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_ LINDSTROM, GENETICAL RESEARCH WITH MAIZE 339 
Yellow seedlings. — In this type the normal green component of 
chlorophyll is suppressed, leaving only a distinct yellow pigment which 
‘is a mixture of the xanthophyll and carotinoid pigments. Yellow (//) 
are recessive in inheritance but the L/ factor pair shows some interes- 
ting and peculair interactions with the other seedling factors. 
The interrelations or interactions of these three fundamental factors 
for chlorophyll development in the seedling stage have been determi- 
ned by Lindstrom (1921). When a normal green plant which is hetero- 
zygous for all three factor pairs (Ll Vv Ww) is self-pollinated, the pro- 
geny are of the following types: — 
27°L V W — green 3 L v w — white (albino) 
9 1 V W — green 3 1 vW — virescent-yellow 
9 L v W — virescent-white ‘3 1 V w — pure yellow 
9 L V w — white (albino) 1 2v w — pure yellow 
The following modified dihybrid rations occur: — 
BEVuWw — 9:3:4 LIVV Ww — 12:3:1 
RW —.green Gel. VW — green 
Ber dv. We — virescent-white 3 2 V W. — green 
3 L V w — white 3 L V w — white 
1 Lv w — white 1 1 V.w — yellow 
LIVuWW — 12:3: 1 U Vv Ww— 9:3:4 
PROG: green GATE green 
3 1 V W  — green 31 v W — virescent-yellow 
3 L v W — virescent-white 32 V w — pure yellow 
1 2 y W — virescent-yellow 1 / v w — pure yellow 
The surprising relation in the factor interactions noted above is that 
w is capable of inhibiting the green component of chlorophyll but not 
the yellow pigments (xanthophyll and carotin) The v factor acts with 
_ either the green or yellow pigments. 
While the above may be classed as fundamental factors for chloro- 
phyll development in the seedling stage of maize, there are other fac- 
tors involved. For example, evidence is at hand to prove conclusively 
that there really are at least three Ww pairs of factors. Ratios of 9 
