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A genetic program for rapid initiation of axillary meristems at the onset of flowering

ABSTRACT: Axillary meristems arise across developmental stages and at different positions along the shoot. These meristems vary in their initiation, pausing, outgrowth dynamics and morphogenetic outcomes. We used tomato to identify a transient, florigen - stimulated regulatory module that promotes rapid initiation of two types of axillary meristem - vegetative and reproductive during floral transition. We found this regulatory module, which is activated in the primary shoot meristem at the onset of floral transition, grants flexibility to inflorescence complexity as well as post-flowering initiation of vegetative branches. Our analyses uncover a mechanism for meristem-specific behavior, extending florigen’s regulatory role in reprogramming the shoot to accommodate the demands of reproductive stage

ORGANISM(S): Solanum lycopersicum

PROVIDER: GSE330584 | GEO | 2026/05/24

REPOSITORIES: GEO

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Project description:Plants initially undergo a period of vegetative development, in which it produces leaves from shoot apical meristem (SAM) and roots from the root apical meristem. Later in development, the SAM undergoes a change in fate and enters reproductive development called as floral transition, producing flowers and seeds. Our understanding of the molecular and genetic mechanisms that underlie reproductive development in plants has increased tremendously in the past decade, essentially through the work on Arabidopsis. In this study, we have analyzed the spatial and temporal gene expression in various tissues/organs and developmental stages of rice using microarray technology to identify the genes differentially expressed during various stages of reproductive development. Experiment Overall Design: Various rice tissues/organs (seedling root, mature leaf and Y leaf) and stages of reproductive (panicle and seed) development were used for RNA extraction and hybridization on Affymetrix microarrays. Three biological replicates of each sample were used for microarray analysis. We sought to obtain developmental and temporal gene expression profiles at each stage to identify the differentially expressed genes. Different stages of panicle and seed development have been categorized according to panicle length and days after pollination, respectively, based on landmark developmental events as follows: up to 0.5 mm, shoot apical meristem and rachis meristem (SAM); 0-3 cm, floral transition and floral organ development (P1); 3-10 cm, meiotic stage (P2 and P3); 10-15 cm, young microspore stage (P4); 15-22 cm, vacuolated pollen stage (P5); 22-30 cm, mature pollen stage (P6); 0-2 dap, early globular embryo (S1); 3-4 dap, middle and late globular embryo (S2); 5-10 dap, embryo morphogenesis (S3); 11-20 dap, embryo maturation (S4); 21-29, dormancy and desiccation tolerance (S5). These stage specifications are approximations based on information from Itoh et al., 2005, Plant Cell Physiol, 46, 23-47.

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A genetic program for rapid initiation of axillary meristems at the onset of flowering

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