Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)

Detalhes bibliográficos
Autor(a) principal: Rossiello, Roberto Oscar Pereyra
Data de Publicação: 1978
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/1634
Resumo: A study was made of the effect of water stress on three corn (Zea mays L.) cultivars: Piranao, Centralmex and IPEACS III. Under the effect of a - 15 atm stress (using mannitol as osmoticum), Centralmex showed the highest percent germination while IPEACS III showed the lowest. The germination of Piran?o seeds fell in between. There also differences in root and coleoptile growths of the three varieties as compared to that of the controls (germinated in demineralized water). At a more advanced stage of grouth (6-8 leaves, plants in pots kept in a greenhouse), the soil-water stress affected the plants differently. IPEACS III continued to be severely affected but Piran?o was now the least affected, with Centralmex falling in between. The effects of water stress upon the plant metabolic patterns resulted in a increase in the leaf content of nitrate-N, free amino-N, ammonia-N, free proline and soluble sugars.181 There was on the other hand a reduction in nitrate reductase activity and protein content. Although the same general metabolic pattern was observed for the three varieties, significant differences could be detected among the varieties. These results indicated that the greenhouse environment was adequate for the study of plant responses to water stress, even enabling the distinction between varietal differences. The content of free amino-N and soluble sugars in the plant leaves showed a higher sensitivity to moderate water stress than the other indicators. A special attention was given to the study of the increase in free proline levels in the leaves. The ellucidation of the factors governing the relative accumulation of this metabolite in corn leaves requires more detailed studies. Only then could proline content be considered a safe indicator of water stress resistance for corn plants. The plants under water stress were also submitted to growth analysis. This test was very efficient for the study of dry weight and leaf expansion variation among varieties. The results of this study shows that three main factors are responsible for the plant resistance to water stress, namely: a. Tolerance to dehydration (differences in R.W.C.) b. resistance to loss in protein (differences in protein-N levels and free-N/protein-N ratios)182 c. increasc in root/shoot ratios. The present study shows the necessity of experiments with field grown plants, to check the sensitivity of the various factors studied and to compare the behavior of different corn varieties in the field with that in greenhouse.
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spelling Fernandes, Manlio Silvestrehttp://lattes.cnpq.br/6269004387821466http://lattes.cnpq.br/0160231679600890Rossiello, Roberto Oscar Pereyra2017-05-12T12:35:58Z1978-07-10ROSSIELLO, Roberto Oscar Pereyra. Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L). 1978. 201 f. Disserta??o (Mestrado em Agronomia, Ci?ncia do Solo) - Instituto de Agronomia , Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 1978.https://tede.ufrrj.br/jspui/handle/jspui/1634A study was made of the effect of water stress on three corn (Zea mays L.) cultivars: Piranao, Centralmex and IPEACS III. Under the effect of a - 15 atm stress (using mannitol as osmoticum), Centralmex showed the highest percent germination while IPEACS III showed the lowest. The germination of Piran?o seeds fell in between. There also differences in root and coleoptile growths of the three varieties as compared to that of the controls (germinated in demineralized water). At a more advanced stage of grouth (6-8 leaves, plants in pots kept in a greenhouse), the soil-water stress affected the plants differently. IPEACS III continued to be severely affected but Piran?o was now the least affected, with Centralmex falling in between. The effects of water stress upon the plant metabolic patterns resulted in a increase in the leaf content of nitrate-N, free amino-N, ammonia-N, free proline and soluble sugars.181 There was on the other hand a reduction in nitrate reductase activity and protein content. Although the same general metabolic pattern was observed for the three varieties, significant differences could be detected among the varieties. These results indicated that the greenhouse environment was adequate for the study of plant responses to water stress, even enabling the distinction between varietal differences. The content of free amino-N and soluble sugars in the plant leaves showed a higher sensitivity to moderate water stress than the other indicators. A special attention was given to the study of the increase in free proline levels in the leaves. The ellucidation of the factors governing the relative accumulation of this metabolite in corn leaves requires more detailed studies. Only then could proline content be considered a safe indicator of water stress resistance for corn plants. The plants under water stress were also submitted to growth analysis. This test was very efficient for the study of dry weight and leaf expansion variation among varieties. The results of this study shows