TABLE 3.
Comparison of bristle, antenna, and arista phenotypes in viable combinations of l(2)k168-14 and stubarista
| Combina-tion no. | Genotype | Phenotypea
|
||
|---|---|---|---|---|
| Bristles | Antenna | Arista | ||
| 1 | Wild type | + | + | + |
| 2 | l(2)k168-14/+ | Weak Minute | + | + |
| 3 | l(2)k168-14/+; Dp(1;3)sta/+ | Weak Minute (like combination 2) | + | + |
| 4 | sta2; Dp(1;3)sta/+ | Shorter and thinner than in combination 3 | Fifth segment enlarged | Branches shorter and axis proximally thicker than in wild type |
| 5 | Df(1)sta/sta2; Dp(1;3)sta/+ | Shorter and thinner than in combination 4 | Third segment hairless and smaller than in combination 4 | Similar to combination 4 |
| 6 | Df(1)sta; Dp(1;3)sta/+ | Shorter and thinner than in combination 5 | Third segment smaller (0.5×) than in combination 5 | As in combination 5, albeit with a shorter axis |
| 7 | sta2; l(2)k168-14/+; Dp(1;3)sta/+ | Shorter and thinner than in combination 5 | Third segment smaller than in combination 5, with a slight protrusion towards arista | As in combination 5, but slightly shorter (albeit still longer than in combination 6) |
| 8 | Df(1)sta/sta2; l(2)k168-14/+; Dp(1;3)sta/+ | Similar to combination 7 | Third segment similar to combination 7, but even smaller | Similar to combination 7 |
| 9 | Df(1)sta; l(2)k168-14/+; Dp(1;3)sta/+ | Shorter and thinner than in combination 8 | Smaller than in combination 8, with a marked protrusion towards the arista | Axis shorter (0.5×) and thicker than in combination 8, with an equal number of shorter branches |
a
With respect to the length and width of the scutellar and dorsothoracal bristles, as well as the size of the antennae, the various genetic combinations between l(2)k168-14 and the sta alleles can be organized in the following phenotypic series, ranging from normal (combination 1) to the most severe size reduction, as observed in combination 9. For the length and width of the bristles, the combinations were as follows: 1 > (2 = 3) > 4 > 5 > 7 > 8 > 6 > 9. For the sizes of the antennae, the combinations were as follows: (1 = 2 = 3) > 4 > 5 > 7 > 8 > 6 > 9. In addition, all of these combinations were found to be fertile.