Garber: Origin of False Wild Oats 



43 



early in maturing. The sample grown 

 at University Farm was obtained from 

 the Kansas Agricultural Experiment 

 Station. Two plants of homozygous 

 false wild Aurora were found in the 

 Aurora variety. A careful search in 

 the rod rows did not reveal a single 

 apparently heterozygous plant. The 

 two homozygous false wild Aurora 

 plants bred true. However, one of the 

 19 plants selected as pure Aurora gave 

 progeny which segregated into 6 homo- 

 zygous false wild Aurora and 13 which 

 were apparently Aurora. It is possible 

 that the phenotypes of homozygous 

 Aurora and heterozygous false wild 

 Aurora are very similar. More evidence 

 is needed to clear up this point. As in 

 Victory and Garton No. 784, the false 

 wild Aurora seed has the same charac- 

 teristics as the variety in which it 

 appeared except in awn development, 

 articulation, and pubescence. (See 

 Figures 21 and 23.) 



F2 GENERATIONS OF CERTAIN OAT 

 CROSSES 



In connection with the consideration 

 of the origin of false wild oats, certain 

 F2 generations of fatua-sativa and 

 fatua-orientalis crosses are of interest. 

 The crosses mentioned below and the 

 plants reported above were grown in 

 the same nursery and the same year 

 at Morgantown. 



The F2 generation of a cross between 

 a brown, hairy wild oat and Victory 

 showed unmistakable evidence of segre- 



gation with respect to panicle type; 

 size, shape, and color of seed; and 

 amount of hair on the lemma as well as 

 around the seed articulation. The 

 segregation with respect to the charac- 

 ter of the articulation was approxi- 

 mately one fatua to three non-fatua 

 types as has been observed by others 

 (Zade, 1912; Surface, 1916). Differ- 

 ences in panicle type were also obtained 

 in the F2 generation. The panicle of 

 the brown, hairy wild parent is much 

 longer, and has longer branches than 

 the panicle of Victory. In the F2 

 generation of another cross, Victory 

 with a yellow wild oat, distinct segrega- 

 tion occurred with regard to the same 

 characters mentioned above except 

 pubescence on the lemma. The yellow 

 wild parent used in this cross has hair 

 only around the articulation and not 

 on the other regions of the lemma. (See 

 Figure 23.) 



The same wild parents were crossed 

 reciprocally with Garton 748, a variety 

 similar to Garton 784 except in awn 

 development and length of rachilla on 

 the lower seed. False wild oats were 

 found in the variety Garton 784. The 

 F2 generations of these crosses exhibited 

 segregation similar to that noted in 

 connection with the Victory-fatua 

 crosses. In the Garton 748-fatua 

 crosses, however, the difference in pani- 

 cle type between the parents is more 

 marked. Garton 748 is a side-panicled 

 and non-liguled form. Figures 2 and 5 

 illustrate some of the F2 segregates 



Table II: Data showing the segregation with respect to ligiiles in the Ft generations of certain 



oat crosses 



