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Abstract <p>Plant water transport and regulation are essential for maintaining water balance and normal physiological activities, while electrophysiological information enables in-depth understanding of intracellular water metabolism and its role in plant water homeostasis. However, diel differences in intracellular water dynamics among plants of distinct photosynthetic types remain unclear. In this study, <i>Echeveria desmetiana</i> (a crassulacean acid metabolism (CAM) plant) and <i>Solanum lycopersicum</i> L. (C<sub>3</sub> plant) plants were selected as experimental materials. Leaf electrophysiological parameters and leaf water potential (Ψ<sub>L</sub>) of both species, stomatal morphological parameters of <i>E. desmetiana</i>, and gas exchange parameters of <i>S. lycopersicum</i> were measured at daytime (9:00) and nighttime (21:00). This study explored the diel relationship between leaf stomatal aperture and intracellular water dynamics in the two species. Results showed that <i>E. desmetiana</i> exhibited CAM physiology, with nocturnal carbon and water storage, and daytime photosynthesis and water conservation. Correspondingly, its intracellular water dynamics featured high nocturnal activity and relative daytime stability. In contrast, <i>S. lycopersicum</i> adapted to C<sub>3</sub>-plant traits of active daytime photosynthesis and reduced nocturnal metabolism, showing diurnally active and nocturnally stable intracellular water dynamics. Compared with C<sub>3</sub> plants, CAM carbon metabolism exhibits distinct temporal separation and concentration characteristics and higher efficiency, thus requiring a matched intracellular water storage and transport system. This study reveals diel differences in intracellular water dynamics between the two photosynthetic types and further clarifies the role of intracellular water in plant water balance.</p>

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Variations of Stomatal Aperture/Conductance and Leaf Intracellular Water Dynamics in Echeveria desmetiana and Solanum lycopersicum L. between Day and Night

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • H. Chen,
  • D. Xing,
  • Y. Wu,
  • J. Li,
  • M. R. Quispe Puma

摘要

Abstract

Plant water transport and regulation are essential for maintaining water balance and normal physiological activities, while electrophysiological information enables in-depth understanding of intracellular water metabolism and its role in plant water homeostasis. However, diel differences in intracellular water dynamics among plants of distinct photosynthetic types remain unclear. In this study, Echeveria desmetiana (a crassulacean acid metabolism (CAM) plant) and Solanum lycopersicum L. (C3 plant) plants were selected as experimental materials. Leaf electrophysiological parameters and leaf water potential (ΨL) of both species, stomatal morphological parameters of E. desmetiana, and gas exchange parameters of S. lycopersicum were measured at daytime (9:00) and nighttime (21:00). This study explored the diel relationship between leaf stomatal aperture and intracellular water dynamics in the two species. Results showed that E. desmetiana exhibited CAM physiology, with nocturnal carbon and water storage, and daytime photosynthesis and water conservation. Correspondingly, its intracellular water dynamics featured high nocturnal activity and relative daytime stability. In contrast, S. lycopersicum adapted to C3-plant traits of active daytime photosynthesis and reduced nocturnal metabolism, showing diurnally active and nocturnally stable intracellular water dynamics. Compared with C3 plants, CAM carbon metabolism exhibits distinct temporal separation and concentration characteristics and higher efficiency, thus requiring a matched intracellular water storage and transport system. This study reveals diel differences in intracellular water dynamics between the two photosynthetic types and further clarifies the role of intracellular water in plant water balance.