14. Differential dominance in number of kernel rows. One of the F_{1}'s used by Dr. Wiggans in the production of double-cross 29-3 is a cross of a 12-row inbred line #2 (Onondaga White) with an 8-row line #1 (Lucets Favorite). The F_{1} plants show a high percentage of 8-row ears. Golden Cross Bantam, on the other hand, has a considerable percentage of 12-row ears, though also a cross of a 12-row line (Purdue 39) with an 8-row line (Purdue 51). This striking difference suggested a comparison of F_{1}'s from crosses of the two 8-row lines, 1 and 51, noted above, with ten 12-row lines, including 2 and 39 noted above. The results of one season's test are given in summary form in the accompanying tabular statement which shows the mean number of kernel rows in F_{1} of crosses between 8-row and 12-row inbred lines.

Inbred lines | F_{1} crosses with |
||||||

Line 1 | Line 51 | ||||||

Designation | Number plants | Mean number rows | Number plants | Mean number rows | Number plants | Mean number rows | Difference in number rows |

1 | 57 | 7.84 | |||||

51 | 88 | 7.95 | |||||

2 | 49 | 12.04 | 82 | 8.76 | 88 | 10.34 | 1.58 |

3 | 59 | 12.27 | 92 | 9.07 | 86 | 10.59 | 1.51 |

4 | 63 | 12.38 | 86 | 9.16 | 80 | 9.92 | .79 |

39 | 95 | 12.02 | 71 | 9.77 | 90 | 11.36 | 1.59 |

II | 59 | 12.34 | 56 | 9.57 | 86 | 9.93 | .36 |

III | 69 | 11.80 | 75 | 9.28 | 47 | 9.53 | .25 |

VI | 50 | 12.04 | 60 | 8.90 | 54 | 9.89 | .99 |

VII | 107 | 12.28 | 120 | 9.15 | 91 | 10.13 | .98 |

B | 97 | 12.10 | 85 | 9.04 | 73 | 10.41 | 1.37 |

G | 74 | 12.11 | 93 | 9.05 | 37 | 10.05 | 1.00 |

Average 12-row and F _{1} lines |
12.14 | 9.18 | 10.21 | 1.03 |

In every case the F_{1} row number was higher (0.25 to 1.59) where line 51 was the 8-row parent than where line 1 was used; and the average difference was one kernel row. Of the twenty F_{1} lots, the lowest row number was in the cross of I with 2 and the highest in 51 with 39. The frequency distribution of the four F_{1} lots from crosses of these four lines are as follows:

Inbred lines | Frequency distribution for row number | ||||||

8-row | 12-row | 8 | 10 | 12 | 14 | Total | Mean |

1 | 2 | 51 | 31 | 82 | 8.76 | ||

1 | 39 | 16 | 47 | 8 | 71 | 9.77 | |

51 | 2 | 14 | 45 | 29 | 88 | 10.34 | |

51 | 39 | 1 | 29 | 58 | 21 | 90 | 11.36 |

Not only do the two 9-row lines differ, #1 tending more strongly than #51 to give low row number in F_{1}, but #39 tends more strongly to give high row number than does #2.