Plant height is an important agronomic trait in crops. Several genes underlying tomato (Solanum lycopersicum) plant height mutants have been cloned. However, few quantitative trait genes for plant height have been identified in tomato. In this study, seven quantitative trait loci (QTLs) controlling plant height were identified in tomato. Of which, qtph1.1 (QTL for tomato plant height 1.1), qtph3.1 and qtph12.1 were major QTLs and explained 15, 16, and 12% of phenotypic variation (R²), respectively. The qtph1.1 was further mapped to an 18.9-kb interval on chromosome 1. Based on the annotated tomato genome (version SL2.50, annotation ITAG2.40), Solyc01g098390 encoding GA receptor SlGID1a was the putative candidate gene. The SlGID1a gene underlying the qtph1.1 locus contained a single nucleotide polymorphism (SNP) that resulted in an amino acid alteration in protein sequence. The near-isogenic line containing the qtph1.1 locus (NIL-qtph1.1) exhibited shorter internode length and cell length than the wild type (NIL-WT). The dwarf phenotype of NIL-qtph1.1 could not be rescued by exogenous GA₃ treatment. Transcriptome analysis and real-time quantitative reverse transcription PCR (qPCR) showed that several genes related to biosynthesis and signaling of GA and auxin were differentially expressed in stems between NIL-qtph1.1 and NIL-WT. These findings might pave the road for understanding the molecular regulation mechanism of tomato plant height.

株高是农作物的重要农艺性状。番茄的几个基因番茄）植物高度突变体已被克隆。然而，在番茄中几乎没有鉴定出植物高度的数量性状基因。在这项研究中，确定了控制番茄高度的七个数量性状基因座（QTL）。其中，qtph1.1 （番茄植株高度1.1的QTL）， qtph3.1 和 qtph12.1是主要的QTL，分别解释了表型变异（R ²）的15％，16％和12％。的qtph1.1 被进一步映射到1号染色体上的18.9kb区间。基于带注释的番茄基因组（版本SL2.50，注释ITAG2.40）， Solyc01g098390编码GA受体S1GID1a的编码是推定的候选基因。的糖蛋白1a 潜在的基因 qtph1.1位点包含一个单核苷酸多态性（SNP），可导致蛋白质序列中的氨基酸改变。包含qtph1.1 轨迹（NIL-qtph1.1）表现出比野生型（NIL-WT）短的节间长度和细胞长度。NIL-的矮型qtph1.1外源GA ₃不能挽救。转录组分析和实时定量逆转录PCR（qPCR）显示，与NIL-之间茎中的GA和生长素的生物合成和信号传导相关的几个基因差异表达。qtph1.1和NIL-WT。这些发现可能为理解番茄高株的分子调控机制铺平了道路。