Aluminum could be transported via phloem in Camellia oleifera Abel.
Aluminum could be transported via phloem in Camellia oleifera Abel.
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DOI：
10.1093/treephys/tps117
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发表时间：
2013
期刊：
影响因子：
4
通讯作者：
Q. Zeng;R. Chen;X. Zhao;R. Shen;A. Noguchi;F. Shinmachi;I. Hasegawa
中科院分区：
文献类型：
--
作者：
Q. Zeng;R. Chen;X. Zhao;R. Shen;A. Noguchi;F. Shinmachi;I. Hasegawa
研究了油茶（Camellia oleifera Abel.）中铝（Al）的积累和长距离运输，油茶是已知的铝积累剂。油茶种子胚中铝含量平均为干重389 mg Al·kg(-1)，高于其他铝积累体种子。通过部分抑制田间叶片蒸腾作用，叶片中铝积累受到抑制，这阐明了木质部运输对叶片铝积累的重要性。然而，仅木质部运输的影响并不能充分解释叶片蒸腾作用弱的季节铝的高积累，这暗示了韧皮部运输发挥作用的必要性。树皮韧皮部分泌物中的铝含量提供了韧皮部运输的另一个证据。扫描电子显微镜图像和能量色散分析还表明，油茶叶柄的韧皮部中存在铝。油茶中的铝也可以重新分配：当将铝提供给同一植物的不同叶子时，叶子中的铝浓度会更高。此外，处理前将原根全部切除的油茶苗新生根中也存在Al，且新生根中Al含量与叶片中Al含量呈正相关。使用空种皮技术的结果表明，在种子发育过程中发生了通过韧皮部的铝卸载。总之，结果表明，铝可以在叶片之间重新分配，从种子到叶片，叶片到根，叶片到种子，这表明铝可以通过油茶中的韧皮部运输。
Aluminum (Al) accumulation and long-distance transport in oil tea (Camellia oleifera Abel.), known to be an Al accumulator, was investigated. The average Al concentration in the embryo of oil tea seeds was 389 mg Al kg(-1) dry weight, which was higher than seeds of other Al accumulators. By partially suppressing leaf transpiration in the field, Al accumulation in leaves was depressed, which clarified the importance of xylem transport to Al accumulation in leaves. However, the effects of xylem transport alone could not sufficiently explain the high Al accumulation in the seasons when the leaf transpiration is weak, which hints the necessity of phloem transport working. Aluminum content in phloem exudates of barks provides another evidence of phloem transport. Images from scanning electron microscopy and energy-dispersive analysis also showed that Al was present in the phloem of oil tea petioles. Aluminum in oil tea could also be redistributed: higher concentrations of Al were found in leaves when Al was supplied to a different leaf of the same plant. In addition, Al was present in newly emerging roots of oil tea seedlings in which all original roots were excised prior to treatment, and a positive correlation existed between Al content in the newly formed roots and that in the leaves. The results using the empty seed coat technique showed that Al unloading via the phloem occurred during seed development. In conclusion, the results demonstrated that Al could be redistributed between leaves, from seeds to leaves, leaves to roots and leaves to seeds, which indicates that Al can be transported via the phloem in oil tea.