ROOT RESPIRATION AND CARBOHYDRATE STATUS OF 2 WHEAT GENOTYPES IN RESPONSE TO HYPOXIA
ROOT RESPIRATION AND CARBOHYDRATE STATUS OF 2 WHEAT GENOTYPES IN RESPONSE TO HYPOXIA
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DOI：
10.1006/anbo.1995.1041
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发表时间：
1995-04-01
期刊：
影响因子：
4.2
通讯作者：
JOHNSON, JW
中科院分区：
文献类型：
--
作者：
HUANG, BR;JOHNSON, JW
为探讨根系呼吸和碳水化合物状况与耐涝耐缺氧的关系，测定了两种小麦(Triticum、Z nestivum L.)的根系呼吸速率及叶片和根系中的可溶性糖含量。耐低氧(5%O-2)和随后恢复充分曝气的耐涝类型不同。低氧对湿害敏感的焦化9835根系和地上部生长均有较大程度的抑制作用。根系呼吸或耗氧速率随低氧而下降，但在恢复曝气7d后恢复。在低氧后8d内，敏感的Coker 9835的呼吸频率大于耐受的Jackson。在低氧条件下，两个品种叶片中蔗糖、葡萄糖和果糖的浓度均降低。然而，在低氧条件下，根中这些糖的浓度增加了，对杰克逊来说增加的程度更大。在低氧条件下，杰克逊的根糖浓度与地上部糖浓度的比值增加，说明低氧条件下碳水化合物被大量分配到根中。结果表明，在低氧条件下，根系碳水化合物供应不是根系生长和呼吸的限制因素。在低氧条件下，植物对渍水或低氧的耐性可能与低根呼吸或耗氧速率和高糖积累有关。
To investigate root respiration and carbohydrate status in relation to waterlogging or hypoxia tolerance, root respiration rate and concentrations of soluble sugars in leaves and roots were determined for two wheat (Triticum?z nestivum L.) genotypes differing in waterlogging-tolerance under hypoxia (5% O-2) and subsequent resumption of full aeration. Root and shoot growth were reduced by hypoxia to a larger extent for waterlogging-sensitive Coker 9835. Root respiration or oxygen consumption rate declined with hypoxia, but recovered after 7 d of resumption of aeration. Respiration rate was greater for sensitive Coker 9835 than for tolerant Jackson within 8 d after hypoxia. The concentrations of sucrose, glucose and fructose decreased in leaves for both genotypes under hypoxia. The concentrations of these sugars in roots, however, increased under hypoxia, to a greater degree for Jackson. An increase in the ratio of root sugar concentration to shoot sugar concentration was found for Jackson under hypoxic conditions, suggesting that a large amount of carbohydrate was partitioned to roots under hypoxia. The results indicated that root carbohydrate supply was not a limiting factor for root growth and respiration under hypoxia. Plant tolerance to waterlogging or hypoxia appeared to be associated with low root respiration or oxygen consumption rate and high sugar accumulation under hypoxic conditions.