Wu Qiang, Feng Han-Qing, Li Hong-Yu, Wan Dong-Shi, Liang Hou-Guo
School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
Zhi Wu Sheng Li Yu Fen Zi Sheng Wu Xue Xue Bao. 2006 Apr;32(2):217-24.
The changes in cyanide-resistant respiration and metabolism of active oxygen species in drought-sensitive and drought-resistant wheat seedlings under water stress were studied. In general, drought stress decreased the level of cyanide-resistant respiration and AOX1 mRNA content in wheat seedling leaves. But the drought-resistant cultivars, which had much higher level of cyanide-resistant respiration and AOX1 mRNA content than the drought-sensitive ones, presented an ability to adapt to mild drought stress. Under drought stress, the drought-sensitive wheat seedling leaves had higher O(-.)(2) and H(2)O(2) contents, but lower SOD, POX and CAT activities than drought-resistant cultivars. We guessed that severe drought stress could break down the balance between active oxygen species and cyanide-resistant respiration. However, cyanide-resistant respiration still could participate in the drought-resistance by lowering the level of active oxygen species besides by other mechanism.
研究了水分胁迫下干旱敏感型和抗旱型小麦幼苗抗氰呼吸及活性氧代谢的变化。总体而言，干旱胁迫降低了小麦幼苗叶片的抗氰呼吸水平和AOX1 mRNA含量。但抗旱品种的抗氰呼吸水平和AOX1 mRNA含量比干旱敏感品种高得多，表现出适应轻度干旱胁迫的能力。干旱胁迫下，干旱敏感型小麦幼苗叶片的O(-.)(2)和H(2)O(2)含量较高，但超氧化物歧化酶（SOD）、过氧化物酶（POX）和过氧化氢酶（CAT）活性低于抗旱品种。我们推测，严重干旱胁迫可能打破活性氧与抗氰呼吸之间的平衡。然而，抗氰呼吸除了通过其他机制外，仍可通过降低活性氧水平参与抗旱。
