Growth and development ofRumex roots as affected by hypoxic and anoxic conditions
Growth and development ofRumex roots as affected by hypoxic and anoxic conditions
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DOI：
10.1007/bf02150045
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发表时间：
1991-10
期刊：
影响因子：
4.9
通讯作者：
P. Laan;J. Clement;C. Blom
中科院分区：
文献类型：
--
作者：
P. Laan;J. Clement;C. Blom
在水培条件下，研究了不同溶氧浓度下三种瘤胃菌的生长特性。这些物种都发生在河流滨岸生态系统，他们被发现在他们的洪水耐受性不同。耐洪性R.马里蒂米松河在低溶解氧浓度下，香根草在短时间内产生大量新的通气组织根。生物质生产没有受到影响。在洪水不容忍R。然而，在低于2%（v：v）的溶液氧浓度下，只有少数生长缓慢的新根发育，生物量生产显著降低。这些不同的反应可以部分地解释了一个差异通气组织形成新的根的耐洪水的物种。通气组织可通过内部通气缓解根系的氧胁迫，耐涝品种新根的快速发育。马里蒂穆桑德河crispus发生后的厌氧正好减少或停止生长的主根。尽管停止增长，但是，这两个物种的主根能够恢复后恢复有氧条件下经过13天的厌氧期。然而，R.在缺氧开始后不久，球花牛鞭草就停止生长。所有人都死在10 day.The之间的平衡的增长率的主要和新形成的根系进行了讨论和相关的差异耐受性的rumex物种短暂的洪水。
The growth characteristics of threeRumexspecies were determined under different solution oxygen concentrations in hydroculture. These species all occur in a river foreland ecosystem and they were found to differ in their flood tolerance. The flood-tolerantR. maritimusundR. crispusdeveloped a large number of new, aerenchymatous roots within a short period under low solution oxygen concentrations. Biomass production was not affected. In the flood-intolerantR. thyrsiflorus, however, only few slow-growing new roots were developed and biomass production was significantly reduced at solution oxygen concentrations below 2% (v:v). These different responses could be partly explained by a differential aerenchyma formation in new roots of the flood-tolerant species. Aerenchyma can relieve the oxygen stress of the root systems via internal aeration.The fast development of new roots of the flood-tolerantR. maritimusandR. crispusafter the onset of anaerobiosis coincided with the reduction or cessation of growth of the primary roots. Notwithstanding the cessation of growth, however, primary roots of both species were able to recover following restoration of aerobic conditions after a 13-day anaerobic period. However, the roots ofR. thyrsiflorusceased growing very soon after the onset of anaerobiosis. All had died within 10 days.The balance between the growth rates of the primary and the newly formed root system are discussed and related to the differential tolerance of theRumexspecies to transient flooding.