Vitamin A Formation in the Etiolated Wheat Shoot

Influence of Cell Age on Chlorophyll Formation in Light-grown and Etiolated Wheat Seedlings.

A method is described for relating the age of a cereal leaf cell to its distance from the leaf base. The rates of chlorophyll synthesis per plastid in the first leaf of light-grown and of greening etiolated seedlings of wheat (Triticum aestivum, var. Maris Dove) increase with cell age. Normally developing plastids of light-grown wheat take over 24 hours to reach the chlorophyll a/b ratio charac...

Evidence for the presence of protochlorophyllase in etiolated wheat seedlings.

Tlhe biosynthetic pathway to chlorophyll a (chl a) is now quite complete in terms of porphyrin intermediates (3, 8). The biosynthetic pathway to protochlorophyll a (Pchl a) is undoubtedly identical with that of chl a to the protochlorophyllide a (Pchlide a) step, however, the sequence of steps from Pchlide a to Pchl a still remains unknown (1, 9). The production of Pchl a by etiolated plants i(...

Simulating winter wheat shoot apex phenology

Shoot meristem formation and maintenance.

The shoot apical meristem of higher plants is a self-maintaining stem cell system which gives rise to the entire above-ground part of a plant. In the past year, genetic and molecular studies have provided increasing insight into the processes of shoot meristem formation and maintenance, as well as into the relation between the apical meristem and its products.

Shoot Meristem Formation in Vegetative Development.

The majority of the plant body is derived from the activities of groups of specialized cells, known as apical meristems, at the growing tips. In a typical flowering plant, the shoot apical meristem (SAM) gives rise to the bulk of the above-ground portion of the plant, whereas root meristems give rise to the bulk of the subterranean plant body. Of course, not all plants are typical, and numerous...