Morphological, phenological, and transcriptional analyses provide in sight into the diverse flowering traits of a mutant of the relic woody plant Liriodendron chinense  

作　　者：Yu Sheng Zhaodong Hao Ye Peng Siqin Liu Lingfeng Hu Yongbao Shen Jisen Shi Jinhui Chen 

机构地区：[1]Key Laboratory of Forest Genetics&Biotechnology of Ministry of Education,Co-Innovation Center for Sustainable Forestry in Southern China,Nanjing Forestry University,Nanjing,China [2]College of Biology and the Environment,Nanjing Forestry University,Nanjing,China [3]Southern Tree Seed Inspection Center National Forestry Administration,Nanjing Forestry University,Nanjing,China

出　　处：《Horticulture Research》2021年第1期2345-2360,共16页园艺研究（英文）

基　　金：This work was funded by the Natural Science Foundation of China(32071784,31770715);the Key Research and Development Plan of Jiangsu Province(BE2017376);the Qinglan Project of Jiangsu Province,the Distinguished Professor Project of Jiangsu and the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).

摘　　要：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(slbl)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 slbl 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 slbl mutants.Interestingly,we discovered a unique FT splicing variant with intron retention specific to slbl mutants,representing a potential causal mutation in the slbl mutants.Surprisingly,most slbl 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 slbl mutants.This study reports an example of a perennial tree mutant that flowers continuously,providing a rare resource for both breeding and genetic research.

关 键 词：TRAITS MORPHOLOGICAL FLOWERS 

分 类 号：Q94[生物学—植物学]