| Autor: |
Yu, Ting, Ai, Guo, Xie, Qingmin, Wang, Wenqian, Song, Jianwen, Wang, Jiaying, Tao, Jingbao, Zhang, Xingyu, Hong, Zonglie, Lu, Yongen, Ye, Jie, Zhang, Yuyang, Zhang, Junhong, Ye, Zhibiao |
| Zdroj: |
Horticulture Research; January 2022, Vol. 9 Issue: 1 |
| Abstrakt: |
Fruit shape is an important biological trait that is also of special commercial value in tomato. The SUNgene has been known as a key regulator of tomato fruit elongation for years, but the molecular mechanisms underlying its transcriptional regulation remain little understood. Here, a unique BZR1-like transcription factor, BZR1.7, was identified as a trans-acting factor of the SUNgene promoter that bound to the conserved E-box of the promoter to promote SUNgene expression. Overexpression of BZR1.7in tomato led to elevated SUNgene expression and formation of elongated fruits. Plants of the BZR1.7knockout mutant created by gene editing did not exhibit an observable fruit shape phenotype, suggesting possible functional redundancy of BZR1-like genes in tomato. There were seven BZR1-like genes in the tomato genome and overexpression of BZR1.5and BZR1.6led to elongated fruit phenotypes similar to those observed in the BZR1.7overexpression lines, further supporting the notion of functional redundancy of BZR1-like genes in tomato fruit shape specification. Microscopic analysis revealed that there was a decreased number of cell layers in the fruit pericarp in the BZR1.7overexpression lines. These findings offer new insights into the regulatory mechanism by which BZR1.7 promotes SUNgene expression and regulates fruit elongation in tomato. |
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