Tsuji Hiroyuki, Meguro Naoki, Suzuki Yasuhiro, Tsutsumi Nobuhiro, Hirai Atsushi, Nakazono Mikio
Laboratory of Plant Molecular Genetics, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 97403-1229, Japan.
FEBS Lett. 2003 Jul 10;546(2-3):369-73. doi: 10.1016/s0014-5793(03)00631-8.
Post-hypoxic injuries in plants are primarily caused by bursts of reactive oxygen species and acetaldehyde. In agreement with previous studies, we found accumulations of acetaldehyde in rice during re-aeration following submergence. During re-aeration, acetaldehyde-oxidizing aldehyde dehydrogenase (ALDH) activity increased, thereby causing the acetaldehyde content to decrease in rice. Interestingly, re-aerated rice plants showed an intense mitochondrial ALDH2a protein induction, even though ALDH2a mRNA was submergence induced and declined upon re-aeration. This suggests that rice ALDH2a mRNA is accumulated in order to quickly metabolize acetaldehyde that is produced upon re-aeration.
植物缺氧后损伤主要由活性氧爆发和乙醛引起。与先前的研究一致，我们发现淹水后复氧期间水稻中乙醛积累。在复氧过程中，乙醛氧化醛脱氢酶（ALDH）活性增加，从而导致水稻中乙醛含量降低。有趣的是，复氧的水稻植株显示出线粒体ALDH2a蛋白强烈诱导，尽管ALDH2a mRNA是淹水诱导的且在复氧时下降。这表明水稻ALDH2a mRNA积累是为了快速代谢复氧时产生的乙醛。
