Cotton response to mepiquat chloride and temperature

Detalhes bibliográficos
Autor(a) principal: Rosolem, Ciro Antonio [UNESP]
Data de Publicação: 2013
Outros Autores: Oosterhuis, Derrick M., Souza, Fabio S. de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S0103-90162013000200004
http://hdl.handle.net/11449/5987
Resumo: Gibberellin inhibitor growth regulators are used for cotton (Gossypium hirsutum L.) canopy manipulation to avoid excess growth and yield losses. However, under temperatures below or over the optimum for cotton production the effect of mepiquat chloride (MC) has not always been significant. In this experiment, cotton plants were grown in growth chambers to study the response to MC as affected by temperature and to determine if an increase in dose could overcome the temperature effects. Mepiquat chloride was applied at rates of 0, 15 and 30 g ai ha-1 at the pinhead square stage. Plants were then grown under three temperature regimes: 25/15 °C, 32/22 °C, and 39/29 °C (day/night temperatures) for 51 days. Higher temperatures increased plant height, reproductive branches, fruit number, fruit abscission, and photosynthesis per unit area, but decreased leaf area and chlorophyll. The largest effect of MC on plant height was observed when the daily temperature was 32 °C, with nights of 22 °C, which was also best for plant growth. High temperatures not only decreased the effectiveness of MC on plant height control, but also caused lower dry matter and fruit number per plant. Low temperatures (25/15 ºC) decreased cotton growth and fruit retention, but a higher concentration of MC was required per unit of growth reduction as compared with 32/22 ºC. At high temperatures, the rate of MC to be applied must be disproportionately increased, because either plant growth is impaired by high temperature lessening the effect of MC, or degradation of MC within the plant is too rapid.
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spelling Cotton response to mepiquat chloride and temperatureplant growth regulatorcotton growthphotosynthesisGibberellin inhibitor growth regulators are used for cotton (Gossypium hirsutum L.) canopy manipulation to avoid excess growth and yield losses. However, under temperatures below or over the optimum for cotton production the effect of mepiquat chloride (MC) has not always been significant. In this experiment, cotton plants were grown in growth chambers to study the response to MC as affected by temperature and to determine if an increase in dose could overcome the temperature effects. Mepiquat chloride was applied at rates of 0, 15 and 30 g ai ha-1 at the pinhead square stage. Plants were then grown under three temperature regimes: 25/15 °C, 32/22 °C, and 39/29 °C (day/night temperatures) for 51 days. Higher temperatures increased plant height, reproductive branches, fruit number, fruit abscission, and photosynthesis per unit area, but decreased leaf area and chlorophyll. The largest effect of MC on plant height was observed when the daily temperature was 32 °C, with nights of 22 °C, which was also best for plant growth. High temperatures not only decreased the effectiveness of MC on plant height control, but also caused lower dry matter and fruit number per plant. Low temperatures (25/15 ºC) decreased cotton growth and fruit retention, but a higher concentration of MC was required per unit of growth reduction as compared with 32/22 ºC. At high temperatures, the rate of MC to be applied must be disproportionately increased, because either plant growth is impaired by high temperature lessening the effect of MC, or degradation of MC within the plant is too rapid.UNESP FCA Depto. de Produção VegetalUniversity of Arkansas Crop, Soil, and Environmental SciencesIAPARUNESP FCA Depto. de Produção VegetalUniversidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ)Universidade Estadual Paulista (Unesp)University of Arkansas Crop, Soil, and Environmental SciencesIAPARRosolem, Ciro Antonio [UNESP]Oosterhuis, Derrick M.Souza, Fabio S. de2014-05-20T13:21:02Z2014-05-20T13:21:02Z2013-04-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article82-87application/pdfhttp://dx.doi.org/10.1590/S0103-90162013000200004Scientia Agricola. São Paulo - Escola Superior de Agricultura Luiz de Queiroz, v. 70, n. 2, p. 82-87, 2013.0103-9016http://hdl.handle.net/11449/598710.1590/S0103-90162013000200004S0103-90162013000200004WOS:000316764500004S0103-90162013000200004.pdf57207758732595280000-0003-2001-0874SciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengScientia Agricola0,578info:eu-repo/semantics/openAccess2024-04-30T15:56:16Zoai:repositorio.unesp.br:11449/5987Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:03:48.703904Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Cotton response to mepiquat chloride and temperature
title Cotton response to mepiquat chloride and temperature
spellingShingle Cotton response to mepiquat chloride and temperature
Rosolem, Ciro Antonio [UNESP]
plant growth regulator
cotton growth
photosynthesis
title_short Cotton response to mepiquat chloride and temperature
title_full Cotton response to mepiquat chloride and temperature
title_fullStr Cotton response to mepiquat chloride and temperature
title_full_unstemmed Cotton response to mepiquat chloride and temperature
title_sort Cotton response to mepiquat chloride and temperature
author Rosolem, Ciro Antonio [UNESP]
author_facet Rosolem, Ciro Antonio [UNESP]
Oosterhuis, Derrick M.
