(Ultrastructural analysis of in vitro direct and indirect organogenesis). This is a comparative study of the ultrastructural characteristics of the cells involved in the organogenesis in vitro of Bauhinia forficata Link (indirect system) and Glycine max (L.) Merrill (direct system). B. forficata calli after 30 days culture and G. max meristemoids after 10 days culture were prepared for ultrastr...

The discovery of tissue stem cells has launched the current boom in the field of regenerative research, which is tremendously exciting and holds enormous therapeutic potential. Despite such optimism, recent findings have tempered the potential for medical practice. Anatomically complicated organs, such as the kidney, have proved refractory to stem cell-based regenerative techniques. As the kidn...

lilium ledebourii (baker) boiss. (liliaceae) is a critically endangered lily species native tonorthern iran, where it is protected by law. in order to develop a cost effective method for largescalepropagation, the effects of three culture systems (solid, liquid and temporary immersion)and two types of cytokinins [6-benzyladenine (ba) and thidiazuron (tdz)] were studied onthe in vitro plant rege...

1. Isolated blood cells, when placed for incubation in a plasma substratum, are capable of constructing highly organized, tubular processes that project from the explanted cell mass into the surrounding medium. 2. The tubular structures have fibrillar walls that may be covered, eventually, by a membranous layer of leukocytes. Their lumina contain blood cells suspended in fluid. 3. The formation...

Abstract Corydalis saxicola Bunting, a medicinal herb known for alkaloids, grows mainly in Guizhou province and northwest Guangxi of China. In this study, the first time plant, an efficient adventitious shoot proliferation regeneration system via organogenesis from leaf petiole explants was established. Cytokinins, including 6-benzyladenine (BA) thidiazuron (TDZ), induced callus then organogene...

The world's most expensive wood, sandalwood (Santalum album L.), requires a stringent mass-propagation technique to prevent future scarcity. Plant tissue culture is an efficient method that regenerates the whole plant from single cell on hormone-based growth medium. To efficiently regulate formation of plants, it important understand developmental organogenesis pathways (i.e., direct and indire...

In many animals, germ cells migrate to the gonad to assemble into a functional organ. Recent work in Drosophila has built a picture of the gene activities that specify the gonad and allow it to attract germ cells, and has led to the identification of a gene, columbus, that may encode the attractive factor.