Influences of two CO2 concentrations and water availability on bean crop

Engenharia Agrícola

João B. L. Da Silva²  Paulo A. Ferreira¹  Luanna C. Pires¹  Eduardo G. Pereira¹  José E. S. Carneiro¹ 

[1] ,Universidade Federal do Piauí

关键词: photosynthesis;    Phaseolus vulgaris L.;    climate changes;    fotossíntese;    Phaseolus vulgaris L.;    mudanças climáticas;   

DOI  :  10.1590/S0100-69162013000400012

来源: SciELO

【 摘 要 】

This study was carried out to determine some physiological and phenological responses of the bean under high [CO2] and drought stress. The experiment was conducted from April to July 2009 in Viçosa, Brazil. The open-top chambers were used to enrich the air with CO2, whereas the drought stress was applied between the flowering and the ripening. The randomized block design was used, with four replicates in the subplots. The following plots were [CO2] at 700ppm (F1) and [CO2] environmental (F2) and the subplots were well watering (S1) and drought stress (S2). The results were subjected to Anova and the Tukey test (P < 0.05). For the treatments F1S1 and F1S2 the photosynthetic rate showed increments of 59% and the transpiration reduction of 12%. The yield, leaf temperature and stomatal conductance were not significant different to high [CO2], different from the dry matter, who showed increment of 20% (F1S1) and the water use efficiency who showed increase of 90% for high [CO2]. The osmotic potential was lower in plants under drought stress (F2S2 and F1S2), followed by plants under high [CO2] (F1S1). Despite the increment in photosynthesis, high [CO2] does not guarantee higher yield.

【 授权许可】

CC BY   
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