Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Digital da Universidade Federal Rural do Semi-Árido (RDU) |
Texto Completo: | https://repositorio.ufersa.edu.br/handle/tede/92 |
Resumo: | There is no doubt that the effect of weed causes damage to various human activities and especially those for agricultural use. Therefore, if not properly handled, can reduce productivity and production quality due to competition for light, nutrients, and especially water, which is the most abundant resource, while the most limiting to agricultural productivity. This study aimed to assess the potential for competition four weed species by water. The experiment was conducted in a factorial 4 x 2, distributed in a randomized complete block design, with five replications. were studied species malva-branca (Waltheria indica L.); crotalária (Crotalaria retusa L.); mussambê (Cleome affinis DC.) and trapoeraba (Commelina benghalensis L.), with two water regimes (with and without water stress). Plants subjected to water stress had suspended irrigation during flowering, and maintained until the CO2 assimilation rate of plants to morning 9am reached values close to zero, at the resumed irrigation. As from the date irrigation suspension the plants were submitted to the following evaluations: water potential before dawn (ΨAM) and water potential at noon (ΨMD) (MPa); photosynthesis (A; CO2 μmol m-2); stomatal conductance (gs; μmol H2O m-2 s-1), and transpiration (E; mmol H2O m-2 s-1) carried out every day until the photosynthetic rates of plants subjected to water stress is to equalize plants without stress. At the end of the experiment was measured leaf area (cm2), the dry mass of roots, stems, leaves and total (g), the chlorophyll content index near the apex of the leaves and the next leaves the base. Was also determined daily water consumption species (mL). The results grouped the plants into two groups: trapoeraba and mussambê, considered conservative, keeping the high water potential and transpiration, being uncompetitive by water, and crotalária and malva-branca, medium investors, able to reduce the water potential and stomatal aperture values higher, resulting in greater potential for competition for water. And in low water availability conditions, the mauve-white is the most competitive for water, because it can maintain high water consumption levels over time |
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Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidrataçãoEcophysiology of weed under water stress and rehydrationweedsCompetition for water - weedsPhotosynthesisPower ratingstomatal conductancePlantas daninhasCompetição por água - plantas daninhasFotossíntesePotenciaCondutância estomáticaCNPQ::CIENCIAS AGRARIAS::AGRONOMIAThere is no doubt that the effect of weed causes damage to various human activities and especially those for agricultural use. Therefore, if not properly handled, can reduce productivity and production quality due to competition for light, nutrients, and especially water, which is the most abundant resource, while the most limiting to agricultural productivity. This study aimed to assess the potential for competition four weed species by water. The experiment was conducted in a factorial 4 x 2, distributed in a randomized complete block design, with five replications. were studied species malva-branca (Waltheria indica L.); crotalária (Crotalaria retusa L.); mussambê (Cleome affinis DC.) and trapoeraba (Commelina benghalensis L.), with two water regimes (with and without water stress). Plants subjected to water stress had suspended irrigation during flowering, and maintained until the CO2 assimilation rate of plants to morning 9am reached values close to zero, at the resumed irrigation. As from the date irrigation suspension the plants were submitted to the following evaluations: water potential before dawn (ΨAM) and water potential at noon (ΨMD) (MPa); photosynthesis (A; CO2 μmol m-2); stomatal conductance (gs; μmol H2O m-2 s-1), and transpiration (E; mmol H2O m-2 s-1) carried out every day until the photosynthetic rates of plants subjected to water stress is to equalize plants without stress. At the end of the experiment was measured leaf area (cm2), the dry mass of roots, stems, leaves and total (g), the chlorophyll content index near the apex of the leaves and the next leaves the base. Was also determined daily water consumption species (mL). The results grouped the plants into two groups: trapoeraba and mussambê, considered conservative, keeping the high water potential and transpiration, being uncompetitive by water, and crotalária and malva-branca, medium investors, able to reduce the water potential and stomatal aperture values higher, resulting in greater potential for competition for water. And in low water availability conditions, the mauve-white is the most competitive for water, because it can maintain high water consumption levels over timeNão há dúvidas de que