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Photosynthetica

, Volume 52, Issue 1, pp 16–21 | Cite as

Leaf gas exchange in species of the Theobroma genus

  • A. -A. F. Almeida
  • F. P. Gomes
  • R. P. Araujo
  • R. C. Santos
  • R. R. Valle
Original Paper

Abstract

Species of the Theobroma genus are primarily known by their commercially valuable seeds, especially, T. cacao is one of the most important tropical perennial crops. Beside T. grandiflorum, T. bicolor, and T. angustifolium, T. cacao is the only species of the genus that has been better studied to obtain physiologically relevant information. The main objective of this work was to evaluate the leaf gas exchange in seedlings of seven species of the Theobroma genus, seeking to identify characteristics that could be used in T. cacao breeding programmes. The study was realized under greenhouse conditions using six-month-old seedlings, in which net photosynthetic rate (P N), stomatal conductance (g s), transpiration (E), as well as parameters derived from light curves (P N vs. photosynthetically active radiation) were evaluated. T. cacao, along with T. microcarpum, showed the lowest values of P N, g s, and E, while the highest values were presented by T. speciosum, which showed higher saturation irradiance and lower intrinsic and instantaneous water-use efficiencies, being considered the species less conservative in water use. Therefore, the parameters shown by the different evaluated species could serve to design T. cacao genotypes, through introgression of genes for specific environments such as the cabruca system widespread in southern Bahia, Brazil.

Additional key words

light-response curves photosynthesis stomatal conductance transpiration water-use efficiency 

Abbreviations

E

transpiration

gs

stomatal conductance to water vapor

gs/VPD

stomatal conductance to water vapor normalized for leaf-to-air vapor pressure deficit

Ic

compensation irradiance

Is

saturation irradiance

PAR

photosynthetically active radiation

PGmax

maximum rate of gross photosynthetic rate at saturation irradiance

PN

net photosynthetic rate per leaf area unit

RD

dark respiration rate

VPD

leaf-to-air vapor pressure deficit

WUE (=PN/E)

instantaneous water-use efficiency

WUEi (= PN/gs)

intrinsic water-use efficiency

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • A. -A. F. Almeida
    • 1
  • F. P. Gomes
    • 1
  • R. P. Araujo
    • 1
  • R. C. Santos
    • 2
  • R. R. Valle
    • 1
    • 2
  1. 1.Departamento de Ciências BiológicasUniversidade Estadual de Santa Cruz (DCB/UESC)Ilhéus, BABrazil
  2. 2.Centro de Pesquisas do CacauComissão Executiva do Plano da Lavoura Cacaueira (CEPEC/CEPLAC)Itabuna, BABrazil

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