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<p>Blue light (BL) plays an important role in stomatal opening, finely tuning plant responses to environmental conditions. While the BL signaling pathway is well understood in C<sub>3</sub> and C<sub>4</sub> plants, its role in crassulacean acid metabolism (CAM) plants remains uncertain. Traditionally, stomata in CAM plants were considered insensitive to BL stimulation, and as a result, research&#xa0;on such interaction was overlooked for a long time. Only recently, studies have found that the BL signaling cascade is active in CAM plants. Here, we investigated the effects of BL irradiance on stomatal responses in <i>Agave</i>, a highly productive CAM plant, by stimulating <i>Agave</i> leaves with BL and taking measurements of leaf gas exchange during the morning (closed stomata) and in the afternoon (open stomata). Our findings revealed that BL had no significant effect on stomatal opening during the morning period. However, BL increased stomatal conductance (<i>g</i><sub><i>s</i></sub>) by 67.3%, photosynthetic rate (<i>A</i>) by 109.5%, and intrinsic water use efficiency (iWUE) by 69.5% in the late afternoon. These findings suggest that <i>Agave</i> responded to BL similarly to C<sub>3</sub> and C<sub>4</sub> species when stomata were already open. We hypothesized&#xa0;(for future studies) that high CO<sub>2</sub> concentrations due to C<sub>4</sub> acid decarboxylation during the morning act as a repressive factor for stomatal opening by inhibiting the phosphorylative activity of the HT1 protein, a key protein involved in stomatal response. This inhibition likely prevents the activation of the signaling pathway mediated by CBC1/2 kinase, which integrates BL signals with low intercellular CO<sub>2</sub> concentrations.</p>

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Blue light increases stomatal conductance and photosynthesis in an Agave hybrid

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Heitor Lopes Sartori,
  • Sávio Justino da Silva,
  • Larissa Prado da Cruz,
  • Matheus Dalló Laira,
  • Fábio Trigo Raya,
  • Gonçalo Amarante Guimarães Pereira,
  • Rafael Vasconcelos Ribeiro

摘要

Blue light (BL) plays an important role in stomatal opening, finely tuning plant responses to environmental conditions. While the BL signaling pathway is well understood in C3 and C4 plants, its role in crassulacean acid metabolism (CAM) plants remains uncertain. Traditionally, stomata in CAM plants were considered insensitive to BL stimulation, and as a result, research on such interaction was overlooked for a long time. Only recently, studies have found that the BL signaling cascade is active in CAM plants. Here, we investigated the effects of BL irradiance on stomatal responses in Agave, a highly productive CAM plant, by stimulating Agave leaves with BL and taking measurements of leaf gas exchange during the morning (closed stomata) and in the afternoon (open stomata). Our findings revealed that BL had no significant effect on stomatal opening during the morning period. However, BL increased stomatal conductance (gs) by 67.3%, photosynthetic rate (A) by 109.5%, and intrinsic water use efficiency (iWUE) by 69.5% in the late afternoon. These findings suggest that Agave responded to BL similarly to C3 and C4 species when stomata were already open. We hypothesized (for future studies) that high CO2 concentrations due to C4 acid decarboxylation during the morning act as a repressive factor for stomatal opening by inhibiting the phosphorylative activity of the HT1 protein, a key protein involved in stomatal response. This inhibition likely prevents the activation of the signaling pathway mediated by CBC1/2 kinase, which integrates BL signals with low intercellular CO2 concentrations.