Some species of the Physalis family of Solanaceae are homologous in fruit and food, and their reproductive organs (including flower organs, berries and seeds) vary in size and can be divided into three groups: large, medium and small. . The molecular genetic regulation of this natural variation in organ size is unclear.


A recent study by the Chinese Academy of Sciences Institute of Botany, He Chaoying, found that the Physalis Organ Size 1 (POS1) gene plays an important role in the natural variation of the reproductive organs of a Phytophthora (P. philadelphica). POS1 encodes an AP2 class transcription factor with a 37 bp regulatory sequence in its first intron. This sequence copy number is 1, 2, and 3 tandem repeats in the large, medium, and small groups, respectively. The variation of the copy number of the regulatory sequence was significantly negatively correlated with the expression level of POS1 gene in the reproductive organs, and the expression level of the gene was significantly positively correlated with the organ size.


The study revealed that the intrinsic regulatory region mutations lead to the important role of regulatory gene self-expression changes in the natural variation of organ size, and found a new gene and new mechanism different from the tomato domestication genetic regulation, for understanding the organ morphological diversity The evolutionary mechanism is of great significance. The POS1 gene and its regulation mechanism have important application prospects in the cultivation of high-yield new varieties of Physalis.


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