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首页> 外文期刊>Journal of Experimental Botany >Dynamics of adaptation of stomatal behaviour to moderate or high relative air humidity in Tradescantia virginiana
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Dynamics of adaptation of stomatal behaviour to moderate or high relative air humidity in Tradescantia virginiana

机译：香附子气孔行为适应中等或较高相对空气湿度的动力学

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Chlorophyll fluorescence imaging was used to measure stomatal closure in response to desiccation of Tradescantia virginiana leaves grown under high (90%) and moderate (55%) relative humidities (RHs), or transferred between these humidities. Stomata in leaves grown at high RH were less responsive to desiccation than those of leaves grown at moderate RH. Stomata of plants transferred from moderate RH conditions to high RH showed the same diminished closure in response to desiccation as did stomata that developed at high RH. This response was found both when the leaves were fully expanded and when still actively expanding during the moderate RH pre-treatment. Four days of exposure to high RH was the minimal exposure time to induce the diminished closure response. When leaves were grown in high RH prior to a 10 d moderate RH treatment, the reduced stomatal closure response to desiccation was only reversed in leaves (regions) which were actively expanding during moderate RH treatment. This indicates that with respect to stomatal responses to desiccation, high RH leaf regions have a limited capacity to adapt to moderate RH conditions. The decrease in responsiveness to desiccation of the stomata, induced by long-term exposure to high RH, was not due to osmotic adjustment in the leaves. Within 1 d after transferring moderate RH-grown plants to a high RH, the abscisic acid (ABA) concentration of their leaves decreased to the low level of ABA found in high RH-grown leaves. The closure response in leaves exposed to high RH for 5 d, however, could not be fully restored by the application of ABA. Transferring plants from high to moderate RH resulted in increased ABA levels within 2 d without a recovery of the stomatal closing response. It is discussed that the diminished stomatal closure in plants exposed to high RH could be due to changes in the signalling pathway for ABA-related closure of stomata or to an increased sequestration of ABA by mesophyll tissue or the symplast in the epidermis, induced by a longer period (several days) of a low ABA level.
机译：叶绿素荧光成像用于测量在较高（90％）和中等（55％）相对湿度（RHs）下生长或在这些湿度之间转移的紫露桐叶片干燥时的气孔关闭。与在中等湿度下生长的叶片相比，在高湿度下生长的叶片的气孔对干燥的反应较弱。从中等湿度条件转移到高湿度条件下的植物气孔显示出对干燥的响应与在高湿度条件下产生的气孔一样，减少了关闭。在中度RH预处理过程中，当叶片完全展开时和仍在积极展开时都发现了这种响应。暴露于高RH下四天是导致闭合反应减弱的最短暴露时间。当叶片在10 d中度RH处理之前在高RH中生长时，仅在中度RH处理期间活跃扩展的叶子（区域）中逆转了对干燥造成的降低的气孔闭合响应。这表明就气孔对干燥的响应而言，高RH叶片区域适应中度RH条件的能力有限。长期暴露于高RH引起的对气孔干燥的响应能力下降不是由于叶片中的渗透调节所致。在将中度RH生长的植物转移到高RH后1 d之内，其叶片的脱落酸（ABA）浓度降低到在高RH生长的叶片中发现的低ABA水平。然而，暴露于高湿度下5 d的叶片的闭合反应无法通过使用ABA完全恢复。将植物从较高的RH转移到中等的RH会导致在2天内ABA水平升高，而气孔关闭反应没有恢复。讨论了暴露于高RH的植物中气孔关闭的减少可能是由于ABA诱导的气孔ABA相关的气孔关闭的信号传导途径改变或由于叶肉组织或表皮共生体对ABA的隔离增加所致。 ABA水平较低的时间较长（几天）。

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    《Journal of Experimental Botany》 |2008年第2期|p.289-301|共13页
  • 作者

    Abdolhossein Rezaei Nejad12 and Uulke van Meeteren1*;

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    1Horticultural Production Chains Group, Plant Sciences, Wageningen University, Marijkeweg 22, 6709 PG, Wageningen, The Netherlands 2Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University, PO Box 465, Korramabad, Iran;

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