| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Gas exchange rates, plant height, yield components, and productivity of upland rice as affected by plant regulators
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| Autores: |
Alvarez,Rita de Cássia Félix
Crusciol,Carlos Alexandre Costa
Nascente,Adriano Stephan
Rodrigues,João Domingos
Habermann,Gustavo
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| Data: |
2012-10-01
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| Ano: |
2012
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| Palavras-chave: |
Oryza sativa
Net photosynthesis
Stomatal conductance
Transpiration
Water-use efficiency
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| Resumo: |
The objective of this work was to evaluate gas exchange rates, plant height, yield components, and productivity of upland rice, as affected by type and application time of plant growth regulators. A randomized block design, in a 4x2 factorial arrangement, with four replicates was used. Treatments consisted of three growth regulators (mepiquat chloride, trinexapac-ethyl, and paclobutrazol), besides a control treatment applied at two different phenological stages: early tillering or panicle primordial differentiation. The experiment was performed under sprinkler-irrigated field conditions. Net CO2 assimilation, stomatal conductance, plant transpiration, and water-use efficiency were measured four times in Primavera upland rice cultivar, between booting and milky grain phenophases. Gas exchange rates were neither influenced by growth regulators nor by application time. There was, however, interaction between these factors on the other variables. Application of trinexapac-ethyl at both tillering and differentiation stages reduced plant height and negatively affected yield components and rice productivity. However, paclobutrazol and mepiquat chloride applied at tillering, reduced plant height without affecting rice yield. Mepiquat chloride acted as a growth stimulator when applied at the differentiation stage, and significantly increased plant height, panicle number, and grain yield of upland rice.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2012001000007
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/S0100-204X2012001000007
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.47 n.10 2012
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| Direitos: |
info:eu-repo/semantics/openAccess
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