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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Photosynthesis and Photobiology
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1397948
This article is part of the Research Topic Enhancement of Photosynthesis through Light Utilization in Plants and Crops View all 5 articles

Response of stomatal conductance, transpiration and photosynthesis to light and CO 2 for rice leaves with different appearance days

Provisionally accepted
  • 1 Yangzhou University, Yangzhou, China
  • 2 College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu Province, China
  • 3 College of Agricultural Sciences and Engineering, Hohai University, Nanjing, Liaoning Province, China

The final, formatted version of the article will be published soon.

    To investigate the dynamics of stomata, transpiration, and photosynthesis under varying light intensities and CO 2 conditions during leaf development, the light response and CO 2 response of stomatal conductance (g sw ), transpiration rate (T r ) and net photosynthetic rate (P n ) were conducted for rice leaves at different days after leaf emergence (DAE). The results showed that 1) As photosynthetically active radiation (PAR) increased, leaf g sw , T r and P n initially increased rapidly and linearly, followed by a more gradual rise to the maximum values, and then either stabilized or showed a declining trend. The maximum g sw , T r , and P n were smaller and occured earlier for old leaves than that for young leaves. The g sw , T r , and P n all exhibited a linear decreasing trend with increasing DAE, and the rate of decrease slowed down with the reduction in PAR. 2) As CO 2 concentration (C a ) increased, the g sw and T r decreased gradually to the stable minimum value, while the P n increased linearly and slowly up to the maximum, then kept stable or decreased. The g sw , T r and P n initially kept high and then decreased with the increase of DAE. These results contributed to understanding the dynamics in g sw , T r and P n during rice leaf growth and their responds to varied light and CO 2 concentration conditions, and provide mechanistic support for estimating dynamic evapotranspiration and net ecosystem productivity at field-scale and larger-scale in paddy field ecosystems through the upscaling of leaf-level stomatal conductance, transpiration and photosynthesis.

    Keywords: photosynthetic rate, Transpiration rate, Stomatal conductance, light response, CO 2

    Received: 08 Mar 2024; Accepted: 08 Jul 2024.

    Copyright: © 2024 Lv, Linhui, Man, Liu and Xu. 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) or licensor 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.

    * Correspondence: Yuping Lv, Yangzhou University, Yangzhou, China

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