The vascular targeted citrus FLOWERING LOCUS T3 gene promotes non-inductive early flowering in transgenic Carrizo rootstocks and grafted juvenile scions

• Published in: Scientific reports Vol. 10; no. 1; p. 21404
• Main Authors: Soares, Juliana M., Weber, Kyle C., Qiu, Wenming, Stanton, Daniel, Mahmoud, Lamiaa M., Wu, Hao, Huyck, Patrick, Zale, Janice, Al Jasim, Kawther, Grosser, Jude W., Dutt, Manjul
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 08.12.2020; Nature Publishing Group; Nature Portfolio
• Subjects: 631/449/1659; 631/449/447; 631/449/711; Arabidopsis thaliana; Chimera - genetics; Chimera - physiology; Citroncirus webberi; Citrus - genetics; Citrus - physiology; Citrus clementina; Ectopic expression; FLOWERING LOCUS T gene; Flowers; Flowers - genetics; Flowers - physiology; Gene expression; Gene Expression Profiling - methods; Gene Expression Regulation, Plant; Genetic transformation; High-Throughput Nucleotide Sequencing; Humanities and Social Sciences; Jasmonic acid; Membrane Transport Proteins - genetics; multidisciplinary; Phloem; Phylogeny; Plant Proteins - genetics; Plant Roots - genetics; Plant Roots - physiology; Plants, Genetically Modified - genetics; Plants, Genetically Modified - physiology; Poncirus - genetics; Poncirus - physiology; Population studies; Promoter Regions, Genetic; Rootstocks; Science; Science (multidisciplinary); Scions; Sequence Analysis, RNA; Sucrose synthase; Transcription factors; Transgenic plants
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-020-78417-9

Shortening the juvenile stage in citrus and inducing early flowering has been the focus of several citrus genetic improvement programs. FLOWERING LOCUS T (FT) is a small phloem-translocated protein that regulates precocious flowering. In this study, two populations of transgenic Carrizo citrange rootstocks expressing either Citrus clementina FT1 or FT3 genes under the control of the Arabidopsis thaliana phloem specific SUCROSE SYNTHASE 2 ( AtSUC2 ) promoter were developed. The transgenic plants were morphologically similar to the non-transgenic controls (non-transgenic Carrizo citrange), however, only AtSUC2-CcFT3 was capable of inducing precocious flowers. The transgenic lines produced flowers 16 months after transformation and flower buds appeared 30–40 days on juvenile immature scions grafted onto transgenic rootstock. Gene expression analysis revealed that the expression of SUPPRESSOR OF OVEREXPRESSION OF CONSTANS 1 ( SOC1 ) and APETALA1 ( AP1 ) were enhanced in the transgenics. Transcriptome profiling of a selected transgenic line showed the induction of genes in different groups including: genes from the flowering induction pathway, APETALA2/ETHYLENE RESPONSE FACTOR ( AP2 / ERF ) family genes, and jasmonic acid (JA) pathway genes. Altogether, our results suggested that ectopic expression of CcFT3 in phloem tissues of Carrizo citrange triggered the expression of several genes to mediate early flowering.