The chemical identity of intervessel pit membranes in Acer challenges hydrogel control of xylem hydraulic conductivity
The chemical identity of intervessel pit membranes in Acer challenges hydrogel control of xylem hydraulic conductivity
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DOI：
10.1093/aobpla/plw052
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发表时间：
2016-08
期刊：
影响因子：
2.9
通讯作者：
Matthias M Klepsch;M. Schmitt;J. Paul Knox;S. Jansen
中科院分区：
文献类型：
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作者：
Matthias M Klepsch;M. Schmitt;J. Paul Knox;S. Jansen
木质部汁液的离子浓度对水分的长距离运输有重要影响。基于免疫细胞化学，我们表明，果胶多糖和糖蛋白不与血管小凹膜。因此，我们挑战的假设，离子介导的增强水力传导是由周围的坑膜孔的果胶的膨胀或收缩。我们的研究结果加强了需要一个替代的假设，除了坑膜化学，以了解这种所谓的“离子效应”。
Long-distance water transport in wood is well known to be affected by the ionic concentration of xylem sap. Based on immunocytochemistry, we demonstrate that pectic polysaccharides and glycoproteins are not associated with vessel-vessel pit membranes. Therefore, we challenge the hypothesis that the ion-mediated enhancement of hydraulic conductance is caused by a swelling or shrinking of pectins surrounding pit membrane pores. Our findings reinforce the need for an alternative hypothesis besides the pit membrane chemistry to understand this so-called “ionic effect”.