EXPRESSION OF THE GENES FOR THE ALPHA-SUBUNIT AND BETA-SUBUNIT OF PYROPHOSPHATE-DEPENDENT PHOSPHOFRUCTOKINASE IN GERMINATING AND DEVELOPING SEEDS FROM RICINUS-COMMUNIS

被引:15
作者
BLAKELEY, SD [1 ]
CREWS, L [1 ]
TODD, JF [1 ]
DENNIS, DT [1 ]
机构
[1] QUEENS UNIV,DEPT BIOL,KINGSTON K7L 3N6,ONTARIO,CANADA
关键词
D O I
10.1104/pp.99.3.1245
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Various tissues from both germinating and developing castor seeds (Ricinus communis L.) have been analyzed for the level of expression of the genes for the alpha- and beta-subunits of pyrophosphate-dependent phosphofructokinase (PFP). In tissues in which PFP is expressed, there is a single mRNA species of approximately 2 kilobases for each of the subunits. In germinating endosperm, the gene for the alpha-subunit is expressed at an earlier time after imbibition than that for the beta-subunit, whereas in developing castor seed endosperm, both genes are highly and coordinately expressed. During seedling development, there is tissue-specific expression of the two genes. Tissues in which there is a high level of mRNA correspond with tissues in which both subunits of PFP can be detected. The differential expression of the two subunit genes in germinating endosperm does not result in the presence of the alpha-subunit polypeptide in the absence of the beta-subunit polypeptide. Southern analysis of castor genomic DNA indicates the presence of a single gene for both the alpha- and beta-subunits of PFP in contrast with potato, in which there are at least two genes for each subunit.
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页码:1245 / 1250
页数:6
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