Data/hora: 10/06/2024 02:43:51

Biblioteca(s): | Embrapa Soja; Embrapa Unidades Centrais.
Data corrente: | 16/09/2010
Data da última atualização: | 31/10/2017
Autoria: | RAKOCEVIC, M.; NEUMAIER, N.; OLIVEIRA, G. M. de; NEPOMUCENO, A. L.; FARIAS, J. R. B.
Afiliação: | MIROSLAVA RAKOCEVIC, IAPAR; NORMAN NEUMAIER, CNPSO; GUSTAVO MIGLIORINI DE OLIVEIRA, UEL; ALEXANDRE LIMA NEPOMUCENO, CNPSO; JOSE RENATO BOUCAS FARIAS, CNPSO.
Título: | Heliotropic responses of soybean cultivars at three phenological stages and under two water regimes.
Título original: | Respostas heliotrópicas de cultivares de soja em três estádios fenológicos e dois regimes hídricos.
Ano de publicação: | 2010
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 45, n. 7, p. 661-670, jul. 2010.
DOI: | 10.1590/S0100-204X2010000700005
Idioma: | Inglês
Conteúdo: | The objectives of this work were to determine the heliotropic movements of the upper trifoliates for two soybean cultivars, BR 16 and Embrapa 48, during a daily cycle, in three phenological stages and two water regimes, and to estimate the impact of irrigation and daily leaflet movements on agronomic characteristics and grain yield. Heliotropic movements were studied in three phenological stages: V4?V6, V7?V10, and R5 in irrigated and non-irrigated plots. For each stage, the leaflet elevation and azimuth were measured hourly. Under a low (V4?V6 stage) and mid (V7?V10 stage) leaf area index (LAI) the diaheliotropism was slightly more frequent and intensive in non-irrigated than in irrigated plants, only at early morning and late afternoon hours. At R5 stage (high LAI) the paraheliotropism of superior trifoliates was predominant and more intensive in non-irrigated plants. The heliotropic movements are correlated to carbon gain, but not to environment (light intensity or temperature), for measurements at 11h. 'Embrapa 48' expresses greater paraheliotropism than 'BR 16' at high LAI, while 'BR 16' displays lower heliotropic plasticity under irrigation. In spite of significant heliotropic differences, genotype and water availability treatments did not influence the final grain yield.
Palavras-Chave: | Cosseno; Diaheliotropism; Diaheliotropismo; Indice de área foliar; Paraheliotropism; Paraheliotropismo.
Thesagro: | Fisiologia vegetal; Glycine Max; Irrigação; Soja.
Thesaurus Nal: | Irrigation; Leaf area index; Plant physiology; Soybeans.

Categoria do assunto:

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F Plantas e Produtos de Origem Vegetal

URL:

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/30390/1/Mirolasva-Pesq.-agropec.-bras.pdf
http://ainfo.cnptia.embrapa.br/digital/bitstream/item/105845/1/Heliotropic-responses.pdf

Registro original: | Embrapa Soja (CNPSO)

Exemplares:

CNPSO - (31239-1) - UPC - AP - PP -  -  -  - DIS
AI-SEDE - (48294-1) - UPC - AP - PP - 630.72081 - P474 -  - DIS