca e Fruticultura. |
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| 7. | | PORTO, M. C. M.; COCK, J. H.; CADENA, G. G. de; PARRA, G. E.; HERNÁNDEZ, A. D. P. Acúmulo e Distribuição de Matéria Seca em Mandioca Submetida a Deficiência Hídrica. Pesquisa Agropecuária Brasileira, Brasília, v. 24, n.5, p. 557.565, maio 1989| Biblioteca(s): Embrapa Unidades Centrais. |
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| 9. | | PORTO, M. C. M.; CARVALHO, J. E. B. de; MATTOS, P. L. P. de; MACEDO, M. C. M. Influência da parte da haste na propagação rápida da mandioca. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 14, n. 3, p. 251-253, jul. 1979 Título em inglês: Origin of the planting material and its influence on the rapid propagation method of cassava.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 10. | | CORSO, I. C.; SANTOS FILHO, J. M. dos; FONTANA, G.; PORTO, M. C. M.; ORREGO, F. I.; MOROSINI, S.; CAMPELLO, G. de J.; GALILEO, M. H. M.; RODRIGUES, A. L. Morfologia, nutricao e manejo da cultura da soja. Trigo e Soja, Porto Alegre, v. 1, n. 9, p. 3-19, fev. 1976.| Tipo: Artigo de Divulgação na Mídia |
| Biblioteca(s): Embrapa Soja. |
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| Registros recuperados : 10 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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