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Regulation of invertase activity in sugar beet tissue cultures


Fiziologiya Rastenii (Moscow) 29(6): 1188-1194
Regulation of invertase activity in sugar beet tissue cultures
In tissue cultures, derived from sugar beet root and from the cotyledons of 10-day-old seedlings, some differences were observed in their ability to activate various invertase forms. This suggests different mechanisms for controlling activities of this enzyme. In intact roots and tissue culture the regulation of acid invertase activity occurs either by repression and derepression of the synthesis of invertase protein or by an endogenous inhibitor affecting synthesized enzyme molecules. The invertase inhibitor, of a protein nature, was isolated from root tissue culture. The inhibitor was less active than the one isolated from the stored root. No invertase inhibitor was found in the tissue culture derived from cotyledons. In sugar beet root tissue culture, the weakened mechanism for controlling acid invertase activity fails to provide conditions for performing a distinct sugar-accumulating function. Some metabolic specificity characteristic of the stored root is still retained.


Accession: 006288872



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