Department of Agronomy, Waite Agricultural Research Institute, The University of Adelaide, Glen Osmond, South Australia.
Theor Appl Genet. 1976 Nov;48(6):289-97. doi: 10.1007/BF00264961.
The effect of frequency-dependent advantage in wheat was investigated by growing F1. hybrid seeds of the crosses (Warimek X Halberd) and (Wariquam x Halberd) in a stand of Halberd at 5 frequencies: 4 %, 6.25 %, 11.11 %, 25 % and 50 %. A reduction of 35 % to 40 % in grain yield of individual plants was observed with both hybrids as their frequencies changed from 4% to 50 %. A similar trend with frequency was noted for several other plant characteristics, including total grain number, particularly with those measured towards the end of the growing season. Halberd plants did not show a corresponding increase as their frequency declined from 96 % to 50%. - The following season, 76 F4 lines from the cross (Warimek X Halberd) and 70 F4 lines from (Wariquam x Gabo) were grown at frequencies of 6.25% and 18.75% in machine sown stands of Wariquam and Halberd, respectively. Again grain yield decreased as genotypic frequency increased. Furthermore, there was a positive correlation between frequency-dependent advantage and relative grain yield, suggesting that high yielding genotypes show a greater advantage at low frequencies than lower yielding ones.
研究了小麦中频率依赖性优势的影响，方法是在 Halberd 群体中种植 Warimek X Halberd 和 Wariquam x Halberd 的 F1 杂种种子，在 5 种频率下：4%、6.25%、11.11%、25%和 50%。随着杂种频率从 4%变为 50%，个体植物的籽粒产量降低了 35%至 40%。对于其他几个植物特性，包括总籽粒数，也观察到了类似的频率趋势，特别是在生长季节末期测量的那些特性。Halberd 植物并没有随着其频率从 96%下降到 50%而相应增加。- 下一季，在 Wariquam 和 Halberd 的机器播种群体中，分别以 6.25%和 18.75%的频率种植了 Warimek X Halberd 杂交的 76 个 F4 系和 Wariquam x Gabo 杂交的 70 个 F4 系。随着基因型频率的增加，籽粒产量再次下降。此外，频率依赖性优势与相对籽粒产量之间存在正相关关系，这表明高产量基因型在低频率下比低产量基因型具有更大的优势。