that three main factors are responsible for the plant resistance to water stress, namely: a. Tolerance to dehydration (differences in R.W.C.) b. resistance to loss in protein (differences in protein-N levels and free-N/protein-N ratios)182 c. increasc in root/shoot ratios. The present study shows the necessity of experiments with field grown plants, to check the sensitivity of the various factors studied and to compare the behavior of different corn varieties in the field with that in greenhouse.Tr?s variedades de milho (Zea mays L.), Piran?o, Centralmex e IPEACS III, foram submetidas a stress h?drico em duas fases do crescimento vegetativo. As diferen?as na taxa e percentagem final de germina- ??o, alongamento da raiz e do cole?ptilo foram avaliadas nas tr?s variedades, quando submetidos a um stress osm?tico de -15 atmosferas, usando-se manitol como osmoticum. Centralmex mostrou a maior percentagem de germina??o final nestas candi- ??es e IPEACS III, a menor; Piran?o apresentou um comportamento intermedi?rio. Diferen?as entre as variedades nos respectivos percentuais de alongamento da raiz e cole?ptilo foram notadas ao serem comparadas com seus controles mantidos em ?gua deionizada. Quando as variedades foram comparadas em um est?gio mais avan?ado de crescimento (6-8 folhas), e o stress h?drico induzido por desseca??o progressiva do solo, em casa de vegeta??o, a variedade IPEACS III mostrou-se severamente afetada,Piran?o, relativamente, a menos afetada, apresentando Centralmex um comportamento intermedi?rio. Neste ?ltimo est?gio de crescimento, fez- se uma compara??o da sensibilidade de distintos indicadores metab?licos ? defici?ncia h?drica. Com rela??o ao metabolismo de N, foram avaliados os teores foliares de N-n?trico, N-amoniacal, N-amino livre, prolina e N-proteico. No que diz respeito ao metabolismo de carbohidratos, avaliou-se o teor foliar de carbohidratos sol?veis. Foram observados incrementos nos teores de N-amoniacal, N-n?- trico, N-amino livre, prolina e carbohidratos sol?veis. Concomitantemente, observou-se decr?scimos para o teor de N-proteico e a atividade de nitrato-reductase. Este padr?o geral de varia??o, em resposta a stress h?drico, se expressou em forma diferencial (estatisticamente significativa) entre variedades, indicando que, o ambiente proporcionado pela casa de vegeta??o foi apropriado para a separa??o dos efeitos decorrentes do stress h?drico daqueles devidos ?s caracter?sticas varietais. Os teores de N-amino livre e carbohidrato sol?vel mostraram uma maior sensibilidade a deficits h?dricos moderados. Em adi??o aos indicadores metab?licos, realizou-se a an?lise de crescimento, que mostrou ser um procedimento apropriado para descrever as varia??es em taxas de acumula??o de mat?ria seca e expans?o de ?rea foliar entre as variedades. Os dados sugeriram que, as diferen?as observadas em resist?ncia ao stress h?drico entre as variedades podem ser decorrentes de tr?s tipos de efeitos: toler?ncia ? desidrata ??o (diferen?as em C.H.R.), toler?ncia a perda de prote?nas (diferen?as nos teores de N-proteico e na rela??o N-sol?vel/ N-proteico) e incrementos na rela??o raiz/parte a?rea. A evolu??o do teor foliar de prolina foi particularmente observada nos tr?s cultivares, visando-se ligar o seu teor ? explica??o das diferen?as em sensibilidade (ou resist?ncia) ao stress h?drico. Os resultados atualmente obtidos, mostraram que, pelo menos em milho, ? necess?rio um estudo mais detido dos fatores que governam a acumula??o deste metab?lito, antes de aplicar-se indiscriminadamente este par?metro como indicador de resist?ncia ? seca. Finalmente, foi destacada a necessidade de experimenta??o direta no campo, visando a determina??o do grau de sensibilidade dos distintos indicadores e a quantifica??o das diferen?as com respeito ao comportamento das variedades em casa de vegeta??o.Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-05-12T12:35:58Z No. of bitstreams: 1 1978 - Roberto Oscar Pereyra Rossielo.pdf: 1070327 bytes, checksum: 2a0b73b43c35132e3d9af4dfca0ed376 (MD5)Made available in DSpace on 2017-05-12T12:35:58Z (GMT). No. of bitstreams: 1 1978 - Roberto Oscar Pereyra Rossielo.pdf: 1070327 bytes, checksum: 2a0b73b43c35132e3d9af4dfca0ed376 (MD5) Previous issue date: 1978-07-10application/pdfhttps://tede.ufrrj.br/retrieve/53282/1978%20-%20Roberto%20Oscar%20Pereyra%20Rossielo.pdf.jpgporUniversidade Federal Rural do Rio de JaneiroPrograma de P?s-Gradua??o em Agronomia - Ci?ncia do SoloUFRRJBrasilInstituto de AgronomiaACEVEDO, E., HSIAO, T.C. e HENDERSON, D.W., 1971. 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dc.title.por.fl_str_mv Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
dc.title.alternative.eng.fl_str_mv Indicators of water deficiency in three maize varieties (Zea Marys L)
title Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
spellingShingle Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
Rossiello, Roberto Oscar Pereyra
Milho
Defici?ncia h?drica
Agronomia
title_short Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
title_full Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
title_fullStr Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
title_full_unstemmed Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
