Bioscience Evidence 2024, Vol.14, No.5, 218-226 http://bioscipublisher.com/index.php/be 221 regulatory network governing ovule development (Osnato et al., 2020). The integrated molecular network for ovule number regulation also highlights the role of various transcription factors, enzymes, and micro-RNAs, which could interact with OsHIPP16 to influence ovule development (Qadir et al., 2021). 4.3 Phytohormonal influence onOsHIPP16 activity Phytohormones play a central role in the regulation of ovule development, and their influence on OsHIPP16 activity is likely significant. Auxins (AUX), Brassinosteroids (BR), and Cytokinins (CK) are positive regulators of ovule number, while Gibberellins (GA) act negatively (Figure 2) (Qadir et al., 2021; Barro-Trastoy et al., 2022). These hormones could modulate the expression and activity of OsHIPP16, thereby affecting ovule development. The complex interplay between these phytohormones and OsHIPP16 could be a key area of research to understand the precise molecular mechanisms underlying ovule development in rice. 5 Experimental Evidence SupportingOsHIPP16 Function 5.1 Phenotypic analysis of OsHIPP16 mutants Phenotypic analysis of OsHIPP16 mutants provides critical insights into the gene's role in ovule development. In rice, the D-lineage MADS-box gene OsMADS13, which is orthologous to OsHIPP16, has been shown to control ovule identity. Mutants of OsMADS13 exhibit female sterility and transformation of ovules into carpelloid structures, indicating a loss of ovule identity (Dreni et al., 2007). This phenotypic evidence suggests that OsHIPP16, like OsMADS13, may play a crucial role in maintaining ovule identity and proper development. Figure 2 An integrated gene network for the regulation of ovule number (Adopted from Qadir et al., 2021) Image caption: Four types of phytohormones (AUX, BRs, CKs and GAs) and other regulators are shown in blue and black color, respectively. The black and red arrows show the relationship between the up-/down-stream genes and between genes and phenotype, respectively. Functional characterization of “ovule number controlling genes” shows that a significant number play a role in biosynthesis and signaling pathways of several types of phytohormones, mainly as auxins (AUX), cytokinins (CK), brassinosteroids (BR), and gibberellins (GA) (Adopted from Qadir et al., 2021)
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