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Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.

Detalhes bibliográficos
Autor(a) principal: MAGALHAES, P. C.
Data de Publicação: 1984
Tipo de documento: Tese
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/474162
Resumo: Source-sink relationhips is a controversial topic. Some workers assert that grain yield in corn is limited by availability of assimilate during the grain filling period. Others have reported the sink size as the limiting factor. In this research, I studied the effects of assimilate availabilibty on kernel growth rate and final weight by investigating the effects of altered source/sink ratios on soluble sugars, starch and nitrogen content in plant parts of maize. Special attention was given to plant's compensatory response such as soluble carbohydrates and nitrogen redistribution to the grain. Two genotypes: M14 x W64A and Pionner-brand '3780', were grown in field plots at St. Paul, Mn in 1982. The treatment were arranged in a split plot manner in a randomized complete block design of four replicates. The alterations of source/sink ratio consisted of partial kernel removal (removing the tip half of the ear), and thinning by a 50% plant population reduction imposed before and after the onset of linear growth (6 days and 24 days after mid-silking, respectively). M14 x W64A responded to early thinning, as indicated by an extended grain filling period, increased starch content of the kernels and greater final kernel weight. However, kernel growth rate, number of kernels per ear and kernel soluble sugars content were not affected. Thinning and partial kernel removel on both dates increased internode dry weight and soluble sugar content. Kernels removal early enhanced the nitrogen content in the internodes and (...)
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spelling Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.AssimilacaoCarboidratosMaizeGrainFisiologiaGrãoMilhoNitrogênioZea MayscarbohydratesphysiologynitrogenSource-sink relationhips is a controversial topic. Some workers assert that grain yield in corn is limited by availability of assimilate during the grain filling period. Others have reported the sink size as the limiting factor. In this research, I studied the effects of assimilate availabilibty on kernel growth rate and final weight by investigating the effects of altered source/sink ratios on soluble sugars, starch and nitrogen content in plant parts of maize. Special attention was given to plant's compensatory response such as soluble carbohydrates and nitrogen redistribution to the grain. Two genotypes: M14 x W64A and Pionner-brand '3780', were grown in field plots at St. Paul, Mn in 1982. The treatment were arranged in a split plot manner in a randomized complete block design of four replicates. The alterations of source/sink ratio consisted of partial kernel removal (removing the tip half of the ear), and thinning by a 50% plant population reduction imposed before and after the onset of linear growth (6 days and 24 days after mid-silking, respectively). M14 x W64A responded to early thinning, as indicated by an extended grain filling period, increased starch content of the kernels and greater final kernel weight. However, kernel growth rate, number of kernels per ear and kernel soluble sugars content were not affected. Thinning and partial kernel removel on both dates increased internode dry weight and soluble sugar content. Kernels removal early enhanced the nitrogen content in the internodes and (...)Dissertação (Mestrado) - University of Minnesota, Minneapolis.PAULO CESAR MAGALHAES, CNPMS.MAGALHAES, P. C.2011-04-10T11:11:11Z2011-04-10T11:11:11Z1997-03-2119842017-05-25T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis34 p.1984.http://www.alice.cnptia.embrapa.br/alice/handle/doc/474162enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-16T01:02:02Zoai:www.alice.cnptia.embrapa.br:doc/474162Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-16T01:02:02falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-16T01:02:02Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
title Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
spellingShingle Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
MAGALHAES, P. C.
Assimilacao
Carboidratos
Maize
Grain
Fisiologia
Grão
Milho
Nitrogênio
Zea Mays
carbohydrates
physiology
nitrogen
title_short Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
title_full Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
title_fullStr Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
title_full_unstemmed Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
title_sort Effects of assimilate enhancement on grain filling and carbohydrate and nitrogen partitioning in maize.
author MAGALHAES, P. C.
author_facet MAGALHAES, P. C.
author_role author
dc.contributor.none.fl_str_mv PAULO CESAR MAGALHAES, CNPMS.
dc.contributor.author.fl_str_mv MAGALHAES, P. C.
dc.subject.por.fl_str_mv Assimilacao
Carboidratos
Maize
Grain
Fisiologia
Grão
Milho
Nitrogênio
Zea Mays
carbohydrates
physiology
nitrogen
topic Assimilacao
Carboidratos
Maize
Grain
Fisiologia
Grão
Milho
Nitrogênio
Zea Mays
carbohydrates
physiology
nitrogen
description Source-sink relationhips is a controversial topic. Some workers assert that grain yield in corn is limited by availability of assimilate during the grain filling period. Others have reported the sink size as the limiting factor. In this research, I studied the effects of assimilate availabilibty on kernel growth rate and final weight by investigating the effects of altered source/sink ratios on soluble sugars, starch and nitrogen content in plant parts of maize. Special attention was given to plant's compensatory response such as soluble carbohydrates and nitrogen redistribution to the grain. Two genotypes: M14 x W64A and Pionner-brand '3780', were grown in field plots at St. Paul, Mn in 1982. The treatment were arranged in a split plot manner in a randomized complete block design of four replicates. The alterations of source/sink ratio consisted of partial kernel removal (removing the tip half of the ear), and thinning by a 50% plant population reduction imposed before and after the onset of linear growth (6 days and 24 days after mid-silking, respectively). M14 x W64A responded to early thinning, as indicated by an extended grain filling period, increased starch content of the kernels and greater final kernel weight. However, kernel growth rate, number of kernels per ear and kernel soluble sugars content were not affected. Thinning and partial kernel removel on both dates increased internode dry weight and soluble sugar content. Kernels removal early enhanced the nitrogen content in the internodes and (...)
publishDate 1984
dc.date.none.fl_str_mv 1984
1997-03-21
2011-04-10T11:11:11Z
2011-04-10T11:11:11Z
2017-05-25T11:11:11Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv 1984.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/474162
identifier_str_mv 1984.
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/474162
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 34 p.
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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