African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6858

Full Length Research Paper

Eucalyptus urocan drought tolerance mechanisms

Fábio Santos Matos
  • Fábio Santos Matos
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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Paula Riselly Candida Oliveira
  • Paula Riselly Candida Oliveira
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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Julia Lobo Ribeiro Anciotti Gil
  • Julia Lobo Ribeiro Anciotti Gil
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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Paulo Vinicius de Sousa
  • Paulo Vinicius de Sousa
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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Gabriel Anselmo Gonçalves
  • Gabriel Anselmo Gonçalves
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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Marcos Paulo Brito Lopes Sousa
  • Marcos Paulo Brito Lopes Sousa
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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Patricia Souza da Silveira
  • Patricia Souza da Silveira
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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Leandro Mariano da Silva
  • Leandro Mariano da Silva
  • State University of Goiás, Campus Ipameri, GO Highway 330, km 241, Beltway.
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  •  Received: 19 February 2016
  •  Accepted: 01 April 2016
  •  Published: 05 May 2016

Abstract

The present study was designed to identify strategies for tolerance to hydric deficit in Eucalyptus urocan seedlings. The experiment was conducted in a green house with 100% solar radiation capture. The completely randomized block design was used with five treatments (plants irrigated daily with water corresponding to 25, 50, 75, 100 and 125% daily evapotranspiration) and five replications. 120-day-old E. urocan seedlings (hybrid result from the crossing between Eucalyptus Urophylla x Eucalyptus camaldulensis) were planted in pots containing 8 L of substrate composed by oxisol, sand and muck at 3:1:0.5 ratio, respectively. The seedlings were irrigated with different volumes of water for 13 days and then analyzed. Under hydric deficit condition, E. urocan plants showed significant investment in the root system, reduced the breathing rate and kept enough turgor for growth. E. urocan plants at initial growth stage are tolerant to hydric deficit and show dehydration delay as a strategy to tolerate drought.

Key words: Hydric deficit, silviculture, initial growth.