Photosynthesis during Desiccation in an Intertidal Alga and a Land Plant

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概要

• 論文の詳細を見る

• This study was undertaken to determine how photosynthesis tolerates desiccation in an intertidal alga Fucus vesiculosus L.and a terrestrial sunflower Helianthus annuus L.Photosynthetic O_2 evolution generally was inhibited at low water potentials(Ψ_w)but more in sunflower leaves than in Fucus fronds at the same Ψ_w. As Ψ_w decreased, less carbon accumulated in an organic carbon store in Fucus. The inhibition of photosynthesis appeared to be mostly biochemical because it could not be prevented by supplying additional CO_2 or by supplying CO_2 from the internal organic carbon store. The inhibition of photosynthesis and carbon storage occurred after turgor disappeared and thus when solute concentrations were increasing in the cells. Solute concentrations were much higher in Fucus than in sunflower. After desiccation to the air-dry state(Ψ_w below -10MPa), photosynthesis could not recover in sunflower but it recovered rapidly when Fucus was exposed to seawater. The lack of recovery in sunflower was associated with inability to recover turgor probably because of breaks in cell membranes. The ability to recover in Fucus was gradually lost during 1.5 d of desiccation at 45% relative humidity. At lower humidities, recovery was lost sooner as small amounts of water were removed. We conclude that photosynthesis tolerated desiccation more in Fucus than in sunflower because of differences in the molecular environment around the photosynthetic enzymes. Important aspects of this environment were features that prevented membrane breakage but promoted the retention of small amounts of water that were critical for viability.

• 日本植物生理学会の論文

著者

• Kawamitsu Yoshinobu

  College of Agriculture, University of the Ryukyus

• Kawamitsu Yoshinobu

  College Of Marine Studies And College Of Agriculture And Natural Resources University Of Delaware

• Kawamitsu Yoshinobu

  College Of Agriculture University Of The Ryukyus

• Driscoll Timothy

  College of Marine Studies and College of Agriculture and Natural Resources, University of Delaware

• Boyer John

  College of Marine Studies and College of Agriculture and Natural Resources, University of Delaware

• Driscoll Timothy

  College Of Marine Studies And College Of Agriculture And Natural Resources University Of Delaware

• Boyer John

  College Of Marine Studies And College Of Agriculture And Natural Resources University Of Delaware

• Boyer John

  College Of Earth Ocean And Environment And College Of Agriculture And Natural Resources University Of Delaware

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