Souza, Fabio S. de
author_role author
author2 Oosterhuis, Derrick M.
Souza, Fabio S. de
author2_role author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
University of Arkansas Crop, Soil, and Environmental Sciences
IAPAR
dc.contributor.author.fl_str_mv Rosolem, Ciro Antonio [UNESP]
Oosterhuis, Derrick M.
Souza, Fabio S. de
dc.subject.por.fl_str_mv plant growth regulator
cotton growth
photosynthesis
topic plant growth regulator
cotton growth
photosynthesis
description Gibberellin inhibitor growth regulators are used for cotton (Gossypium hirsutum L.) canopy manipulation to avoid excess growth and yield losses. However, under temperatures below or over the optimum for cotton production the effect of mepiquat chloride (MC) has not always been significant. In this experiment, cotton plants were grown in growth chambers to study the response to MC as affected by temperature and to determine if an increase in dose could overcome the temperature effects. Mepiquat chloride was applied at rates of 0, 15 and 30 g ai ha-1 at the pinhead square stage. Plants were then grown under three temperature regimes: 25/15 °C, 32/22 °C, and 39/29 °C (day/night temperatures) for 51 days. Higher temperatures increased plant height, reproductive branches, fruit number, fruit abscission, and photosynthesis per unit area, but decreased leaf area and chlorophyll. The largest effect of MC on plant height was observed when the daily temperature was 32 °C, with nights of 22 °C, which was also best for plant growth. High temperatures not only decreased the effectiveness of MC on plant height control, but also caused lower dry matter and fruit number per plant. Low temperatures (25/15 ºC) decreased cotton growth and fruit retention, but a higher concentration of MC was required per unit of growth reduction as compared with 32/22 ºC. At high temperatures, the rate of MC to be applied must be disproportionately increased, because either plant growth is impaired by high temperature lessening the effect of MC, or degradation of MC within the plant is too rapid.
publishDate 2013
dc.date.none.fl_str_mv 2013-04-01
2014-05-20T13:21:02Z
2014-05-20T13:21:02Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/S0103-90162013000200004
Scientia Agricola. São Paulo - Escola Superior de Agricultura Luiz de Queiroz, v. 70, n. 2, p. 82-87, 2013.
0103-9016
http://hdl.handle.net/11449/5987
10.1590/S0103-90162013000200004
S0103-90162013000200004
WOS:000316764500004
S0103-90162013000200004.pdf
5720775873259528
0000-0003-2001-0874
url http://dx.doi.org/10.1590/S0103-90162013000200004
http://hdl.handle.net/11449/5987
identifier_str_mv Scientia Agricola. São Paulo - Escola Superior de Agricultura Luiz de Queiroz, v. 70, n. 2, p. 82-87, 2013.
0103-9016
10.1590/S0103-90162013000200004
S0103-90162013000200004
WOS:000316764500004
S0103-90162013000200004.pdf
5720775873259528
0000-0003-2001-0874
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Scientia Agricola
0,578
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 82-87
application/pdf
dc.publisher.none.fl_str_mv Universidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ)
publisher.none.fl_str_mv Universidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ)
dc.source.none.fl_str_mv SciELO
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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