title_sort Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L)
author Rossiello, Roberto Oscar Pereyra
author_facet Rossiello, Roberto Oscar Pereyra
author_role author
dc.contributor.advisor1.fl_str_mv Fernandes, Manlio Silvestre
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/6269004387821466
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/0160231679600890
dc.contributor.author.fl_str_mv Rossiello, Roberto Oscar Pereyra
contributor_str_mv Fernandes, Manlio Silvestre
dc.subject.por.fl_str_mv Milho
Defici?ncia h?drica
topic Milho
Defici?ncia h?drica
Agronomia
dc.subject.cnpq.fl_str_mv Agronomia
description A study was made of the effect of water stress on three corn (Zea mays L.) cultivars: Piranao, Centralmex and IPEACS III. Under the effect of a - 15 atm stress (using mannitol as osmoticum), Centralmex showed the highest percent germination while IPEACS III showed the lowest. The germination of Piran?o seeds fell in between. There also differences in root and coleoptile growths of the three varieties as compared to that of the controls (germinated in demineralized water). At a more advanced stage of grouth (6-8 leaves, plants in pots kept in a greenhouse), the soil-water stress affected the plants differently. IPEACS III continued to be severely affected but Piran?o was now the least affected, with Centralmex falling in between. The effects of water stress upon the plant metabolic patterns resulted in a increase in the leaf content of nitrate-N, free amino-N, ammonia-N, free proline and soluble sugars.181 There was on the other hand a reduction in nitrate reductase activity and protein content. Although the same general metabolic pattern was observed for the three varieties, significant differences could be detected among the varieties. These results indicated that the greenhouse environment was adequate for the study of plant responses to water stress, even enabling the distinction between varietal differences. The content of free amino-N and soluble sugars in the plant leaves showed a higher sensitivity to moderate water stress than the other indicators. A special attention was given to the study of the increase in free proline levels in the leaves. The ellucidation of the factors governing the relative accumulation of this metabolite in corn leaves requires more detailed studies. Only then could proline content be considered a safe indicator of water stress resistance for corn plants. The plants under water stress were also submitted to growth analysis. This test was very efficient for the study of dry weight and leaf expansion variation among varieties. The results of this study shows that three main factors are responsible for the plant resistance to water stress, namely: a. Tolerance to dehydration (differences in R.W.C.) b. resistance to loss in protein (differences in protein-N levels and free-N/protein-N ratios)182 c. increasc in root/shoot ratios. The present study shows the necessity of experiments with field grown plants, to check the sensitivity of the various factors studied and to compare the behavior of different corn varieties in the field with that in greenhouse.
publishDate 1978
dc.date.issued.fl_str_mv 1978-07-10
dc.date.accessioned.fl_str_mv 2017-05-12T12:35:58Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.citation.fl_str_mv ROSSIELLO, Roberto Oscar Pereyra. Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L). 1978. 201 f. Disserta??o (Mestrado em Agronomia, Ci?ncia do Solo) - Instituto de Agronomia , Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 1978.
dc.identifier.uri.fl_str_mv https://tede.ufrrj.br/jspui/handle/jspui/1634
identifier_str_mv ROSSIELLO, Roberto Oscar Pereyra. Indicadores de defici?ncia h?drica em tr?s variedades de milho (Zea Marys L). 1978. 201 f. Disserta??o (Mestrado em Agronomia, Ci?ncia do Solo) - Instituto de Agronomia , Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 1978.
url https://tede.ufrrj.br/jspui/handle/jspui/1634
dc.language.iso.fl_str_mv por
language por
dc.relation.references.por.fl_str_mv ACEVEDO, E., HSIAO, T.C. e HENDERSON, D.W., 1971. Immediate and subsequent growth responses of maize leaves to changes in water status. Plant Physiol., 48:631-636. ALLAWAY, W.G. e MILTHORPE, F.L., 1976. Structure and functioning of stomata in: Water deficits and plant growth. Vol. IV _ T.T. Kozlowski (Ed.) Academic Press, New York, London. ARAD, S. e RICHMOND, A.E., 1976. Leaf cell water and enzyme activity. Plant Physiol., 57:656-658. ARNON, I., 1975a. Physiological principles of dryland crop production in: Physiological aspects of dryland farming. U.S. Gupta (Ed.). Applied Science Publishers Ltd., England, ARNON, I., 1975b. Mineral nutrition of maize. International Potash Institute. Bern-Worblaufen, Switzerland. AUNG, L.H., 1974. Root-shoot relationships in: The plant root and its environment. E.W. Carson (Ed.). University Press of Virginia. Charlottesville.BARDZIK, J.M., MARSH Jr., H.V. e HAVIS, J.R., 1971. 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repository.name.fl_str_mv Biblioteca Digital de Teses e Dissertações da UFRRJ - Universidade Federal Rural do Rio de Janeiro (UFRRJ)
repository.mail.fl_str_mv bibliot@ufrrj.br||bibliot@ufrrj.br
_version_ 1797220039497089024

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