The model basal eudicot plant California poppy (Eschscholzia californica Cham.) typically has intense yellow to orange petals and orange pollen due to pigmentation by carotenoids. Flower color variants ranging from white to yellow and orange are common. We analyzed flower color inheritance in a diverse range of white and yellow color variants with reduced carotenoid content. The inheritance of ...

To identify genes involved in Arabidopsis thaliana petal and stamen organogenesis, we used a gene trap approach to examine the patterns of reporter expression at each stage of flower development of 1765 gene trap lines. In 80 lines, the reporter gene showed petal- and/or stamen-specific expression or lack of expression, or expression in distinct patterns within the petals and/or the stamens, in...

Choosing a favourite image is very difficult to do, not least because different images are important to us for different reasons. I have decided to focus here on an image that is not only intrinsically beautiful, but that also emphasizes the importance of looking and seeing properly when trying to understand the world around us. For me, this image, the adaxial surface of the petal of Veronica c...

A recent study of the expression of floral organ identity genes in buttercups, poppies and their relatives has shed light on the evolutionary origin of petals.

Neutral sugar, free amino acid, and anthocyanin levels and vacuole/extravacuole distribution were determined for Hippeastrum and Tulipa petal and Tulipa leaf protoplasts. Glucose and fructose, the predominant neutral monosaccharides observed, were primarily vacuolar in location. Glutamine, the predominant free amino acid found, was primarily extravacuolar. gamma-Methyleneglutamate was identifie...

This paper discusses about advanced disk storage necessary for distributed systems. It briefly discusses the disk storage research and the various storage systems developed. Among them the Petal, distributed virtual disks developed at the systems research center, Digital Equipment Corporation and PersonalRaid, mobile storage for distributed and disconnected computers developed at Princeton Univ...

A petal graph is a connected graph G with maximum degree three, minimum degree two, and such that the set of vertices of degree three induces a 2–regular graph and the set of vertices of degree two induces an empty graph. We prove here that, with the single exception of the graph obtained from the Petersen graph by deleting one vertex, all petal graphs are Class 1. This settles a particular cas...