a interferência das plantas daninhas causa prejuízos a diversas atividades do ser humano e principalmente aquelas destinadas à agricultura. Por isso, se não forem manejadas adequadamente, podem reduzir a produtividade e a qualidade da produção, devido à competição por luz, nutrientes e principalmente água, que é o recurso mais abundante e, ao mesmo tempo, o mais limitante à produtividade agrícola. O presente trabalho teve como objetivo avaliar o potencial de competição de quatro espécies de plantas daninhas por água. O experimento foi conduzido no esquema fatorial 4 x 2, distribuídos no delineamento experimental em blocos casualizados, com cinco repetições. Foram estudadas as espécies malva-branca (Waltheria indica L.); crotalária (Crotalaria retusa L.); mussambê (Cleome affinis DC.) e trapoeraba (Commelina benghalensis L.)], com dois regimes hídricos (com e sem estresse hídrico). As plantas submetidas ao estresse hídrico tiveram a irrigação suspensa por ocasião do florescimento, e mantida até a taxa de assimilação de CO2 das plantas às 9h da manhã atingisse valores próximos a zero, quando foi retomada a irrigação. A partir da data da suspensão da irrigação as plantas foram submetidas às seguintes avaliações: potencial hídrico antes do amanhecer (ΨAM) e potencial hídrico ao meio dia (ΨMD) (MPa); fotossíntese (A; μmol CO2 m-2); condutância estomática (gs; μmol H2O m-2 s-1), e a transpiração (E; mmol H2O m-2 s-1) realizadas todos os dias até que as taxas de fotossíntese das plantas submetidas ao estresse hídrico se igualassem à das plantas sem estresse. Ao final do experimento foi mensurada a área foliar (cm2), a massa seca das raízes, caules, folhas e total (g), o Índice de conteúdo de clorofila das folhas próximas ao ápice e das folhas próximas a base. Também foi determinado o consumo de água diário das espécies (mL). Os resultados permitiram agrupar as plantas em dois grupos: trapoeraba e mussambê, consideradas como conservadoras, mantendo o potencial hídrico alto e com baixa transpiração, sendo pouco competitivas por água, e crotalária e malva-branca, medianamente investidoras, capazes de reduzir o potencial hídrico e com valores de abertura estomática mais altos, implicando em maior potencial de competição por água. E em condições de baixa disponibilidade de água, a malva-branca é a mais competitiva por água, pois consegue manter altos valores de consumo de água por mais tempoConselho Nacional de Desenvolvimento Científico e TecnológicoUniversidade Federal Rural do Semi-ÁridoBRCentro de Ciências Agrárias - CCAUFERSAPrograma de Pós-Graduação em FitotecniaDombroski, Jeferson Luiz DallabonaCPF:41974999149DOMBROSKI, Jeferson Luiz DallabonaFreitas, Francisco Claudio Lopes deCPF:69935319687http://lattes.cnpq.br/0060989785573065Praxedes, Sidney CarlosCPF:02106448422http://lattes.cnpq.br/6609231229691480Lima, Mayky Francley Pereira de2016-08-12T19:15:30Z2016-02-152015-02-23info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfLIMA, Mayky Francley Pereira de. Ecophysiology of weed under water stress and rehydration. 2015. 81 f. Dissertação (Mestrado em Agricultura Tropical) - Universidade Federal Rural do Semi-Árido, Mossoró, 2015.https://repositorio.ufersa.edu.br/handle/tede/92porCC-BY-SAinfo:eu-repo/semantics/openAccessreponame:Repositório Digital da Universidade Federal Rural do Semi-Árido (RDU)instname:Universidade Federal Rural do Semi-Árido (UFERSA)instacron:UFERSA2023-09-13T23:28:59Zoai:repositorio.ufersa.edu.br:tede/92Repositório Institucionalhttps://repositorio.ufersa.edu.br/PUBhttps://repositorio.ufersa.edu.br/server/oai/requestrepositorio@ufersa.edu.br || admrepositorio@ufersa.edu.bropendoar:2023-09-13T23:28:59Repositório Digital da Universidade Federal Rural do Semi-Árido (RDU) - Universidade Federal Rural do Semi-Árido (UFERSA)false |
dc.title.none.fl_str_mv |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação Ecophysiology of weed under water stress and rehydration |
title |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação |
spellingShingle |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação Lima, Mayky Francley Pereira de weeds Competition for water - weeds Photosynthesis Power rating stomatal conductance Plantas daninhas Competição por água - plantas daninhas Fotossíntese Potencia Condutância estomática CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
title_short |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação |
title_full |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação |
title_fullStr |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação |
title_full_unstemmed |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação |
title_sort |
Ecofisiologia de espécies de plantas daninhas submetidas a estresse hídrico e à reidratação |
author |
Lima, Mayky Francley Pereira de |
author_facet |
Lima, Mayky Francley Pereira de |
author_role |
author |
dc.contributor.none.fl_str_mv |
