SUPERPRODUCTION OF HEAVY MINICIRCULAR MITOCHONDRIAL-DNA IN AGING WHEAT COLEOPTILES

被引：23

作者：

KIRNOS, MD

ALEXANDRUSHKINA, NI

ZAGORSKAYA, GY

KIREEV, II

VANYUSHIN, BF

机构：

[1] A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, Moscow

来源：

FEBS LETTERS | 1992年 / 298卷 / 2-3期

关键词：

HEAVY WHEAT MITOCHONDRIAL DNA; SYNTHESIS; SIZE;

D O I：

10.1016/0014-5793(92)80033-D

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

On incubation of 7-day-old wheat seedlings in the presence of [H-3]thymidine, the radioactivity incorporated into coleoptile DNA is found to be localized mainly (> 95%) in the fraction of heavy mitochondrial DNA (H-mt DNA; rho = 1.716 gm/cm3). Upon long (48-72 h) incubation of cut-off seedlings in water, the amount of this DNA shows a dramatic increase and corresponds to about 10% of the total coleoptile DNA. H-mtDNA is represented by open circular molecules with a contour length varying from 0.12 to 0.6-mu-m. The functional role of this DNA is still unknown.

引用

页码：109 / 112

页数：4

共 18 条

[1]

ALEXANDRUSHKINA NI, 1990, BIOKHIMIYA, V55, P2038

[2]

BALLEYSERRES J, 1987, CURR GENET, V12, P49

[3] PROPERTIES AND NUCLEOTIDE-SEQUENCE OF A MITOCHONDRIAL PLASMID FROM SUNFLOWER [J].