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Bragantia

Print version ISSN 0006-8705On-line version ISSN 1678-4499

Bragantia vol.47 no.1 Campinas  1988

http://dx.doi.org/10.1590/S0006-87051988000100002 

I. BIOTECNIA E FISIOLOGIA DE PLANTAS

 

Deficiência hídrica simulada nos diferentes estádios de desenvolvimento de um cultivar precoce de soja1

 

Effect of simulated water stress during different stages of the early soybean cultivars Paraná

 

 

Sandra dos Santos Seva NogueiraI, 2; Violeta NagaiII

ISeção de Fisiologia, Instituto Agronômico (IAC), Caixa Postal 28, 13001 Campinas (SP)
II
Seção de Técnica Experimental e Cálculo (IAC)

 

 


RESUMO

Estudou-se o efeito da deficiência hídrica em diferentes estádios do cultivar precoce de soja Paraná. As plantas foram cultivadas em casa de vegetação, em solução nutritiva de Hoagland. A deficiência hídrica foi simulada pela adição de polietilenoglicol (PEG) 6% na solução nutritiva, nos seguintes estádios: vegetativo, florescimento e enchimento do grão. Os resultados mostraram que: (1) a deficiência hídrica nos três estádios diminuiu a produção e o número de vagens e de grãos em relação à testemunha; (2) no período do enchimento do grão diminuiu o peso do grão e a produção, com relação ao estádio vegetativo. Concluiu-se que a deficiência foi mais prejudicial nos estádios reprodutivos, devido à diminuição da produção de grãos.

Termos de indexação: soja, Glycine max (L.) Merrill, deficiência hídrica, produção.


SUMMARY

A greenhouse experiment was carried out to study the effect of simulated water stress during different growth stages on the yield of the early soybean cultivars Paraná, in Campinas, State of São Paulo, Brazil. The water stress was simulated by the addition of PEG (polyetilenoglycol) to the Hoagland nutrient solution where the plants were cultivated, up to three different stages: vegetative period, flowering period and pod filling period. It was observed that water stress during the three periods reduced the grain yield, the seed weight and the seed number. The water stress was more damaging during the reproductive stages for the cultivars studied since it reduced the grain yield.

Index terms: soybean, Glycine max (L.) Merrill, water deficiency, production.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

REFERÊNCIAS BIBLIOGRÁFICAS

BLANCHET, R.; GELFI, N. & BOSCO, M. Relations entre consommation d'eau et production chez divers types variétaux de soja. Annales Agronomiques, 28:261-275, 1977.         [ Links ]

__________; __________; MARTY, J.R. & PUECH, J. Influence de diverses modalités d'alimentation hydrique sur la biologie et la production du soja. Informations Techniques Cetion, 71:12-21, 1980.        [ Links ]

BOYER, J.S. Water deficits and photosynthesis. In: KOZLOWSKI, T.T., ed. Water deficits and plant growth. New York, Academic Press, 1976. v.4, p.153-190.        [ Links ]

GHORASHY, S.R.; PENDLETON, J.W.; PETERS, J.B.; BOYER, J.S. & BURLEIN, J.E. Internal water stress and apparent photosynthesis with soybeans differing in pubescence. Agronomy Journal, 63:674-675, 1971.         [ Links ]

LAGERWERFF, J.W.; OGATA, G & EAGLE, H.E. Control of osmotic pressure of culture solutions with polyethylenoglicol. Science, 133:1486-1487,1961.        [ Links ]

LAWLOR, D.W. Absorption of polyethylenoglicols by plants and their effects on plant growth. New Phytologist, 69:501 -513, 1970.        [ Links ]

RUNGE, E.C.A. & ODELL, R.T. The relation between precipitation, temperature and yield of soybeans in the Agronomy South Farm, Urbana, Illinois. Agronomy Journal, 52:245-247, 1960.        [ Links ]

SHAW, R.H. & LAING, D.R. Moisture stress and plant response. In: PIERRE, W.H.; DIRKMAN, D.; PERK, J. & SHAW, R.H., eds. Plant environment and efficient water use. Wisconsin, American Society of Agriculture and Soil Science Society America, 1966. p.73-94.        [ Links ]

SIONIT, N. & KRAMER, P.J. Effects of water stress during different stages of growth of soybean. Agronomy Journal, 69:274-278, 1977.        [ Links ]

WARDLAW, I.F. The effect of water stress on translocation in relation to photosynthesis and growth. I. Effect during grain development in wheat. Australian Journal of Biological Science, 20:25-39, 1968.        [ Links ]

 

 

Recebido para publicação em 27 de janeiro e aceito em 20 de outubro de 1987.

 

 

1 Trabalho apresentado no IV Seminário Nacional de Pesquisa de Soja, 1986, Porto Alegre.
2 Com bolsa de pesquisa do CNPq.

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