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Article|01 Aug 2021|OPEN
Morphological, phenological, and transcriptional analyses provide insight into the diverse flowering traits of a mutant of the relic woody plant Liriodendron chinense
Yu Sheng1, Zhaodong Hao1, Ye Peng2, Siqin Liu1, Lingfeng Hu1, Yongbao Shen3, Jisen Shi1 & Jinhui Chen1,
1Key Laboratory of Forest Genetics & Biotechnology of Ministry of Education, Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, China
2College of Biology and the Environment, Nanjing Forestry University, Nanjing, China
3Southern Tree Seed Inspection Center National Forestry Administration, Nanjing Forestry University, Nanjing, China

Horticulture Research 8,
Article number: 174 (2021)
doi: 10.1038/hortres.2021.174
Views: 233

Received: 20 Nov 2020
Revised: 12 Apr 2021
Accepted: 04 May 2021
Published online: 01 Aug 2021

Abstract

Flowering is crucial to plant reproduction and controlled by multiple factors. However, the mechanisms underlying the regulation of flowering in perennial plants are still largely unknown. Here, we first report a super long blooming 1 (slb1) mutant of the relict tree Liriodendron chinense possessing a prolonged blooming period of more than 5 months, in contrast to the 1 month blooming period in the wild type (WT). Phenotypic characterization showed that earlier maturation of lateral shoots was caused by accelerated axillary bud fate, leading to the phenotype of continuous flowering in slb1 mutants. The transcriptional activity of genes related to hormone signaling (auxin, cytokinin, and strigolactone), nutrient availability, and oxidative stress relief further indicated active outgrowth of lateral buds in slb1 mutants. Interestingly, we discovered a unique FT splicing variant with intron retention specific to slb1 mutants, representing a potential causal mutation in the slb1 mutants. Surprisingly, most slb1 inbred offspring flowered precociously with shorter juvenility (~4 months) than that (usually 8–10 years) required in WT plants, indicating heritable variation underlying continuous flowering in slb1 mutants. This study reports an example of a perennial tree mutant that flowers continuously, providing a rare resource for both breeding and genetic research.