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Transpiration rate of White Clover (Trifolium repens L.) cultivars in drying soil

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posted on 2023-05-10, 07:36 authored by Lucy Egan, Rainer Hofmann, Shirley NicholsShirley Nichols, Johnathan Hadipurnomo, Valerio Hoyos-Villegas
Determining the performance of white clover cultivars under drought conditions is critical in dry climates. However, comparing the differences in cultivar performance requires equivalent soil water content for all plants, to reduce the water deficit threshold eliciting stomatal closure. In this study, the objective was to compare the rate of stomatal closure in eighty white clover cultivars in response to soil drying. Two glasshouse experiments were conducted, and the daily transpiration rate was measured by weighing each pot. The transpiration rate of the drought-stressed plants were normalized against the control plants to minimize effects from transpiration fluctuations and was recorded as the normalized transpiration rate (NTR). The daily soil water content was expressed as the fraction of transpirable soil water (FTSW). The FTSW threshold (FTSWc) was estimated after which the NTR decreases linearly. The FTSWc marks the critical point where the stomata start to close, and transpiration decreases linearly. The significant difference (p < 0.05) between the 10 cultivars with the highest and lowest FTSWc demonstrates the cultivars would perform better in short- or long-term droughts.


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Copyright © 2021 Egan, Hofmann, Nichols, Hadipurnomo and Hoyos-Villegas. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.


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Frontiers Media

Journal title

Frontiers in Plant Science




Egan, L., Hofmann, R., Nichols, S., Hadipurnomo, J., & Hoyos-Villegas, V. (2021). Transpiration rate of White Clover (Trifolium repens L.) cultivars in drying soil. Frontiers in Plant Science, 12, 595030. doi:10.3389/fpls.2021.595030