RESPIRATION OF CROP SPECIES UNDER CO-2 ENRICHMENT
RESPIRATION OF CROP SPECIES UNDER CO-2 ENRICHMENT
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DOI：
10.1111/j.1399-3054.1985.tb02309.x
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发表时间：
1985-01-01
影响因子：
6.4
通讯作者：
MORISON, JIL
中科院分区：
文献类型：
--
作者：
GIFFORD, RM;LAMBERS, H;MORISON, JIL
小麦（Triticum aestivum L.）“Gabo”和“WW 15”）、绿豆（Vigna radiata L.）Wilczek“Celera”）和向日葵（Helianthus annuus L.“Sunfola”）在正常CO2浓度下和在含有额外340（或250）μ l l-1CO 2的空气中生长的植物中进行研究。据预测，全球大气CO2浓度的这种增加大约将在下个世纪中期出现。目的是测量高CO2对呼吸及其组成部分的影响。 极谱和小麦，CO2交换技术。在0.1 mM KCN存在下，用极谱法测定根呼吸替代途径的能力。替代途径呼吸的实际速率通过由10 mM水杨基异羟肟酸引起的O2消耗的减少来评估。每个物种的反应都不一样。在小麦中，高大气CO2的生长与根系和整株植物的呼吸作用减少5%有关。 使用呼吸抑制剂的极谱测量小麦根牵连的替代途径的参与程度的减少，作为一个主要的贡献者，这减少了高CO2植物的呼吸活性。小麦根干重在高CO2浓度下变化不大。在没有一个物种是有增加的绝对，或相对的，由替代途径的根系总呼吸的贡献。因此，改善光合同化物供应的植物生长在高CO2并没有导致增加转向C通过非磷酸化替代途径的呼吸在根中。在高CO2条件下生长的小麦中，通过这一途径减少的C损失一定有助于其更大的干重。
Respiratory characteristics of wheat (Triticum aestivum L. ''Gabo'' and''WW15''), mung bean (Vigna radiata L. Wilczek ''Celera'') and sunflower (Helianthus annuus L. ''Sunfola'') were studied in plants grown under a normal CO2 concentrations and in air containing an additional 340 (or 250) .mu.l l-1 Co2. Such an increase in global atmospheric CO2 concentration is forecast for about the middle of the next century. The aim was to measure the effect of high CO2 on respiration and its components. Polarographic and, with wheat, CO2 exchange techniques were used. The capacity of the alternative pathway of respiration in roots was determined polarographically in the presence of 0.1 mM KCN. The actual rate of alternative pathway respiration was assessed by reduction in O2 consumption caused by 10 mM salicylhydroxamic acid. Each species responded differently. In wheat, growth in high atmospheric CO2 was associated with up to 5% reduction in respiration by both roots and whole plants. Use of respiratory inhibitors of polarographic measurements on wheat roots implicated reduction in the degree of engagement of the alternative pathway as a major contributor to this reduced respiratory activity of high-CO2 plants. No change was found in the total sugar content per until wheat root dry weight was a result of high CO2. In none of the species was there an increase in the absolute, or relative, contribution by the alternative pathway to total respiration of the root systems. Thus the improved photosynthetic assimilate supply of plants grown in high CO2 did not lead to increased diversion of C through the non-phosphorylating alternative pathway of respiration in the root. In wheat grown in high CO2 the reduced loss of C through that route must have contributed to their larger dry weight.