PHOTOSYNTHESIS IN EUCALYPTUS UNDER DIFFERENT ENVIRONMENTAL CONDITIONS - DOI: 10.13083/1414-3984/reveng.v23n4p336-345

Authors

  • Sandro Dan Tatagiba
  • José Eduardo Macedo Pezzopane
  • Edvaldo Fialho Reis

DOI:

https://doi.org/10.13083/reveng.v23i4.573

Keywords:

deficiência hídrica, excedente hídrico, fluorescência da clorofila a, trocas gasosas, eucalipto

Abstract

The objective of this study was to evaluate the photosynthetic responses in a clonal plantation of Eucalyptus in two well-defined seasons: a drought due to water deficiency, and a rainy season with excess water in the soil. The experiment was conducted in the area of the company Fibria S.A, located in the region of Itauninhas, district of São Mateus-ES, mounted in a completely randomized design with two treatments (dry and rainy season) and 12 repetitions for gas exchange, chlorophyll a fluorescence and leaf water potential. According to the results, it was found that water stress in the dry season was sufficient to reduce the water content in plant tissues of the plants, causing a reduction in gs, and consequently decrease in A and E. The lower stomatal aperture during dry season contributed to a decrease in carbon assimilation, decreasing the productivity potential of the plants. The water shortage in the dry season caused no damage to the PS II photosynthetic apparatus, as shown by the ratio Fv/Fm, but reduced the efficiency of light energy capture by the PS II antenna complex, reducing the flow of electrons which may have contributed to reduction in A.

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Published

2015-08-28

How to Cite

Tatagiba, S. D., Pezzopane, J. E. M., & Reis, E. F. (2015). PHOTOSYNTHESIS IN EUCALYPTUS UNDER DIFFERENT ENVIRONMENTAL CONDITIONS - DOI: 10.13083/1414-3984/reveng.v23n4p336-345. Engineering in Agriculture, 23(4), 336–345. https://doi.org/10.13083/reveng.v23i4.573

Issue

Vol. 23 No. 4 (2015)

Section

Water and environmental resources

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