The process of development involves mechanisms at the molecular, cellular and tissue levels to arrive at the complex anatomical and physiological structure of an organism. The study of development can shed light into the processes of many diseases and disorders that afflict people worldwide.

Arabidopsis thaliana

-is a small flowering plant related to the mustard plant.  Scientists have sequenced its entire genome and it has become the model for studying plant biology.

 —> Each leaf contains thousands of pores, stomata, which allow gas exchange between the atmosphere and the shoot. The first photograph was taken using cryoscanning electron microscopy. The second photograph was taken using confocal laser scanning microscopy. The red channel shows the cell outlines (cell walls labeled with propidium iodide), and the green channel shows where a particular gene is expressed. [UBC Botanical Garden and Centre for Plant Research]

A recent study in Science focuses on light signaling and gene expression in Arabidopsis:

Scientists shed light on braking mechanisms in cellular signaling

A team of researchers studying a flowering plant has zeroed in on the way cells manage external signals about prevailing conditions, a capability that is essential for cells to survive in a fluctuating environment.

Read more at: http://phys.org/news/2014-06-scientists-mechanisms-cellular.html#jCp