The seed yield increase of the hybrids and their derived Mimics compared to parents is associated with increased plant height and inflorescence branch number which are correlated with decreased expression of FT, SOC1 and FUL. In Arabidopsis, plant size has been extensively investigated, but few studies have been carried out on seed yield heterosis. In hybrids between Columbia (Col) and Landsberg erecta (Ler), and Wassilewskija (Ws) and Ler, there was significant seed yield heterosis. F6/F7 Hybrid Mimics derived from hybrids of each of the two systems had seed yield increases similar to that of the F1 hybrid (approximately 50–70% greater than the average of the parents). Increased seed yield of the Hybrid Mimics was accompanied by changes of plant architecture with increased plant height and increased inflorescence branch number relative to the parents. Three of the Hybrid Mimic lines derived from the Ws/Ler system had 20% increase in seed yield relative to the F1 hybrid. Genes which repress flowering were up-regulated and the expression levels of flowering -promoting genes including FLOWERING LOCUS T (FT), SUPPRESSOR OF OVEREXPRESSION OF CO 1 (SOC1) and FRUITFULL (FUL) were negatively correlated with the increase in seed yield in both hybrids and F7 Mimics of both systems.

中文翻译：

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拟南芥 Col/Ler 和 Ws/Ler 杂种和 Hybrid Mimics 通过增加高度、花序分枝和长角果数产生种子产量杂种优势

与亲本相比，杂种及其衍生模拟物的种子产量增加与株高和花序分枝数增加有关，这与 FT、SOC1 和 FUL 的表达减少相关。在拟南芥中，植物大小已被广泛研究，但很少有关于种子产量杂种优势的研究。在 Columbia (Col) 和 Landsberg erecta (Ler) 以及 Wassilewskija (Ws) 和 Ler 的杂交种中，存在显着的种子产量杂种优势。F6/F7 Hybrid Mimics 来自两个系统的杂种，其种子产量增加与 F1 杂种相似（比亲本的平均值高约 50-70%）。杂交模拟物种子产量的增加伴随着植物结构的变化，植物高度增加，花序分枝数相对于亲本增加。来自 Ws/Ler 系统的三个 Hybrid Mimic 系的种子产量相对于 F1 杂种增加了 20%。抑制开花的基因上调，促进开花的基因包括 FLOWERING LOCUS T (FT)、SUPPRESSOR OF OVEREXPRESSION OF CO 1 (SOC1) 和 FRUITFULL (FUL) 的表达水平与种子产量的增加呈负相关。两种系统的混合动力车和 F7 模拟车。