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EVALUATION OF THE GAS EXCHANGE CHARACTERISTICS OF SELECTED PLANT SPECIES OF UNIVERSITI TUN HUSSEIN ONN MALAYSIA (UTHM)
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  • Audu Yunusa,
  • Alona Cuevas,
  • Jibrin Mohammed,
  • Aisha Idris
Audu Yunusa
Ibrahim badamasi Babangida University
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Alona Cuevas
Universiti Tun Hussein Onn Malaysia
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Jibrin Mohammed
Ibrahim badamasi Babangida University

Corresponding Author:[email protected]

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Aisha Idris
Northwest University Kano
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Abstract

The maximum carboxylation rate (Vcmax) of Rubisco and the maximum electron transport rate (Jmax), light compensation point (LCP), light saturation point (LSP), maximum photosynthesis (Amax), and apparent quantum yield (Aqy) are gas exchange characteristics that are derived from the carbon dioxide (CO2) and light response curves. This characteristics can be affected by the level of CO2 and light received by the plant. Moreover, the characteristics determines the photosynthetic capacity of the plant. The present study evaluates the gas exchange characteristics of selected plant species of UTHM. Photosynthetic carbon dioxide (A\Ci) and light (A/Q) response curves were measured using portable photosynthesis system (LICOR). The results shows that both A/Ci and A/Q curves increases as CO2 and light increases but got to a certain point where the curves become saturated. Spathodea campanulata was having the highest Vcmax (52.14±0.005 µmolCO2 m-2s-1), Jmax (104.461±0.011 µmolCO2 m-2s-1) and Aqy (0.072±0.001 mol CO2 mol-1 photons). The highest LCP was observed in Rhaphis excelsa (69.60±0.067 µmol photons m-2s-1) while the highest LSP was recorded for Costus spicatus (1576.69±0.173 µmol photons m-2s-1). It was concluded that the plants need high light intensity and CO2 to achieve their maximum assimilation rate