摘要
Myo-inositol metabolism in plant edible organs has become the focus of many recent studies because of its benefits to human health and unique functions in plant development. In this study,MI contents in fruits were analyzed in two blueberry cultivars,cv ¢Bluecrop¢ and cv ¢Berkeley¢,along with the expression profiles of the key genes involved in MI biosynthesis and catabolism. Besides,the change patterns of the corresponding enzyme activities were analyzed. The results showed that some differences exist in the change profiles of the MI levels between the two cultivars. Furthermore,two VcMIPS genes,one VcIMP gene and one VcMIOX gene were isolated for the first time from blueberry fruits. Specifically,VcMIPS 1/2 and VcMIOX encoded the rate-limiting enzymes in MI biosynthesis and oxidation,respectively. The expression patterns of VcMIPS2,VcIMP and VcMIOX genes showed a relationship with the change profiles of MI content during fruit ripening. The results were further confirmed by the analyses of the enzyme activities. Overall,the results indicated that both MI biosynthesis and oxidation played important roles in determining MI levels in the development of blueberries. The current results will provide new information for us to understand the mechanisms regulating MI accumulation and the roles of MI in As A biosynthesis during the development of blueberries.
Myo-inositol metabolism in plant edible organs has become the focus of many recent studies because of its benefits to human health and unique functions in plant development. In this study,MI contents in fruits were analyzed in two blueberry cultivars,cv ¢Bluecrop¢ and cv ¢Berkeley¢,along with the expression profiles of the key genes involved in MI biosynthesis and catabolism. Besides,the change patterns of the corresponding enzyme activities were analyzed. The results showed that some differences exist in the change profiles of the MI levels between the two cultivars. Furthermore,two VcMIPS genes,one VcIMP gene and one VcMIOX gene were isolated for the first time from blueberry fruits. Specifically,VcMIPS 1/2 and VcMIOX encoded the rate-limiting enzymes in MI biosynthesis and oxidation,respectively. The expression patterns of VcMIPS2,VcIMP and VcMIOX genes showed a relationship with the change profiles of MI content during fruit ripening. The results were further confirmed by the analyses of the enzyme activities. Overall,the results indicated that both MI biosynthesis and oxidation played important roles in determining MI levels in the development of blueberries. The current results will provide new information for us to understand the mechanisms regulating MI accumulation and the roles of MI in As A biosynthesis during the development of blueberries.
引文