Nadeau P, Delaney S, Chouinard L
Agriculture Canada, 2560, boul. Hochelaga, Sainte-Foy (Québec) Canada G1V 2J3.
Plant Physiol. 1987 May;84(1):73-7. doi: 10.1104/pp.84.1.73.
When leaves of wheat (Triticum aestivum L.) are exposed to a cold hardening temperature, a major accumulation of putrescine (6-9 times) takes place. Spermidine accumulates to a lesser extent and, conversely, spermine decreases slightly. These variations are completely reversible when plants are returned to initial growing conditions. A similar response is obtained with crowns. During cold hardening, arginine decarboxylase activity remains near its initial level while a considerable loss of activity is observed in control plants. Ornithine decarboxylase and diamine oxidase activity levels are not substantially modified by the treatment. Alfalfa (Medicago sativa L.) also accumulates putrescine under low temperature stress, indicating that this phenomenon is not typical of cereals. The physiological significance of this accumulation of putrescine is still unexplained but the results obtained suggest the involvement of polyamines in the biochemical processes of cold hardening.
当小麦（Triticum aestivum L.）叶片暴露于低温驯化温度时，腐胺会大量积累（6 - 9倍）。亚精胺积累程度较小，相反，精胺略有减少。当植株恢复到初始生长条件时，这些变化是完全可逆的。冠部也有类似反应。在低温驯化过程中，精氨酸脱羧酶活性保持在初始水平附近，而对照植株中则观察到活性显著丧失。鸟氨酸脱羧酶和二胺氧化酶活性水平未因处理而发生实质性改变。苜蓿（Medicago sativa L.）在低温胁迫下也会积累腐胺，表明这种现象并非谷类作物所特有。腐胺积累的生理意义尚不清楚，但所获得的结果表明多胺参与了低温驯化的生化过程。
