Physiological, morphological and anatomical responses of Fraxinus mandshurica seedlings to flooding.
Physiological, morphological and anatomical responses of Fraxinus mandshurica seedlings to flooding.
复制标题
水曲柳幼苗对洪水的生理、形态和解剖反应。
DOI：
10.1093/treephys/15.11.713
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发表时间：
1995
期刊：
影响因子：
4
通讯作者：
Kazuhiko Terazawa
中科院分区：
文献类型：
--
作者：
Fukuju Yamamoto;Tsutomu Sakata;Kazuhiko Terazawa
2年生水曲柳变种山茱萸将幼苗淹没至土壤水平以上8cm，持续70天。淹水处理改变了幼苗的生长、形态、茎的解剖结构和乙烯的产生。虽然洪水没有影响高度的增长，它刺激直径增长的淹没茎增加的数量和尺寸的木纤维生产，但是，木材纤维的细胞壁的厚度减少了洪水。在淹水处理中，幼苗形成了丰富的超水组织，起源于淹水茎表面的细胞附近，和不定根，通过超水组织生长。不定根的树皮中观察到通气组织。淹水处理虽然促进了不定根的形成，但对叶片和茎干重的增加量没有影响，但降低了根系总干重的增加量。淹水还提高了茎的浸没部分的乙烯产量。探讨了淹水诱导乙烯在淹水植物形成层生长和不定根形成中的作用。
Two-year-old Fraxinus mandshurica Rupr. var. japonica Maxim. seedlings were flooded to 8 cm above soil level for 70 days. The flooding treatment altered the growth, morphology, stem anatomy and ethylene production of the seedlings. Although flooding did not affect height growth, it stimulated diameter growth of the submerged stems by increasing both the number and size of wood fibers produced; however, the thickness of the cell walls of the wood fibers was reduced by flooding. In response to the flooding treatment, the seedlings formed abundant hyperhydric tissues, originating from the vicinity of lenticels on the surface of the flooded stems, and adventitious roots, which grew through the hyperhydric tissues. Aerenchyma tissues were observed in the bark of the adventitious roots. The flooding treatment did not affect dry weight increment of leaves and stems, but it reduced the total dry weight increment of the root system even though it promoted adventitious root formation. Flooding also enhanced ethylene production in the submerged portions of stems. The potential roles of flood-induced ethylene in cambial growth and adventitious root formation in flooded plants are discussed.