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首页> 外文期刊>The New Phytologist >Enhancement of leaf photosynthetic capacity through increased stomatal density in Arabidopsis
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Enhancement of leaf photosynthetic capacity through increased stomatal density in Arabidopsis

机译：通过提高拟南芥气孔密度提高叶片光合能力

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摘要

Photosynthetic rate is determined by CO_2 fixation and CO_2 entry into the plant through pores in the leaf epidermis called stomata. However, the effect of increased stomatal density on photosynthetic rate remains unclear. This work investigated the effect of alteration of stomatal density on leaf photosynthetic capacity in Arabidopsis thaliana. Stomatal density was modulated by overexpressing or silencing STOMACEN, a positive regulator of stomatal development. Leaf photosynthetic capacity and plantgrowth were examined in transgenic plants. Increased stomatal density in STOA/IAGA/-overexpressing plants enhanced the photosynthetic rate by 30% compared to wild-type plants. Transgenic plants showed increased stomatal conductance under ambient CO_2 conditions and did not show alterations in the maximum rate of carboxylation, indicating that the enhancement of photosynthetic rate was caused by gas diffusion changes. A leaf photosynthesis-intercellular CO_2 concentration response curve showed that photosynthetic rate was increased under high CO_2 conditions in association with increased stomatal density. STOMACEN overexpression did not alter whole plant biomass, whereas its silencing caused biomass reduction. Our results indicate that increased stomatal density enhanced leaf photosynthetic capacity by modulating gas diffusion. Stomatal density may be a target trait for plant engineering to improve photosynthetic capacity.
机译：光合作用的速率由CO_2固定和CO_2通过叶片表皮气孔（称为气孔）进入植物决定。但是，气孔密度增加对光合速率的影响尚不清楚。这项工作调查了气孔密度的变化对拟南芥叶片光合作用能力的影响。气孔密度是通过过度表达或沉默气孔发育的正向调节剂STOMACEN来调节的。在转基因植物中检查了叶片的光合作用能力和植物生长。与野生型植物相比，STOA / IAGA /过表达植物中气孔密度的增加使光合速率提高了30％。转基因植物在环境CO_2条件下气孔导度增加，并且最大羧化率没有变化，表明光合速率的提高是由气体扩散变化引起的。叶片光合作用-细胞间CO_2浓度响应曲线表明，在高CO_2条件下，光合速率与气孔密度增加有关。 STOMACEN的过表达并没有改变整个植物的生物量，而其沉默导致生物量的减少。我们的结果表明，增加的气孔密度通过调节气体扩散增强了叶片的光合作用能力。气孔密度可能是植物工程提高光合作用能力的目标性状。

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