Leaf optical properties and photosynthesis of fern species with a wide range of divergence time in relation to mesophyll anatomy

  • Yuko T Hanba
    Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585 , Japan
  • Keisuke Nishida
    Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585 , Japan
  • Yuuri Tsutsui
    Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585 , Japan
  • Mayu Matsumoto
    Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585 , Japan
  • Yutarou Yasui
    Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585 , Japan
  • Yang Sizhe
    Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585 , Japan
  • Takumi Matsuura
    Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585 , Japan
  • Tomoko Kawaguchi Akitsu
    Earth Observation Research Center, Japan Aerospace Exploration Agency , 2-1-1 Sengen, Tsukuba 305-8505 , Japan
  • Atsushi Kume
    Faculty of Agriculture, Kyushu University , 744 Motooka, Nishi-ku, Fukuoka 819-0395 , Japan

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<jats:title>Abstract</jats:title><jats:sec><jats:title>Background and Aims</jats:title><jats:p>For a comprehensive understanding of the mechanisms of changing plant photosynthetic capacity during plant evolutionary history, knowledge of leaf gas exchange and optical properties are essential, both of which relate strongly to mesophyll anatomy. Although ferns are suitable for investigating the evolutionary history of photosynthetic capacity, comprehensive research of fern species has yet to be undertaken in this regard.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>We investigated leaf optical properties, gas exchange and mesophyll anatomy of fern species with a wide range of divergence time, using 66 ferns from natural habitats and eight glasshouse-grown ferns. We used a spectroradiometer and an integrating sphere to measure light absorptance and reflectance by the leaves.</jats:p></jats:sec><jats:sec><jats:title>Key Results</jats:title><jats:p>The more newly divergent fern species had a thicker mesophyll, a larger surface area of chloroplasts facing the intercellular airspaces (Sc), thicker cell walls and large light absorptance. Although no trend with divergence time was obtained in leaf photosynthetic capacity on a leaf-area basis, when the traits were expressed on a mesophyll-thickness basis, trends in leaf photosynthetic capacity became apparent. On a mesophyll-thickness basis, the more newly divergent species had a low maximum photosynthesis rate, accompanied by a low Sc.</jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p>We found a strong link between light capture, mesophyll anatomy and photosynthesis rate in fern species for the first time. The thick mesophyll of the more newly divergent ferns does not necessarily relate to the high photosynthetic capacity on a leaf-area basis. Rather, the thick mesophyll accompanied by thick cell walls allowed the ferns to adapt to a wider range of environments through increasing leaf toughness, which would contribute to the diversification of fern species.</jats:p></jats:sec>

収録刊行物

  • Annals of Botany

    Annals of Botany 131 (3), 437-450, 2023-02-07

    Oxford University Press (OUP)

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