Untersuchungen über den Ascorbigengehalt von Kohlrabi(Brassica oleracea v.gongylodes) während der Vegetation und den Zusammenhang zwischen Ascorbigen und Wachstum bei den Pflanzen der Familie Brassicacae

Indole Auxins

“…The biogenesis of radioactive ascorbigen from tryptophan-3-14C in Savoy cabbage [Kutacek et at. (108)] has confirmed the earlier work, which revealed ascorbigen formation after tryptophan was injected into the bulb of kohlrabi (110). Further experiments will perhaps decide the relative im portance of the pathways via IPyA and indole-3-pyruvaldehyde.…”

“…Ascorbigen undergoes alkaline hydrolysis to give small yields of IAA (160,161), and IAA is also formed in ammoniacal solvents during chromatography (107). Ascorbigen is also rapidly degraded after being infused into leaves of cabbage and kohlrabi, but IAA was not detected (110). Since ascorbigen is inactive in the oat coleoptile test (161) its conversion to IAA in this tissue would appear to be negligible throughout the duration of the test.…”

“…The ascorbigen in various organs of Brassicae not only paralleled the con centration of IAA present but was metabolised at a high rate, indicating that it was probably participating in growth (110). The highest levels were found in the tips (0.66 per cent), and the high levels in young leaves decreased with age, whereas the amounts of ascorbigen obtained from the buds increased with their development; it could not be found in the roots [Kutacek et al (110)].…”

GLUCOSINOLATE CONTENT OF DEVELOPING RAPESEED (Brassica napus L. ’Midas’) SEEDLINGS

“…From these studies it has been inferred that the abundance, or relative abundance, of individual glucosinolates can vary appreciably with development of the plant (Fenwick et al 1983 (Bergmann 1970;Cole 1978Cole , 1980Kondo et al 1985) or dry mass (Kutacek et al 1957;Kutacek and Kefeli 1968;Chong and Bible 1974;Uppstrom 1983;Palmer er al. 1987 glucosinolates, 4,hydroxy-3-indolylmethyl, 3-indolylmethyl, 4-methoxy-3-indolylmethyl and l-methoxy-3-indolylmethyl (Sang et al 1984).…”