Primary tissues may affect estimates of cavitation resistance in ferns
Primary tissues may affect estimates of cavitation resistance in ferns
复制标题
原发组织可能会影响蕨类植物抗空化能力的估计
DOI：
10.1111/nph.17374
复制
发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Sang, Ying
中科院分区：
文献类型：
--
作者：
Pittermann, Jarmila;Baer, Alex;Sang, Ying
测量蕨类植物叶柄中空化阻力的不同方法会导致不同的结果，特别是关于P50公制。我们假设蕨类中柱结构影响空气进入木质部，从而影响脆弱性曲线的形状。我们的研究通过比较田间常绿和落叶蕨类植物叶柄上构建的脆弱性曲线与标准离心机、注气和台面脱水方法生成的曲线来检验这种变化。额外的实验补充了脆弱性曲线，以更好地了解解剖学如何形成对汽蚀抗性的估计。离心法和径向注气法为落叶物种生成了可接受的脆弱性曲线，但高估了两种常绿蕨类的抗旱性。在这些耐寒植物中，轴向空气注入和台面脱水产生的结果与自然界的观察结果最接近。进一步的实验表明，分枝中柱的解剖结构阻碍了空气在纺纱和径向注气过程中进入木质部。每种方法都产生了可接受的易损性曲线，具体取决于被测试的物种。因此，我们强调验证场地内的曲线的重要性，包括测量水势，如果可能的话，还需要水力数据，以便用现有的任何方法产生实际结果。
Different methods of measuring cavitation resistance in fern petioles lead to variable results, particularly with respect to the P50metric. We hypothesised that the fern dictyostele structure affects air entry into the xylem, and therefore impacts the shape of the vulnerability curve.Our study examined this variation by comparing vulnerability curves constructed on petioles collected from evergreen and deciduous ferns in the field, with curves generated using the standard centrifuge, air‐injection and bench‐top dehydration methods. Additional experiments complemented the vulnerability curves to better understand how anatomy shapes estimates of cavitation resistance.Centrifugation and radial air injection generated acceptable vulnerability curves for the deciduous species, but overestimated drought resistance in the two evergreen ferns. In these hardy plants, axial air injection and bench‐top dehydration produced results that most closely aligned with observations in nature. Additional experiments revealed that the dictyostele anatomy impedes air entry into the xylem during spinning and radial air injection.Each method produced acceptable vulnerability curves, depending on the species being tested. Therefore, we stress the importance of validating the curves within situmeasures of water potential and, if possible, hydraulic data to generate realistic results with any of the methods currently available.