Influence of growth temperature upon cyst length and sperm head number in parental strains Prunay or Delhi and several backcross generations
| . | Cyst length (mm) . | . | . | Sperm head number . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Generation . | 21°C . | High T (°C) . | % Reduction . | 21°C . | High T (°C) . | % Reduction . | ||||
| Prunay | 1.933±0.012 | 1.429±0.023 | 26.1 | 58.15±1.10 | 58.25±1.18 | NS | ||||
| F1 | 1.918±0.028 | 1.278±0.019 | 33.4 | 61.35±0.87 | 48.75±1.98 | 18.9*** | ||||
| G3 | 1.956±0.015 | 1.289±0.020 | 34.1 | 57.45±0.82 | 58.95±1.11 | NS | ||||
| G5 | 1.878±0.019 | 1.426±0.016 | 24.1 | 61.25±0.86 | 55.15±1.18 | 10.0*** | ||||
| Delhi | 1.892±0.021 | 1.125±0.012 | 40.5 | 59.05±1.25 | 54.45±1.76 | 7.8* | ||||
| F1 | 1.891±0.029 | 1.252±0.038 | 33.7 | 61.45±0.57 | 55.15±1.62 | 10.3** | ||||
| G3 | 1.942±0.040 | 1.102±0.023 | 43.3 | 54.95±1.28 | 58.05±0.99 | NS | ||||
| G5 | 1.908±0.014 | 1.066±0.018 | 44.1 | 56.70±1.24 | 54.00±1.65 | NS | ||||
| . | Cyst length (mm) . | . | . | Sperm head number . | . | . | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Generation . | 21°C . | High T (°C) . | % Reduction . | 21°C . | High T (°C) . | % Reduction . | ||||
| Prunay | 1.933±0.012 | 1.429±0.023 | 26.1 | 58.15±1.10 | 58.25±1.18 | NS | ||||
| F1 | 1.918±0.028 | 1.278±0.019 | 33.4 | 61.35±0.87 | 48.75±1.98 | 18.9*** | ||||
| G3 | 1.956±0.015 | 1.289±0.020 | 34.1 | 57.45±0.82 | 58.95±1.11 | NS | ||||
| G5 | 1.878±0.019 | 1.426±0.016 | 24.1 | 61.25±0.86 | 55.15±1.18 | 10.0*** | ||||
| Delhi | 1.892±0.021 | 1.125±0.012 | 40.5 | 59.05±1.25 | 54.45±1.76 | 7.8* | ||||
| F1 | 1.891±0.029 | 1.252±0.038 | 33.7 | 61.45±0.57 | 55.15±1.62 | 10.3** | ||||
| G3 | 1.942±0.040 | 1.102±0.023 | 43.3 | 54.95±1.28 | 58.05±0.99 | NS | ||||
| G5 | 1.908±0.014 | 1.066±0.018 | 44.1 | 56.70±1.24 | 54.00±1.65 | NS | ||||
Values are means ± s.e.m.
For details of backcross generations, see Table 2.
High T, developmental temperature was 31°C in all cases except Prunay(30°C).
For cyst length, 50 cysts were measured for parents, but only 25 for generations F1—G5. The reduction in cyst length due to a development at high temperature is highly significant in all cases,and % length reduction is given.
For sperm head number, 20 cysts were investigated in all cases. A slight reduction in sterile males is often observed, and significant cases are indicated. *P<0.05, **P<0.01, ***P<0.001; NS, non significant.