Evidence for the presence of protochlorophyllase in etiolated wheat seedlings.

Titration Curves of Etiolated and of Green Wheat Seedlings Reproduced with Buffer Mixtures.

Introduction Trhe titration curve for the expressed juice of etiolated wheat seedlings has a pronounced inflection above pH 8.0 (fig. 4), which does not occur in the curve for fully green seedlings (fig. 5). An intermediate type of curve, linear between p1I 8.5 and 11.0, is characteristic of very young seedlings just after their emergence from the ground. when, from the standpoint of chemical c...

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...

Endogenous rhythmicity of ethylene production in growing intact cereal seedlings.

Ethylene evolution from etiolated barley (Hordeum vulgare), wheat (Triticum aestivum), and rye (Secale cereale) seedlings during coleoptile growth followed a rhythmic pattern, with a period of about 16 h for barley and wheat and 12 h for rye seedlings. Leaf emergence disturbed the established rhythm of ethylene evolution.

Cytochrome Oxidase Content and Respiratory Rates of Etiolated Wheat and Barley Seedlings.

Catalase-chlorophyll Relationship in Barley Seedlings.

For over two decades H. VON EULER (3) and his coworkers have studied the relationship of catalase to chlorophyll. In their work they utilized various chlorophyll defective plants including genetic albinos, variegated, chlorotic and etiolated plants. In general, they found a parallelism between chlorophyll content and catalase activity. NAKAMURA (11) working with a number of higher and lower for...