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Dynamics of radial oxygen loss in mangroves subjected to waterlogging.
Ecotoxicology ( IF 2.7 ) Pub Date : 2020-05-12 , DOI: 10.1007/s10646-020-02221-4
Hao Cheng 1, 2 , Mei-Lin Wu 1, 2 , Chang-Da Li 3 , Fu-Lin Sun 1, 2, 4 , Cui-Ci Sun 1, 2, 4 , You-Shao Wang 1, 2, 4
Affiliation  

Tidal flooding can directly result in oxygen (O2) shortage, however the functions of root aeration in flooding tolerance and O2 dynamics within mangroves are still poorly understood. Thus, in this study, the correlations among waterlogging tolerance, root porosity and O2 movement within the plants were investigated using two mangrove species (Aegiceras corniculatum and Bruguiera gymnorrhiza) and a semi-mangrove Heritiera littoralis. Based on the present data, the species A. corniculatum and B. gymnorrhiza, which possessed higher root porosity, exhibited higher waterlogging tolerance, while H. littoralis is intolerant. Increased root porosity, leaf stoma, and total ROL were observed in the roots of A. corniculatum and B. gymnorrhiza growing in stagnant solution when compared to respective aerated controls. As for ROL spatial pattern along roots, external anaerobic condition could promote ROL from apical root regions but reduce ROL from basal roots, leading to a 'tighter barrier'. In summary, the present study indicated that the plants (e.g., A. corniculatum and B. gymnorrhiza) prioritized to ensure O2 diffusion towards root tips under waterlogging by increasing aerenchyma formation and reducing O2 leakage at basal root regions.

中文翻译:

遭受涝渍的红树林径向氧损失的动力学。

潮汐泛滥可直接导致氧气(O2)短缺,但是对于红树林中根系通气在抗洪能力和O2动态方面的功能仍然知之甚少。因此,在这项研究中,使用两种红树林物种(Aegiceras corniculatum和Bruguiera Gymnorrhiza)和半红树林Heritiera littoralis研究了植物体内的耐涝性,根系孔隙率和O2移动之间的相关性。根据目前的数据,具有较高的根部孔隙度的A.corniculatum和B.gymnorrhiza物种表现出较高的涝渍耐受性,而H. littoralis则不耐。与相应的充气对照组相比,在停滞溶液中生长的A. corniculatum和B. camnorrhiza的根中观察到了根部孔隙率,叶片气孔和总ROL增加。至于沿根的ROL空间格局,外部厌氧条件可促进根尖区域的ROL,但可降低基部根部的ROL,从而导致“更紧密的屏障”。总而言之,本研究表明植物(例如,A。corniculatum和B. Gymnorrhiza)通过增加气孔形成并减少基础根区域的O2泄漏,确保了O2在涝渍下向根尖的扩散。
更新日期:2020-05-12
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