PLANT CoLors IN MAIzE 11 
SUN RED, TYPE II 
Sun red, tho not a common color type, is encountered in a few varieties 
of sweet corn and pop corn. It is always produced in F»2 of certain crosses, 
notably in purple x green. 
While this type is less highly colored than Ia, it has athe strong color 
that it is not easily distinguished from the latter in early stages of growth. 
At the flowering stage, type Ila is sharply differentiated from type Ia in 
several respects. The staminate inflorescence of Ila is lighter than that 
of Ia, and the anthers are deep pink instead of purple (Plate III, 1). In 
type Ila, pigmentation of the culm, the leaf sheaths, and the husks is 
limited almost wholly to parts exposed to sunlight, hence the name sun 
red. The inner husks are therefore without red color, and rarely does 
much color develop in any but the outer layer of husks (Plate V, 3) not- 
withstanding the fact that sufficient light penetrates to the inner husks to 
induce the development of some chlorophyll in them. A tassel inclosed 
in a black paper bag produces no red color in either glumes or anthers 
(Plate VIII, 4). Since the color of sun red plants is so largely superficial, 
it disappears almost wholly from mature plants thru weathering (Plate 
VII, 2). Sun red plants have either red or colorless, but never cherry, 
pericarp, and either purple, red, or colorless aleurone. 
Sun red of type Ilg differs from Ila merely in having green instead of 
pink anthers. Type IIb, known as weak sun red, differs from Ila in the 
lesser intensity and extent of its pigmentation. Particularly the leaf 
sheaths and the husks are less highly colored than in type Ila. Often 
the color of the husks develops in alternate dark and light bars parallel 
to the upper margins of the overlapping husks (Plate V, 4). Types Ib 
and Ilg have the same pericarp and aleurone colors as IIa. 
DILUTE PURPLE, TYPE III 
The dilute purple type, as well as the sun red, occurs regularly in F»2 
of purple x green, and most of the dilute purple material in the writer’s 
cultures came originally from this and other crosses. It was first 
observed in the progeny of such crosses in 1909. Recently two stocks of 
this color type have been received from G. N. Collins, one obtained from 
the Hopi Indians of southwestern United States and the other from 
Bolivia. 
