Abstract
An alfalfa mutant with yellow cotyledons and yellow leaves is described. The few seedlings that live to maturity are dwarfs. The character is determined by a single recessive gene (Xantha-1 or X1) inherited tetrasomically. A histological study of the leaf morphology indicated that the tissues of the mutant have similar structure to those of green leaves. The plastids are well formed but take up stain weakly in comparison with the plastids in normal green leaves.

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