Leaf concentrations of nitrogen and phosphorus in phaseolus vulgaris l. Plants under high CO2 concentration and drought stress

Engenharia Agrícola

João B. L. Da Silva²  Paulo A. Ferreira¹  Flávio Justino¹  Luanna C. Pires²  Amanda S. Toledo¹ 

[1] ,UFSB Instituto de Humanidades, Artes e Ciências Teixeira de Freitas BA

关键词: beans;    mineral nutrition;    photosynthesis;    climatic changes;    Phaseolus vulgaris L.;    nutrição mineral;    fotossíntese;    mudanças climáticas;   

DOI  :  10.1590/S0100-69162014000500012

来源: SciELO

【 摘 要 】

This study aims to evaluate the leaf concentration of nitrogen and phosphorus correlated to the production of photoassimilates in beans plants (Phaseolus vulgaris L.) under high [CO2] and drought stress. The experiment was conducted in Viçosa (Brazil), during the period from April to July 2009, by using open-top chambers equipped with CO2 injection system. The drought stress was applied, through the irrigation suspension, during the period from flowering to maturation. The experimental design was randomized blocks in split-plot scheme with four replication, where the plots with plants grown in [CO2] of 700 mg L-1 and [CO2] environment of 380 mg L-1 and the subplots with plants with and without drought stress. The results were submitted to ANOVA and Tukey test (p < 0.05). In the plants under high [CO2] with and without drought stress, the photosynthetic rate increased by 59%, while the dry matter presented an increment of 20% in the plants under high [CO2] without drought stress. Reductions in [N] and [P] occurred in plants grown under high [CO2], resulting in greater efficiency in nitrogen use for photosynthesis. The high [CO2] increase only the total dry matter and not the total mass of grains. The drought stress reduces the dry matter and mass of grain, even at high [CO2].

【 授权许可】

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