不同抗源基因棉主要性状杂种优势及差异分析

主要对三种类型转基因抗虫棉包括国产单价、国产双价及美国单价抗虫棉杂种F1代主要性状的杂种优势及差异进行了分析。结果表明:在产量与产量性状方面,F1霜前皮棉产量、子棉产量、铃重和衣分具有明显的正向优势,其优势组合率分别为95.80%、83.33%、95.45%和87.50%,竞争优势(CH%)分别为27.65%、14.26%、13.13%和11.95%。在农艺性状方面,株高具有明显的正向优势,其竞争优势值为22.64%,而果枝数和单株结铃数优势不明显,其竞争优势分别为2.78%和 7.33%。在纤维品质方面,2.5%跨长、整齐度、比强度均为负优势,伸长率和麦克隆值均为正向优势。不同转基因抗虫棉相比,以sGK321双价抗虫棉为亲本的杂种平均竞争优势CH%最高,以GK12为抗虫亲本的组合伸长率竞争优势最高,以晋棉26为抗虫亲本的组合比强度竞争优势最高,以新棉33B为抗虫亲本的组合2.5%跨长、整齐度和麦克隆值的竞争优势最高。

Analysis on Heterosis and Diversity of Main Characters of Different Transgenic Cotton

Heterosis and diversity of main characters of 12 hybrids which were made by using four different transgenic cotton from China and American containing Bt gene and CpTI gene respectively as female parent,and three normal varieties as male parent,were analyzed .The results showed that: The heterosis of lint yield before frost, total yield,bollweight and lint percentage were apparent in heterosis ratio to the check, which were 95.80%, (83.33%),95.45% and 87.50%,respectively,and 27.65%,14.26%,13.13% and 11.95%,respectively for CH%. Lint yield before frost of sGK321 have the highest heterosis; Heterosis of plant height was obvious, with 22.46% of CH%,and heterosis of number of fruit branch, boll number per plant were unconspicuous, with 2.78% and -7.33% of CH%,respectively; heterosis(CH%) of (2.5%) span length, fiber uniformity,fiber strength were (-2.01),0.17,11.94,respectively (positive), while CH% of elongation rate,micronaire were 4.29%, 13.37%,respectively (negative ) . Elongation rate of GK12 has the highest heterosis for CH%; fiber strength of Jinmian 26 has the highest heterosis for CH%, and heterosis for CH% of 33B in 2.5% span length , fiber uniformity, and micronaire were the hightest.