Effect of various salts on the synthesis of ascorbic acid and carotene in cress seedlings

Ascorbic Acid Formation in Potato Tuber Slices

“…Sugars have most frequently been suggested as precursors of ascorbic acid in plants (1,6,15,20) and there is evidence relating the process to both photosynthesis (24,25) and respiration (11,19,26). However, the most concrete suggestion for a mechanism of ascorbic acid synthesis has come from the work of SMYTHE and KING (23) who showed that certain glycolytic intermediates may increase synthesis in rat tissues.…”

“…Previous work on this problem has been chiefly with germinating seedlings (15,16) or leaf tissue (1,24,25) in which photosynthesis or rapid growth also occurred. The accumulation of ascorbic acid in potato tuber tissue, pointed out by GUTHRIE (11), STEWARD and PRESTON (26), PROKOSHEV (19), and others, indicated, therefore, that this might be favorable material for studying ascorbic acid synthesis, especially in relation to respiration.…”

Ascorbic Acid and Dry Matter Accumulation in Turnip and Broccoli Leaf Discs After Infiltration With Inorganic Salts, Organic Acids, and Some Enzyme Inhibitors

“…In the studies by MAPSON et al (13,14) growth and, in some cases, photosynthesis was occurring simultaneously, and these workers have not described in detail the influence of their treatments upon these processes in cress seedlings. In the present studies photosynthesis was a concomitant process with ascorbic acid accumulation.…”

“…ABERG (2) has discussed such a possibility. MAPSON et al (14) have suggested that hexoses may be the precursors of ascorbic acid. ABERG (2) stimulated ascorbic acid accumulation in excised tomato leaves in the dark by feeding them sucrose, but with leaves of other plants the ascorbic acid did not increase in the dark when they were fed sucrose.…”

“…However, some tissues make it possible to separate ascorbic acid accumulation to some extent from other processes. Germinating seedlings offer such an approach, one which has been used recently by MAPSON et al (13,14). Discs of leaf tissue offer another approach to the problem (20).…”