Title：
A 17-Mb chromosomal inversion downstream of aPpOFP1gene is responsible for flat fruit shape in peach
Authors：
Corresponding
Author：
Zhou Hui， Ma Ruijuan， Gao Lei， Zhang Jinyun， Zhang Aidi， Zhang Xiujun， Ren Fei， Zhang Weihan， Liao Liao， Yang Qiurui， Xu Shengli， Otieno Ogutu Collins， Zhao Jianbo， Yu Mingliang， Jiang Quan， Korban Schuyler S.， Han Yuepeng*
Pubyear：
2021
Title of
Journal：
Plant Biotechnology Journal
Paper
Code：
Volume：
19
Number：
1
Page：
192-205
Others：
Classification：
Source：
Abstract：
Flat peaches have become popular worldwide due to their novelty and convenience. The peach flat fruit trait is genetically controlled by a single gene at theSlocus, but its genetic basis remains unclear. Here, we report a 1.7-Mb chromosomal inversion downstream of a candidate gene encoding OVATE Family Protein, designatedPpOFP1, as the causal mutation for the peach flat fruit trait. Genotyping of 727 peach cultivars revealed an occurrence of this large inversion in flat peaches, but absent in round peaches. Ectopic overexpression ofPpOFP1resulted in oval-shaped leaves and shortened siliques inArabidopsis, suggesting its role in repressing cell elongation. Transcriptional activation ofPpOFP1by the chromosomal inversion may repress vertical elongation in flat-shaped fruits at early stages of development, resulting in the flat fruit shape. Moreover,PpOFP1can interact with fruit elongation activatorPpTRM17, suggesting a regulatory network controlling fruit shape in peach. Additionally, screening of peach wild relatives revealed an exclusive presence of the chromosomal inversion inP. ferganensis, supporting that this species is the ancestor of the domesticated peach. This study provides new insights into mechanisms underlying fruit shape evolution and molecular tools for genetic improvement of fruit shape trait in peach breeding programmes.
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