AN ABNORMAL GROWTH MUTANT IN MAIZE HAS A DEFECTIVE MITOCHONDRIAL CYTOCHROME-OXIDASE GENE
AN ABNORMAL GROWTH MUTANT IN MAIZE HAS A DEFECTIVE MITOCHONDRIAL CYTOCHROME-OXIDASE GENE
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DOI：
10.1105/tpc.2.2.107
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发表时间：
1990-02-01
期刊：
影响因子：
11.6
通讯作者：
LAUGHNAN, JR
中科院分区：
文献类型：
--
作者：
NEWTON, KJ;KNUDSEN, C;LAUGHNAN, JR
我们描述了一种新的母系遗传玉米突变，非染色体条纹5（NCS5），对植物生长和产量产生不利影响。突变体植株的特征在于高度降低、叶片上有缺陷的黄色条纹和穗上的败育籽粒。NCS5条纹植物进行正常和部分删除的线粒体细胞色素氧化酶亚基2基因的版本，并表现出大大降低水平的cox 2转录相比，nonstripped对照植物。其他线粒体基因及其mRNA不受影响。因此，有缺陷的植物表型与功能性细胞色素氧化酶亚基2基因的数量减少相关。NCS5突变体线粒体基因组似乎是通过扩增一种罕见的同源重组产物而产生的。
We describe a new maternally inherited maize mutation, nonchromosomal stripe 5 (NCS5), that adversely affects plant growth and yield. Mutant plants are characterized by reduced height, defective yellow striping on leaves, and aborted kernels on ears. NCS5 striped plants carry both normal and partially deleted versions of the mitochondrial cytochrome oxidase subunit 2 gene and exhibit greatly reduced levels of cox2 transcripts when compared with nonstriped control plants. Other mitochondrial genes and their mRNAs are not affected. Thus, the defective plant phenotype is correlated with a reduction in the number of functional cytochrome oxidase subunit 2 genes. The NCS5 mutant mitochondrial genome appears to have arisen by amplification of a rare homologous recombination product.