Albrecht G, Kammerer S, Praznik W, Wiedenroth E M
Institute of General Botany, Humboldt-University, Philippstr. 13, 0-1040 Berlin, FRG.
Institute of Chemistry, University for Bodenkultur, Gregor-Mendelstr. 33, A-1180 Vienna, Austria.
New Phytol. 1993 Mar;123(3):471-476. doi: 10.1111/j.1469-8137.1993.tb03758.x.
We studied fructan accumulation in wheat seedlings (Triticum aestivum L. cv. Alcedo) caused by oxygen shortage around the root. Plants were cultivated in either nitrogen-flushed or aerated nutrient solution. In response to the nitrogen treatment there was an accumulation of soluble carbohydrates in shoots as well as in roots. The main contribution was due to fructans. The content of fructo-oligosaccharides had been increased five-fold in the roots and seven-fold in the shoots. This is incompatible with the assumption that higher substrate consumption follows enhanced fermentation under oxygen shortage. Re-aeration of the nitrogen-flushed nutrient solution resulted in enhanced consumption of stored carbohydrates, mainly of fructans, accompanied by high growth rates of the roots. The possibility of utilizing fructans quickly if oxygen is available is a possible advantage for plants adapted to hypoxia. Particularly however, it is suggested that the low energy requirements for sucrose: sucrose fructosyl transferase, allowing fructan synthesis even under oxygen shortage, may improve the fitness of plants to survive temporary hypoxia in the rhizosphere.
我们研究了根部周围缺氧导致的小麦幼苗（普通小麦品种Alcedo）中果聚糖的积累情况。将植株种植在氮气冲洗或通气的营养液中。作为对氮气处理的响应，地上部分和根部均积累了可溶性碳水化合物。主要贡献来自果聚糖。根中低聚果糖含量增加了五倍，地上部分增加了七倍。这与缺氧情况下发酵增强会导致底物消耗增加的假设不一致。对氮气冲洗的营养液进行再通气，会导致储存的碳水化合物（主要是果聚糖）消耗增加，同时根部生长速率加快。如果有氧气，能够快速利用果聚糖的可能性对于适应低氧环境的植物来说可能是一个优势。然而，特别需要指出的是，蔗糖：蔗糖果糖基转移酶的低能量需求使得即使在缺氧情况下也能合成果聚糖，这可能会提高植物在根际暂时缺氧环境下的生存适应性。
