Diversification of FT-like genes in the PEBP family contributes to the variation of flowering traits in Sapindaceae species  

作　　者：Xing Huang Hongsen Liu Fengqi Wu Wanchun Wei Zaohai Zeng Jing Xu Chengjie Chen Yanwei Hao Rui Xia Yuanlong Liu 

机构地区：[1]State Key Laboratory for Conservation and Utilization of Subtropical Agro‑Bioresources,South China Agricultural University,Guangdong Guangzhou 510642,China [2]South China Agricultural University,Guangdong Laboratory for Lingnan Modern Agriculture,South China Agricultural University,Guangdong Guangzhou 510642,China [3]South China Agricultural University,Key Laboratory of Biology and Germplasm Enhancement of Horticultural Crops in South China,Ministry of Agriculture and Rural Affair,South China Agricultural University,Guangdong Guangzhou 510642,China [4]College of Plant Science and Technology,Huazhong Agricultural University,Hubei Wuhan 430070,China

出　　处：《Molecular Horticulture》2024年第1期253-267,共15页分子园艺(英文)

基　　金：supported by funding from Science and Technology Projects in Guangzhou(Grant No.2023A04J1455);the Key-Area Research and Development Program of Guangdong Province(#2022B0202070003);supported by the National Natural Science Foundation of China(#32072547,#32372665).

摘　　要：Many species of Sapindaceae,such as lychee,longan,and rambutan,provide nutritious and delicious fruit.Understanding the molecular genetic mechanisms that underlie the regulation of flowering is essential for securing flower and fruit productivity.Most endogenous and exogenous flowering cues are integrated into the florigen encoded by FLOWER-ING LOCUS T.However,the regulatory mechanisms of flowering remain poorly understood in Sapindaceae.Here,we identified 60 phosphatidylethanolamine-binding protein-coding genes from six Sapindaceae plants.Gene duplication events led to the emergence of two or more paralogs of the FT gene that have evolved antagonistic functions in Sapindaceae.Among them,the FT1-like genes are functionally conserved and promote flowering,while the FT2-like genes likely serve as repressors that delay flowering.Importantly,we show here that the natural variation at nucleotide position-1437 of the lychee FT1 promoter determined the binding affinity of the SVP protein(LcSVP9),which was a negative regulator of flowering,resulting in the differential expression of LcFT1,which in turn affected flowering time in lychee.This finding provides a potential molecular marker for breeding lychee.Taken together,our results reveal some crucial aspects of FT gene family genetics that underlie the regulation of flowering in Sapindaceae.

关 键 词：SAPINDACEAE Lychee(Litchi chinensis) FLOWERING FT1-like Cis-regulatory element 

分 类 号：R73[医药卫生—肿瘤]