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Bragantia

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

Bragantia vol.53 no.2 Campinas  1994

http://dx.doi.org/10.1590/S0006-87051994000200003 

I. BIOTECNOLOGIA, FISIOLOGIA DE PLANTAS E FITOQUÍMICA

 

Trocas gasosas e condutância estomática em três espécies de gramíneas1

 

Gas exchanges and stomatal conductance on three gramineous species

 

 

Eduardo Caruso MachadoI, II; Ana Maria Magalhães Andrade LagôaI, II

ISeção de Fisiologia, Instituto Agronômico, Caixa Postal 28, 13001-970 Campinas (SP)
IICom bolsa do CNPq

 

 


RESUMO

Avaliou-se, sob condições naturais e sem deficiência hídrica, o comportamento diário das taxas de assimilação de CO2 (A) e de transpiração (E), a condutância estomática (g) e a eficiência fotossintética do uso de água (E/A) em milho (C4), arroz (C3) e trigo (C3). Nas três espécies, a curva de resposta de A em função da irradiância (I), apresentou a forma de uma hipérbole retangular, porém em milho não houve saturação lumínica. A resposta de g em relação a I apresentou a mesma forma, respondendo E linearmente, nas três espécies. Em relação à variação de g, a curva de resposta de A também mostrou a forma de hipérbole retangular, enquanto E respondeu linearmente. Devido à resposta diferencial de A e de E, tanto em função de I como de g, a razão E/A aumentou com o aumento de I. As espécies C3 (arroz e trigo) revelaram valores maiores de E/A que a C4 (milho), em todos os níveis de I e valores de g, indicando melhor adaptabilidade da C4 na limitação de abertura estomática.

Termos de indexação: arroz, Oryza sativa L., milho, Zea mays L., trigo, Triticum aestivum L., fotossíntese, transpiração.


ABSTRACT

Under natural condition and without water deficit, assimilation of CO2 (A) and transpiration (E) rates, stomatal conductance (g) and photosyntetic efficiency of water use (E/A), were monitored daily on maize (C4), rice (C3) and wheat (C3). In all species, the shape of response curves of A in function of irradiance (I), was a retangular hyperbole. However, luminic saturation was not observed in maize. Stomatal conductance response curve in function of I was also a retangular hyperbole, while E was linear in all species. Due to differential response of A and E, as a function of I as well as g, the ratio E/A was increased with the increase of I. The C3 species (rice and wheat) showed higher values of E/A than the C4 specie (maize), in all levels of I and g, showing the better C4 adaptation when stomatal limitation aperture occurs.

Index terms: rice, Oryza sativa L., maize, Zea mays L., wheat, Triticum aestivum L., photosynthesis, transpiration.


 

 

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Recebido para publicação em 23 de setembro e aceito em 30 de novembro de 1994.

 

 

1 Trabalho parcialmente financiado pelo CNPq.

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