Root anatomical traits determined leaf-level physiology and responses to precipitation change of herbaceous species in a temperate steppe
Root anatomical traits determined leaf-level physiology and responses to precipitation change of herbaceous species in a temperate steppe
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根部解剖特征决定温带草原草本植物叶级生理和对降水变化的响应
DOI：
10.1111/nph.16797
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发表时间：
2020-08-10
期刊：
影响因子：
9.4
通讯作者：
Zhang, Wen-Hao
中科院分区：
文献类型：
--
作者：
Zhou, Meng;Bai, Wenming;Zhang, Wen-Hao
根系解剖在控制叶片水分关系中起着重要作用。然而，很少有研究评估吸收根的解剖特征是否以及如何影响温带草原草本物种的叶片生理。通过田间刺激试验，测定了温带草原15种草本植物的吸收根解剖性状和叶片生理性状，并监测了它们对降水增加的响应。单子叶草、单子叶百合花和双子叶草本植物的根系解剖和叶片生理性状存在差异。柱根直径大、根直径小、茎皮质厚度小的树种蒸腾速率和气孔导度较高，但内在水分利用效率较低。增加降水增加了草本植物和百合花的蒸腾和气孔导度，但只增加了百合花的光合作用。百合花对降水的敏感反应可能与其根径和皮厚较大有关。综上所述，我们观察到温带草原不同植物类群间吸收根的解剖特征存在明显差异。这些差异驱动了叶片生理性状的变化及其对降水变化的不同响应。这些发现强调了温带草原根系解剖性状在驱动叶片生理过程中的重要作用。
Root anatomy plays important roles in the control of leaf water relations. However, few studies have evaluated whether and how anatomical traits of absorptive roots influence leaf physiology of herbaceous species in a temperate grassland. We measured absorptive root anatomical traits and leaf physiological traits of 15 herbaceous species in a temperate steppe and monitored their responses to increased precipitation in a field stimulating experiment. Root anatomical and leaf physiological traits differed among monocotyledonous grasses, monocotyledonous liliaceous species and dicotyledonous forbs. The species with higher stele: root diameter, lower root diameter and cortex thickness exhibited higher transpiration rates and stomatal conductance, but lower intrinsic water-use efficiency. Increased precipitation enhanced transpiration and stomatal conductance of forbs and lilies, but it enhanced photosynthesis in lilies exclusively. The sensitive response of lilies to precipitation may be related to their large root diameter and cortex thickness. In summary, we observed distinct differences in anatomical traits of absorptive roots among plant groups in temperate steppes. These differences drove variations in leaf physiological traits and their diverse responses to precipitation change. These findings highlight the important roles of root anatomical traits in driving leaf-level physiological processes in temperate grasslands.