**1. Introduction**

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Soybean (Glycine max (L.) Merrill) is known as 'Golden bean' and miracle crop of 20th century. Soybean is a native of North China, Asia belongs to family fabaceae. It is a versa‐ tile and fascinating crop with innumerable possibilities of not only improving agriculture but also supporting industries. Soybean besides having high yielding potential (40-45 q/ha) also provides cholesterol free oil (20%) and high quality protein (40%). It is a rich source of lysine (6.4%) in addition to other essential amino acids, vitamins and minerals. Its oil is also used as a raw material in manufacturing antibiotics, paints, varnishes, adhe‐ sives and lubricants etc.

Like other economically important crops soybean is also suffering from many diseases viz, rust (*Phakopsora pachyrhizi* Syd.) and yellow mosaic (Mungbean Yellow Mosaic Virus) are the major disease under Indian conditions, which causes considerable reduction in yield up to 80 per cent under severe conditions [3]. Further, another major problem in soybean is pods shattering which also reduces yield and in some varieties 100 per cent yield losses have been observed. The extent of yield loss due to pod shattering may range from negligible to signifi‐ cance levels depending upon the time of harvesting, environmental condition and genetic endowment of the variety [11]. Hence screening for soybean genotypes for identifying resistance to above major problems with high yielding potential will help to increase the production to a greater extent.

© 2013 Khan et al.; licensee InTech. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. © 2013 Khan et al.; licensee InTech. This is a paper distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
