biostudies-literatureLiu JNational Natural Science Foundation of China341https://www.ebi.ac.uk/biostudies/studies/S-EPMC6286610biostudies-literatureUnknown18(1)<h4>Background</h4>Great advances have been achieved in our understanding of flower development and evolution since the establishment of the ABC model. However, it remains a challenge to define the exact context of organ identity in the component interactions of the ABC model.<h4>Results</h4>Through hybridization, we detected a homeotic mutant in Petrocosmea (Gesneriaceae) uniquely displayed by the 'petaloid-stamen' in the third whorl with petal identity. Comparative Real-time PCR analyses demonstrate that both two B-class genes DEF2 and GLO are excessively expressed while the transcripts of the C-class gene PLE are reduced in the third floral whorl in the mutant compared to that in the wild-type F₁ hybrids. Further allele-specific expression (ASE) analyses indicate that an alleBMC plant biologyDosage imbalance of B- and C-class genes causes petaloid-stamen relating to F₁ hybrid variation.PMC6286610nos. 31170198nos.31530003Yang XLiu JDong YLi CQWang YZfalseDosage imbalance of B- and C-class genes causes petaloid-stamen relating to F₁ hybrid variation.<h4>Background</h4>Great advances have been achieved in our understanding of flower development and evolution since the establishment of the ABC model. However, it remains a challenge to define the exact context of organ identity in the component interactions of the ABC model.<h4>Results</h4>Through hybridization, we detected a homeotic mutant in Petrocosmea (Gesneriaceae) uniquely displayed by the 'petaloid-stamen' in the third whorl with petal identity. Comparative Real-time PCR analyses demonstrate that both two B-class genes DEF2 and GLO are excessively expressed while the transcripts of the C-class gene PLE are reduced in the third floral whorl in the mutant compared to that in the wild-type F₁ hybrids. Further allele-specific expression (ASE) analyses indicate that an alle2018-01-01T00:00:00Z2018 Dec2026-05-06T01:53:49.171Z2019-03-27T00:12:21ZS-EPMC62866103052648710.1186/s12870-018-1562-4