PLASTID STUDIES IN GENETIC TYPES OF MAIZE: ARGENTIA CHLOROPHYLL

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Abstract
Argentia seedlings, depending principally upon temp., vary from pure albino to almost normal green in the stage when the first leaf emerges from the coleoptile. Chloroplastid development proceeds more rapidly in the cells adjacent to the conductive cells of the vascular bundles and most rapidly in the cells adjacent to the conductive cells of the midrib. This gives the argentia pattern, which consists in the longitudinal extension of green veins through an otherwise white or cream colored leaf blade. The argentia pattern is inherited as a simple Mendelian recessive. Backcrosa data indicate 26.03% crossing over between Ar and Sh and 10.81% between Ar and Wx. The order of the genes is concluded to be C-Sh-Wx-Ar. Determinations of total chlorophyll and of the individual plastid pigments were made on green and argentia seedlings from the same pedigrees. Argentia seedlings contained less total chlorophyll than the green. The pigments occurred in the same proportions in both types of plants. The dry weight of green and of argentia seedlings was determined for plants from which the endosperms had been removed when the first leaf was newly exserted from the coleoptile and for plants not having the endosperm removed. The dry weight of green seedlings was reduced by removal of the endosperm whereas that of argentia plants was not reduced significantly.

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