Stanton : Dwarf Oats 



303 



ANOTHER CASE OF DOMINANT DWARFNESS IN OATS 



Figure 5. Progeny of one of the mother-dwarfs from the Winter Turf X Sixty-Day 

 cross. Note the normal (tall) segregates in row with dwarfs. Rows in foreground were 

 cut away to show dwarfs. The evidence that the dwarf character in this cross is dominant 

 is more conclusive than in the case of the prolific dwarf (Figure 4). 



In 1922, progenies from the three 

 dwarf and nineteen of the fifty-two 

 tall plants were grown in individual 

 five-foot rows at Aberdeen. The nine- 

 teen tall plants from selection 1009 

 b2-20-3-5 produced approximately 450 

 tall plants and no dwarfs, thus showing 

 a homozygous condition for the tall 

 character. Seed of the tall plants 

 from the other two dwarf-producing 

 progenies of 1921 was not sown indi- 

 vidually in 1922, but in bulk. One 

 panicle was taken from each plant, 

 thus making a composite sample of 

 seed. From this seed approximately 

 200 plants each from selection 1009 

 b2-20-3-6 and 1009 b2-20-3-7 were 



grown in 1922. These rows were care- 

 fully inspected but no dwarfs were 

 found. 



As to the behavior of the progenies 

 of the dwarfs, the number of tall and 

 dwarf plants produced by each is 

 shown in Table 2. 



According to the data shown in 

 Table 2, the three dwarf plants pro- 

 duced in 1 92 1 were heterozygous. They 

 produced a progeny of seventy-five 

 dwarf and twenty-two tall plants, thus 

 showing an approximate ratio of three 

 to one. The interesting feature in this 

 connection is that the dwarfs are 

 heterozygous, rather than the tall 

 plants, indicating a condition similar to 



