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首页> 外文期刊>Russian Journal of Plant Physiology >Effect of cadmium on growth and respiration of barley plants grown under two temperature regimes.
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Effect of cadmium on growth and respiration of barley plants grown under two temperature regimes.

机译：镉对在两种温度下生长的大麦植物生长和呼吸的影响。

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摘要

We studied cadmium effect on the respiratory pathways ratio in the organs of barley (Hordeum distichum L., cv. Novichok) plants grown in water culture at two temperature regimes. Mineral nutrients were supplied daily in exponentially increasing amounts in order to provide for steady-state growth. CdSO4 (30, 60, or 100 micro mol/l) was added to nutrient solution at a single time in the beginning of the exponential growth period (19 days after germination). In further 6 days, the relative growth rate and biomass accumulation declined stronger with the increase in the cadmium concentration in plants grown at 13/8 degrees C (dayight) than at 21/17 degrees C (dayight). Cadmium suppressed root respiration (down to 60% of control) stronger than leaf respiration, and the roots manifested a higher sensitivity to the inhibitor of alternative oxidase, salicylhydroxamic acid. The respiratory pathways ratio in the roots occurred against the background of activated lipid peroxidation (POL). The highest POL activity and the highest proportion of alternative respiration pathway (AP) (up to 46% of total respiration) were observed in the roots in the presence of the highest cadmium concentration (100 micro M) under lower temperature (13/8 degrees C). Thus, high cadmium concentrations affected strongly the total rate of respiration and respiratory pathways ratio. Growth temperature modulated Cd effects on respiration. AP activation is one of the mechanisms for maintenance of root cell homeostasis under cadmium-induced stress.
机译：我们研究了镉对两种温度下水培养大麦（Hordeum distichum L.，cv。Novichok）植物器官中呼吸途径比率的影响。矿物质养分每天以指数增加的方式提供，以提供稳态生长。在指数生长期（发芽后19天）开始时，一次将CdSO 4 （30、60或100微摩尔/升）添加到营养液中。在接下来的6天中，相对于21/17摄氏度（昼/夜），在13/8摄氏度（昼/夜）生长的植物中，相对生长速率和生物量积累随着镉浓度的增加而下降得更厉害。镉比叶呼吸更能抑制根呼吸（低至对照的60％），并且根对替代氧化酶抑制剂水杨基羟肟酸的敏感性更高。根部的呼吸途径比率是在活化脂质过氧化（POL）的背景下发生的。在较低温度（13/8度）下存在最高镉浓度（100 micro M）的根中，观察到最高的POL活性和最高的替代呼吸途径（AP）比例（最多占总呼吸的46％）。 C）。因此，高镉浓度强烈影响总呼吸速率和呼吸途径比率。生长温度调节的镉对呼吸的影响。 AP激活是在镉诱导的胁迫下维持根细胞稳态的机制之一。

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