By N. J. Chinoy, I. C. Dave, Y. D. Singh, O. P. Saxena, A. V. Vyas (auth.), N. J. Chinoy, I. C. Dave, Y. D. Singh, O. P. Saxena, A. V. Vyas (eds.)
There is a paucity of data at the dynamics of Ascorbic Acid (AA) turnover in terms of germination, metabolism, development, differentiation and improvement of a plant and in these present process tension of varied kinds. in presowing therapy of seeds and so forth. The turnover of AA performs a massive position throughout the juvenile part of development of a plant and has an important touching on its next progress, improvement and maturation. The important impression of presowing therapy of seed with Ascorbic Acid (AA) + H2 O highlights the validity of the AA-nucleic acid 2 protein metabolism suggestion of development and improvement of plan ts. throughout the process the final 30 years, paintings has been undertaken via the writer and his collaborators at the meta bolic drifts of regulatory ingredients in the course of juvenile, vegetative, reproductive and senescent levels. an important of those progress regulatory components used to be came upon to be Ascorbic Acid. The dynamiC function of AA turnover is published through its keep watch over of charges of metabolic strategies in addition to these of enzymic reactions which paves the best way to "New Genetics".
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Extra resources for The Role of Ascorbic Acid in Growth, Differentiation and Metabolism of Plants
Example text
AA derives its acidic property not from a carboxylic group but its enolic hydroxyl groups. , dichlorophenolindophenol and adrenochrome. The latter is a highly toxic substance and combines with -SH groups to form -SS. The involvement of AA in several enzymatic activities have been highlighted in Chapter 11. AA is also associated with 23 hydroxylation of dopamine to noradrenaline. tryptophan to form serotonin and p-hydroxypheny1-pyruvate to form homogentisic acid in animals. The dissolution of fat and chole- sterol in the body are done by AA.
J. and Seethalakshmi. 1978; Chinoy. J. and Rao. 1979; Chinoy. J. et a1 •• 1979). Apart from other factors. +2 and cobalt stimulate the synthesis of L-AA traces of Mn from L-gulonolactone (Sebrell and Harris. , 1968; Kutsky, 1973). 2. ASG in animals The existence of bound ascorbic acid was reported in the liver of the pig by Summerwell and Sealock (1952) but their method was criticiz~d by Lewis et al. (1960). Later. Malakar (1963) found bound AA in goat liver and Chinoy. J. (1978) has reported its presence in several animal tissues by using the DCPIP method of Chinoy et al •• (1976 a).
1978). Most of the studies in animals support the fact that microsomal enzymes are involved in the conversion of Lglucuronolactone to L-AA. , 1970; Lewin, 1976). sis of L~AA Thus the biosynthe- in rats occurs from D-glucose and uronic as well as aldonic acid derivatives. As in plants, lactone dehydro- genase enzymes from animal tissues have also been reported (see Mapson, 1967). Moreover, a number of lactonases have been found in animal tissues which use free L-gulonic or L-galactonic acid as substrates and convert them to L-AA via their y-lactones (Hassan and Lehninger, 1956; Bublitz and Lehninger, 1961; Shimazono and Mano, 1961).
