Dual Role Of Gloosy15 In Regulating Flowering By Modulating Gibberellins And Floral Organ Gene Expression In Maize Juan Yang by Juan Yang, Guoqiang Xu, Mingyue Zhang, Weicong Xue, Jie Wu, Yilin Li, Guangshu Song, Baobao Wang, Yongming Liu, Xiaoyuan Chen, Dexin Kong, And Haiyang Wang 10.1111/NPH.70492 instant download after payment.

Flowering time is determined by two developmental transitions (vegetative phase changeand floral transition), and is a key determinant of maize adaptation and yield potential.Gloosy15 (Gl15) encodes an APETALA2 (AP2)-like transcription factor that negatively reguHaiyang Wanglates maize vegetative phase change. However, the underlying explicit molecular mechanismof Gl15 remains unclear.Email: [email protected],[email protected]
In this study, we report that Gl15 is a candidate quantitative trait locus (QTL) for vegetativephase change and a selective target during modern maize breeding, and demonstrate that theReceived: 26 March 2025Hap1 allele of Gl15 likely represents a favorable haplotype under selection for early flowering.Accepted: 30 July 2025
We show that Gl15 directly downregulates the expression of a gibberellin (GA) biosynthesisgene (DWARF1, D1), but upregulates the expression of a GA catabolism gene (ZmGA2ox3)New Phytologist (2025)in both the leaf and shoot apices, leading to reduced bioactive GA levels and delayed flowering. We also find that Gl15 directly inhibits the expression of the floral activator ZMM4 in thedoi: 10.1111/nph.70492shoot apex to delay floral transition.Key words: floral transition, gibberellin (GA)
Our findings suggest a dual role of Gl15 in regulating flowering by modulating gibberelliand floral organ gene expression in maize, and provide new genetic targets for improvipathway, Gl15, maize, vegetative phaseflowering time in maize cultivars.change.