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Comparative Gas Exchange of Ulmus crassifolia (Cedar Elm, Ulmaceae) and Ungnadia speciosa (Mexican Buckey, Sapindaceae) at Ambient and Elevated Levels of Light, CO2 and Temperature

DOI: 10.4236/ajps.2023.146047, PP. 691-709

Keywords: Light Response, Gas Exchange, Photosynthesis, Respiration, Water Use Efficiency

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Abstract:

Ulmus crassifolia Nutt. (Cedar elm, Ulmaceae) is a tree found in central and east Texas, northern Mexico, east to Florida, and north to southern Missouri and Oklahoma. Ungnadia speciosa Endl. (Mexican-buckeye, Sapindaceae) is a shrub or small tree found in woodlands and savannas of central and western Texas, southern New Mexico and northern Mexico. In central Texas, both species are found in Juniperus ashei/Quercus virginiana woodlands or savannas or also at low density in inter-canopy grassland gaps or patches. Environmental conditions in this area are stressful because of shallow soils, high summer temperatures, and inconsistent low rainfall. Currently, both species have a low density in these areas, and Ulmus crassifolia is usually a tree, while Ungnadia speciosa is a woody understory shrub. This study suggests U. crassifolia and U. speciosa are tolerant or intermediate species, with juveniles starting in shade. Maximum photosynthetic rate (Amax), dark respiration (Rd), intercellular CO2, light saturation (Lsp) and water use efficiency significantly increased when light levels and CO2 concentrations were elevated for both species, but not when temperatures were elevated. Stomatal conductance decreased when the CO2 concentration doubled, but there were few effects from elevated temperature. These findings

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