Differential response of leaf gas exchange to enhanced ultraviolet-B (UV-B) radiation in three species of herbaceous climbingplants |
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Authors: | Yun Liu Zhang-Cheng Zhong |
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Affiliation: | aCollege of Resources and Environment, Key Laboratory of the Eco-Environment of the Three Gorges Reservoir Region of the Ministry of Education, Southwest University, Chongqing 400716, China;bFaculty of Life Sciences, Key Laboratory of the Eco-Environment of the Three Gorges Reservoir Region of the Ministry of Education, Southwest University, Chongqing 400715, China |
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Abstract: | We measured diurnal changes in photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency in three species of herbaceous climbing plants (Luffa cylindrica, Trichosanthes kirilowii and Dioscorea opposita) exposed to two intensities of UV-B radiation: 3.0 μw cm−2 (R1) and 8.0 μw cm−2 UV-B (R2) radiation under ambient growth conditions. Responses differed per species and per treatment. In Luffa all values increased compared to the Control in both treatments, except for stomatal conductance in R2. In Trichosanthes photosynthetic rates and water use efficiency increased, while the transpiration rates decreased under both treatments, and stomatal conductance was lower in R1. In Dioscorea photosynthetic rates and water use efficiency decreased under both treatments, while the transpiration rates and stomatal conductance increased. The results suggested that to some extent increased UV-B radiation was beneficial to the growth of L. cylindrica and T. kirilowii, but detrimental to D. opposita. |
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Keywords: | UV-B radiation Luffa cylindrica Trichosanthes kirilowii Dioscorea opposita Photosynthetic rate Transpiration rate Stomatal conductance Water use efficiency |
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