Photosynthetic and growth responses of <i>Theobroma cacao</i> L. clones to waterlogging

Photosynthetic and growth responses of <i>Theobroma cacao</i> L. clones to waterlogging

Authors

  • Bruna Carmo Rehem Universidade Estadual de Santa Cruz
  • Alex-Alan Furtado de Almeida Universidade Estadual de Santa Cruz
  • Marcelo Schramm Mielke Universidade Estadual de Santa Cruz
  • Fábio Pinto Gomes Universidade Estadual de Santa Cruz
  • Raul René Valle CEPLAC

Keywords:

Cacao, Leaf gas exchange, Macronutrients, Stomatal conductance, Submergence

Abstract

Six high yielding cacao clones (CCN-10, CP-49, CP-06, CEPEC-2007, CEPEC-2008, and PS-1319) were evaluated for photosynthetic performance, growth, and leaf nutrient concentration in response to 45 days of root waterlogging. Submergence reduced net CO2 assimilation (A). The highest A value (6.8 mmol CO2 m–2•s–1) was observed in the control plants of CCN-10 at 15 days after submergence, and CEPEC-2007 and PS-1319 30 at days of submergence. Stomatal conductances (gs) were 115 and 102 mmol H2O m–2•s–1 for CP-49 and CCN-10, respectively. Fifteen days of submergence increased the leaf intercellular (Ci) to atmospheric CO2 concentration (Ca) ratio (Ci/Ca) and decreased gs with CEPEC-2008 and PS-1319 being the most sensitive clones. CCN-10, CP-49, and CP-06 had relatively higher mean values of A and gs after waterlogging than other clones. All CEPEC-2008 and PS-1319 plants died after 35 days of waterlogging. The surviving clones had lower root, leaf and total plant dry weight, leaf area, leaf biomass ratio, relative growth rate, and leaf number, with the exception of clones CP-06 and CEPEC-2007. Waterlogging also decreased leaf concentrations of N, P, K, and Mg in all clones, except N in CEPEC-2007. The CCN-10 clone was the most tolerant to waterlogging with the least effects of waterlogging on leaf gas exchange. Clones CP-49, CP-06, and CEPEC-2007 showed intermediate tolerance, while CEPEC-2008 and PS-1319 were highly sensitive.

Author Biographies

Bruna Carmo Rehem, Universidade Estadual de Santa Cruz

DCB

Alex-Alan Furtado de Almeida, Universidade Estadual de Santa Cruz

DCB

Marcelo Schramm Mielke, Universidade Estadual de Santa Cruz

DCB

Fábio Pinto Gomes, Universidade Estadual de Santa Cruz

DCB

Raul René Valle, CEPLAC

CEPEC

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Published

26-12-2010

How to Cite

Rehem, B. C., Almeida, A.-A. F. de, Mielke, M. S., Gomes, F. P., & Valle, R. R. (2010). Photosynthetic and growth responses of <i>Theobroma cacao</i> L. clones to waterlogging. Journal of Tropical Agriculture, 48(2), 17–22. Retrieved from https://jtropag.kau.in/index.php/ojs2/article/view/217

Issue

Section

Regular papers

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