Dombroski, Jeferson Luiz Dallabona CPF:41974999149 DOMBROSKI, Jeferson Luiz Dallabona Freitas, Francisco Claudio Lopes de CPF:69935319687 http://lattes.cnpq.br/0060989785573065 Praxedes, Sidney Carlos CPF:02106448422 http://lattes.cnpq.br/6609231229691480 |
dc.contributor.author.fl_str_mv |
Lima, Mayky Francley Pereira de |
dc.subject.por.fl_str_mv |
weeds Competition for water - weeds Photosynthesis Power rating stomatal conductance Plantas daninhas Competição por água - plantas daninhas Fotossíntese Potencia Condutância estomática CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
topic |
weeds Competition for water - weeds Photosynthesis Power rating stomatal conductance Plantas daninhas Competição por água - plantas daninhas Fotossíntese Potencia Condutância estomática CNPQ::CIENCIAS AGRARIAS::AGRONOMIA |
description |
There is no doubt that the effect of weed causes damage to various human activities and especially those for agricultural use. Therefore, if not properly handled, can reduce productivity and production quality due to competition for light, nutrients, and especially water, which is the most abundant resource, while the most limiting to agricultural productivity. This study aimed to assess the potential for competition four weed species by water. The experiment was conducted in a factorial 4 x 2, distributed in a randomized complete block design, with five replications. were studied species malva-branca (Waltheria indica L.); crotalária (Crotalaria retusa L.); mussambê (Cleome affinis DC.) and trapoeraba (Commelina benghalensis L.), with two water regimes (with and without water stress). Plants subjected to water stress had suspended irrigation during flowering, and maintained until the CO2 assimilation rate of plants to morning 9am reached values close to zero, at the resumed irrigation. As from the date irrigation suspension the plants were submitted to the following evaluations: water potential before dawn (ΨAM) and water potential at noon (ΨMD) (MPa); photosynthesis (A; CO2 μmol m-2); stomatal conductance (gs; μmol H2O m-2 s-1), and transpiration (E; mmol H2O m-2 s-1) carried out every day until the photosynthetic rates of plants subjected to water stress is to equalize plants without stress. At the end of the experiment was measured leaf area (cm2), the dry mass of roots, stems, leaves and total (g), the chlorophyll content index near the apex of the leaves and the next leaves the base. Was also determined daily water consumption species (mL). The results grouped the plants into two groups: trapoeraba and mussambê, considered conservative, keeping the high water potential and transpiration, being uncompetitive by water, and crotalária and malva-branca, medium investors, able to reduce the water potential and stomatal aperture values higher, resulting in greater potential for competition for water. And in low water availability conditions, the mauve-white is the most competitive for water, because it can maintain high water consumption levels over time |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-02-23 2016-08-12T19:15:30Z 2016-02-15 |
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.uri.fl_str_mv |
LIMA, Mayky Francley Pereira de. Ecophysiology of weed under water stress and rehydration. 2015. 81 f. Dissertação (Mestrado em Agricultura Tropical) - Universidade Federal Rural do Semi-Árido, Mossoró, 2015. https://repositorio.ufersa.edu.br/handle/tede/92 |
identifier_str_mv |
LIMA, Mayky Francley Pereira de. Ecophysiology of weed under water stress and rehydration. 2015. 81 f. Dissertação (Mestrado em Agricultura Tropical) - Universidade Federal Rural do Semi-Árido, Mossoró, 2015. |
url |
https://repositorio.ufersa.edu.br/handle/tede/92 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
CC-BY-SA info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
CC-BY-SA |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido BR Centro de Ciências Agrárias - CCA UFERSA Programa de Pós-Graduação em Fitotecnia |
publisher.none.fl_str_mv |
Universidade Federal Rural do Semi-Árido BR Centro de Ciências Agrárias - CCA UFERSA Programa de Pós-Graduação em Fitotecnia |
dc.source.none.fl_str_mv |
reponame:Repositório Digital da Universidade Federal Rural do Semi-Árido (RDU) instname:Universidade Federal Rural do Semi-Árido (UFERSA) instacron:UFERSA |
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Universidade Federal Rural do Semi-Árido (UFERSA) |
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UFERSA |
institution |
UFERSA |
reponame_str |
Repositório Digital da Universidade Federal Rural do Semi-Árido (RDU) |
collection |
Repositório Digital da Universidade Federal Rural do Semi-Árido (RDU) |
repository.name.fl_str_mv |
Repositório Digital da Universidade Federal Rural do Semi-Árido (RDU) - Universidade Federal Rural do Semi-Árido (UFERSA) |
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repositorio@ufersa.edu.br || admrepositorio@ufersa.edu.br |
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