Development of experimental structure and influence of high CO2 concentration in maize cro

Engenharia Agrícola

João B. Lopes Da Silva²  Paulo A. Ferreira¹  Eduardo G. Pereira¹  Luís C. Costa¹  Glauco V. Miranda¹ 

[1] ,Universidade Federal do Piauí Engenharia Agrícola

关键词: open-top chambers;    climate change;    Zea mays L;    câmaras de topo aberto;    mudanças climáticas;    Zeamays L;   

DOI  :  10.1590/S0100-69162012000200010

来源: SciELO

【 摘 要 】

Maize is a C4 plant that shows few or no response to high [CO2]. Thus, this study aimed to analyze the photosynthetic rate and yield of maize under high [CO2] and develop open-top chambers (OTC) to create an atmosphere enriched with CO2. The experiment was conducted between October 2008 and March 2009. The OTCs were developed in modular scheme. Measurement of photosynthetic rates, transpiration, stomata conductance, grain yield and dry matter were performed. The experimental design was randomized blocks with four replications and three treatments: P1 - plants grown in OTC with 700 ppm [CO2], P2 - plants grown in OTC with environmental [CO2], and P3 - control, cultivated in open field. The results were analyzed by ANOVA and Tukey's test (Pr< 0.05). The chambers can reduce by 25% the photosynthetically active radiation and increase the air and leaf temperatures. Plants under high [CO2] (P1) showed the highest photosynthetic rates and the lowest stomata conductance and transpiration. The total weight of grains (g) and dry mass of shoots (g) showed no increases for P1, despite their higher photosynthetic rates.

【 授权许可】

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