Eficiéncia fotosintética y de uso del agua por malezas

AUTOR(ES)

Aspiazú, I., Sediyama, T., Ribeiro Jr., J.I., Silva, A.A., Concenco, G., Galon, L., Ferreira, E.A., Silva, A.F., Borges, E.T., Araujo, W.F.

FONTE

Planta Daninha

DATA DE PUBLICAÇÃO

2010

RESUMO

The objective of this study was to evaluate characteristics associated with the photosynthetic efficiency and water use of weed species. Treatments were composed by the species Bidens pilosa, Commelina benghalensis and Brachiaria plantaginea, sown individually in the experimental units. The experimental design was in randomized blocks in a 3 x 4 factorial, with three repetitions. Characteristics associated with water use - transpiratory rate (E), stomatal conductance (Gs), vapor pressure in the substomatal chamber (Ean) and water use efficiency (WUE) - as well as photosynthesis - internal leaf CO2 concentration (Ci), CO2 consumed during the evaluation (ΔC),leaves average temperature at evaluation time (Tleaf) and photosynthetic rate (A) - were evaluated. B. plantaginea showed lower E, lower WUE and higher A and Ci, differing from the other involved species. B. pilosa showed lower values of WUE, A and T when compared to the other species. According to the results, it can be concluded that B. plantaginea was more efficient in characteristics related to the photosynthesis, i.e., more efficient use of light. B. pilosa was more efficient in characteristics related to water use.

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