Woody species grown under sun and shade present similar stomatal speed
Woody species grown under sun and shade present similar stomatal speed
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DOI：
10.1007/s40626-023-00283-3
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发表时间：
2023-07-24
影响因子：
2.6
通讯作者：
Cardoso，Amanda A.
中科院分区：
文献类型：
--
作者：
Freitas，Rafael S.;Oliveira，Leonardo A.;Cardoso，Amanda A.
气孔是表皮上的小孔，负责严格控制扩散到叶子中的CO2量，同时控制损失到大气中的水蒸气量。气孔阀打开和关闭所需的时间与优化的液压供应相协调，并强烈响应周围环境。我们表明，强烈的阴影条件下促进高水平的可塑性，在木本树种的Podocarpus macrophyllus，尾叶桉，和辣椒，在一系列的水力，解剖，和气体交换特性参数，已与优化气孔动力学。然而，在这些物种中表达的高水平的可塑性，并没有转化为改变的时间达到90%的最大气孔导度（GS）的变化（t90）时，植物暴露于动态变化的辐照度。在某些情况下，生长光影响的最大斜率的gs。然而，这种方法被证明是不理想的评估气孔速度在阳光和阴影驯化植物，因为这种方法在很大程度上依赖于最大。我们的研究结果表明，气孔速度，所示的t90，具有较低的表型可塑性，是最有可能下一个较强的遗传调控比其他叶片和气孔解剖性状。
Stomata are small epidermal pores responsible for the strict control of the amount of CO2that diffuses into the leaves while controlling the amount of water vapor lost to the atmosphere. The time required for the stomatal valve opening and closing is coordinated with an optimized hydraulic supply and strongly responds to the surrounding environment. We demonstrate that intense shading conditions promote high levels of plasticity in the woody species ofPodocarpus macrophyllus,Eucalyptus urophylla, andCapsicum chinense, in a series of hydraulic, anatomical, and gas exchange traits—parameters that have been associated with optimized stomatal kinetics. The high levels of plasticity expressed in these species, however, did not translate into alterations in the time to reach 90% of the maximum stomatal conductance (gs) changes (t90) when plants were exposed to dynamic changes in irradiance. In some cases, the growth light affected the maximum slope ofgs. This approach, however, was demonstrated not to be ideal for assessing stomatal speed in sun- and shade-acclimated plants as this method was largely dependent on maximumgs. Our findings suggest that stomatal speed, as demonstrated by t90, has low phenotypic plasticity and is most likely under a stronger genetic regulation than other leaf and stomatal anatomical traits.