Li Zixuan, Mao Chenyuan, Wu Xinyi, Zhou Haoqing, Zhao Kunkun, Jiang Jiafu, Chen Sumei, Fang Weimin, Guan Zhiyong, Zhang Jing, Liao Yuan, Wang Zhenxing, Chen Fadi, Wang Haibin
State Key Laboratory of Crop Genetics and Germplasm Enhancement, Key Laboratory of Landscaping, Ministry of Agriculture and Rural Affairs, Key Laboratory of Biology of Ornamental Plants in East China, National Forestry and Grassland Administration, College of Horticulture, Nanjing Agricultural University, Nanjing, China.
Front Plant Sci. 2023 Jan 26;14:1120820. doi: 10.3389/fpls.2023.1120820. eCollection 2023.
Hybridization is an important evolutionary mechanism ubiquitous to plants. Previous studies have shown that hybrid polyploidization of cultivated chrysanthemum, 'Zhongshanzigui', and exhibit spring-flowering traits. This study explores the function of the LpFTLs gene via the phenotype of A. thaliana after heterologous transformation of the LpFTLs gene, and analyzes the mechanism ofthe continuous flowering phenotype and heterosis of hybrid offspring. The results suggest that the flowering phenotype of hybrid offspring in spring may be related to the expression of the gene. Ectopic expression of in resulted in earlier flowering, indicating that the gene also affects the flowering time in Compound expression of in × intergeneric hybridization directly leads to serious heterosis in the hybrid offspring. Moreover, continuous flowering appears to be accompanied by hybrid weakness under the balance of vegetative and reproductive growth. Therefore, in future studies on chrysanthemum breeding, a suitable balance point must be established to ensure the target flowering time under normal growth.
杂交是植物中普遍存在的一种重要进化机制。先前的研究表明，栽培菊花‘中山紫桂’的杂交多倍体表现出春季开花的性状。本研究通过对拟南芥进行LpFTLs基因的异源转化后观察其表型，探究LpFTLs基因的功能，并分析杂种后代连续开花表型和杂种优势的机制。结果表明，杂种后代春季开花表型可能与该基因的表达有关。在拟南芥中异位表达该基因导致开花提前，表明该基因也影响拟南芥的开花时间。在×属间杂交中该基因的复合表达直接导致杂种后代出现严重的杂种优势。此外，在营养生长和生殖生长的平衡下，连续开花似乎伴随着杂种劣势。因此，在未来的菊花育种研究中，必须建立一个合适的平衡点，以确保在正常生长条件下达到目标开花时间。
