Transitions in development – an interview with Marie Monniaux

Marie Monniaux is a permanent CNRS researcher in the ‘Evo-devo of the flower’ group at the Laboratory for Plant Reproduction and Development (RDP) at the École normale supérieure (ENS) in Lyon, France. Marie uses Petunia to understand the development and evolution of the flower petal. We met Marie over Teams for a virtual chat about her career path, finding a permanent position and her ideas for the future.

EDGE ODD GRACEFUL LABELING OF SOME FLOWER PETAL GRAPHS

A labeling of a graph $G$ with $\alpha$ vertices and $\beta$ edges called an edge odd graceful labeling if there is an edge labeling with odd numbers to all edges such that each vertex is assigned a label which is the sum $\mod (2\gamma)$ of labels of edge incident on it, where $\gamma=max\{\alpha,\beta\}$ and the induced vertex labels are distinct. In this paper, we discussed about edge odd gracefulness of some special class of flower petal graphs.

Application of Modified Flower Petal in Side Branch of Acute Myocardial Infarction Patient: REVERSE Modified Flower Petal

Introduction: Concerning the poor clinical outcomes in cases of acute myocardial infarction (AMI) with bifurcation lesions undergoing primary percutaneous coronary intervention (PCI), we described a successful application of modified flower petal technique and called it the REVERSE modified flower petal technique in a patient with AMI. Case Presentation: A 56-years-old man who suffered from chest pain was admitted to the emergency ward. After clinical examination, the primary diagnosis was acute anterolateral MI. Therefore, PCI on left anterior dimension (LAD) and diagonal arteries using modified flower petal stenting was performed in the side branch, which we called it REVERSE modified flower petal. Conclusions: Modified flower petal stenting was performed by the REVERSE mechanism as described in the report of the new intervention (2.5 × 18). The follow-up after 24 months by the exercise stress test using the Bruce protocol supported the success of the intervention.

Petal Color-Transition in Lonicera japonica is Mainly Associated with Increase of the Carotenoid Content and Carotenoid Biosynthetic Gene Expression

Background: Plants have remarkable diversity in petal color through the biosynthesis and accumulation of various pigments. To better understand the mechanisms regulating the petal pigmentation, we used multiple approaches to investigate the changes of carotenoids, gene expression dynamics and endogenous hormones in Lonicera japonica during petal color transitions, i.e. green bud petal (GB_Pe), white flower petal (WF_Pe) and yellow flower petal (YF_Pe). Results: Metabolome analysis showed that YF_Pe had a much higher content of carotenoids than white petals, with violaxanthin identified as the major carotenoid compound in YF_Pe. Comparative transcriptome analysis revealed that the key differentially expressed genes (DEGs) involved in carotenoid biosynthesis, such as phytoene synthase, phytoene desaturase and ζ-carotene desaturase, were significantly up-regulated in YF_Pe. However, expression levels of the carotenoid degradation-related genes, including abscisic-aldehyde oxidase 3 and carotenoid cleavage dioxygenase 4, were significantly down-regulated in YF_Pe. The results indicated that upregulated carotenoids concentrations and carotenoids biosynthesis-related genes promote the color transition. Furthermore, enrichment analysis of DEGs was mainly associated with the metabolic pathways of hormone signal transduction during petal color transitions. The DEGs were mainly involved in the auxin, cytokinin, gibberellin (GA), brassinosteroid (BR), jasmonic acid and abscisic acid (ABA) signal pathways. Accordingly, analyses of changes in indoleacetic acid, zeatin riboside, GA, BR, methyl jasmonate and ABA levels indicated that the color transitions are regulated by endogenous hormones. Conclusion: Our results provide new insight into the regulatory mechanisms underlying the petal color transitions during flower development process in L. japonica.