Cotton response to mepiquat chloride and temperature

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dc.contributor.authorRosolem, Ciro Antonio [UNESP]
dc.contributor.authorOosterhuis, Derrick M.
dc.contributor.authorSouza, Fabio S. de
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Arkansas Crop, Soil, and Environmental Sciences
dc.contributor.institutionIAPAR
dc.date.accessioned2014-05-20T13:21:02Z
dc.date.available2014-05-20T13:21:02Z
dc.date.issued2013-04-01
dc.description.abstractGibberellin 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.en
dc.description.affiliationUNESP FCA Depto. de Produção Vegetal
dc.description.affiliationUniversity of Arkansas Crop, Soil, and Environmental Sciences
dc.description.affiliationIAPAR
dc.description.affiliationUnespUNESP FCA Depto. de Produção Vegetal
dc.format.extent82-87
dc.identifierhttp://dx.doi.org/10.1590/S0103-90162013000200004
dc.identifier.citationScientia Agricola. São Paulo - Escola Superior de Agricultura Luiz de Queiroz, v. 70, n. 2, p. 82-87, 2013.
dc.identifier.doi10.1590/S0103-90162013000200004
dc.identifier.fileS0103-90162013000200004.pdf
dc.identifier.issn0103-9016
dc.identifier.lattes5720775873259528
dc.identifier.orcid0000-0003-2001-0874
dc.identifier.scieloS0103-90162013000200004
dc.identifier.urihttp://hdl.handle.net/11449/5987
dc.identifier.wosWOS:000316764500004
dc.language.isoeng
dc.publisherUniversidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ)
dc.relation.ispartofScientia Agricola
dc.relation.ispartofsjr0,578
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectplant growth regulatoren
dc.subjectcotton growthen
dc.subjectphotosynthesisen
dc.titleCotton response to mepiquat chloride and temperatureen
dc.typeArtigo
unesp.author.lattes5720775873259528[1]
unesp.author.orcid0000-0003-2001-0874[1]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agronômicas, Botucatupt
unesp.departmentProdução e Melhoramento Vegetal - FCApt

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Botucatu - FCA - Faculdade de Ciências Agronômicas