McCabe TC, Finnegan PM, Day DA, Whelan J
Department of Biochemistry, The University of Western Australia, Nedlands, Perth, WA 6907, Australia (T.C.M., J.W.).
Plant Physiol. 1998 Oct;118(2):675-82. doi: 10.1104/pp.118.2.675.
The expression of the alternative oxidase (AOX) was investigated during cotyledon development in soybean (Glycine max [L.] Merr.) seedlings. The total amount of AOX protein increased throughout development, not just in earlier stages as previously thought, and was correlated with the increase in capacity of the alternative pathway. Each AOX isoform (AOX1, AOX2, and AOX3) showed a different developmental trend in mRNA abundance, such that the increase in AOX protein and capacity appears to involve a shift in gene expression from AOX2 to AOX3. As the cotyledons aged, the size of the mitochondrial ubiquinone pool decreased. We discuss how this and other factors may affect the alternative pathway activity that results from the developmental regulation of AOX expression.
在大豆（Glycine max [L.] Merr.）幼苗子叶发育过程中，对交替氧化酶（AOX）的表达进行了研究。AOX蛋白的总量在整个发育过程中都有所增加，并非如之前所认为的仅在早期阶段增加，并且与交替途径能力的增加相关。每种AOX同工型（AOX1、AOX2和AOX3）在mRNA丰度上呈现出不同的发育趋势，因此AOX蛋白和能力的增加似乎涉及基因表达从AOX2向AOX3的转变。随着子叶老化，线粒体泛醌池的大小减小。我们讨论了这一因素以及其他因素可能如何影响由AOX表达的发育调控所导致的交替途径活性。
