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Allantoin is a heterocyclic nitrogen compound derived from purine. Allantoin in rice grains likely to play some role in providing plant growth and stress resistance ability during seed germination and seedling stage and serves as a beneficial antioxidant (Wang et al., 2012). Allantoin acts as an agent participating in chemical interactions between plants other species including insects, phytonematodes, plants and microorganisms (Arlian et al., 1996; Barbosa et al., 1999; Grassi et al., 2005; Wang et al., 2010). It also play important role in assimilation, metabolism, transport and storage of nitrogen in plants (Todd et al., 2006). In plants, two major forms of organic nitrogen compounds that can be transported, (i) amides (such as L-asparagine and L-glutamine), and (ii) ureides (such as allantoin and allantoate). Temperate-region legumes, such as pea, are amide exporters, while legumes of tropical origin, such as soybean, kidney bean and peanut, export nitrogen in the form of ureides.
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