The Relation of the First Chromosome Pair to Date of Fruit Ripening in the Tomato (Lycopersicum Esculentum).

HE linear order of four genes in chromosome I of the tomato has T been well established, principally from data obtained by LINDSTROM (1932) and MCARTHUR (1934). LESLEY (1931) has shown one of the genes in this linkage group to be related to resistance to the curly top virus disease, and LINDSTROM (1932) has demonstrated a decided relationship between fruit size and the genes in this pair of chromosomes. YEAGER (1937) has data that demonstrate the presence of a fifth gene in the group and considers this to be a major gene for fruit shape and size. The four genes that have been located by linkage tests and their arrangement are as follows : d dwarf plant recessive to D, standard plant p pubescence on the fruit recessive to P, smooth fruit o pear shape fruit recessive to 0, round fruit s compound inflorescence recessive to S, simple inflorescence