Sexual systems are highly variable in flowering plants and an important contributor to floral diversity. The ranunculid genus Thalictrum is especially well-suited to study evolutionary transitions in sexual systems. Homeotic transformation of sexual organs (stamens and carpels) is a plausible mechanism for the transition from hermaphroditic to unisexual flowers in this lineage because flowers o...

Growth of tissues is highly reproducible; yet, growth of individual cells in a tissue is highly variable, and neighboring cells can grow at different rates. We analyzed the growth of epidermal cell lineages in the Arabidopsis (Arabidopsis thaliana) sepal to determine how the growth curves of individual cell lineages relate to one another in a developing tissue. To identify underlying growth tre...

UN CO RR EC Perimembranous ventricular septal defect in adulthood can be complicated by episodes of sustained ventricular tachycardia [1,2]. The treatment algorithm of both the arrhythmia and congenital cardiac defect can raise some issues, namely medical versus interventional therapies. We report the case of a 40 years old man, admitted for slow ventricular tachycardia with left bundle branch ...

Multicellular development produces patterns of specialized cell types. Yet, it is often unclear how individual cells within a field of identical cells initiate the patterning process. Using live imaging, quantitative image analyses and modeling, we show that during Arabidopsis thaliana sepal development, fluctuations in the concentration of the transcription factor ATML1 pattern a field of iden...

The involvement of PISTILLATA (PI) and APETALA (AP) transcription factors in the development of floral organs has previously been elucidated but little is known about their upstream regulation. In this investigation, two novel mutants generated in Papaver somniferum were analyzed--one with partially petaloid sepals and another having sepaloid petals. Progeny from reciprocal crosses of respectiv...

One of the most dynamic research and application areas of neural networks is classification. In this paper, the use of matlab coding for simulation of backpropagation neural network for classification of Iris dataset is demonstrated. Fisher’s Iris data base collected from uci repository is used. The data set contains 3 classes of 50 instances each, where each class refers to a type of iris plan...

Abstract Geodorum densiflorum is an ornamental and medicinally important orchid. The medicinal metabolites are produced by endophytic fungi associated with orchid tissue, particularly flowers. However, there no report of the from G. This research aimed to study different parts flower. Fungal isolation was carried out sepal, petal, labium, stigma, anther using surface sterilization method. were ...

Plant organs reproducibly reach a set size and shape, and a key question is what prevents overgrowth. A new study uses imaging and computer modelling of the Arabidopsis sepal to show that mechanics determines growth arrest and thus final organ shape.

Subgeneric groups have been circumscribed in Iris based on a small number of morphological characters. Recent DNA sequence data has indicated that several of the subgenera, sections, and series that have previously been delineated are paraphyletic or polyphyletic. The evolution of characters that have traditionally been used to distinguish sub generic and sectional groups within Iris was invest...