Pigeonpea [Cajanus cajan (L.) Millspaugh] is an important legume crop of the papilionaceae family. It is an often cross-pollinated crop, and breeding principles of both self and cross-pollinated crops are highly effective in its genetic enhancement. Pigeonpea is a hard woody shrub, extensively adaptable to a range of soil types, temperature, and rainfall. It has a deep taproot system extending up to two meters and can grow to a height of four meters. Pigeonpea roots form a symbiotic association with Brady rhizobium spp. and perform biological nitrogen fixation. The branching pattern of stem may vary from bush type to compact upright type and is of determinate, semi-determinate, and non-determinate type based on the flowering pattern. The primary leaves are simple, opposite, and caduceus, while the latter ones are pinnately trifoliate with lanceolate to elliptical leaflets. Pigeonpea flowers are zygomorphic, borne on terminal or auxiliary racemes and are normally yellow in color with some variations. It has ten stamens in diadelphous condition with light or dark yellow anthers. The ovary is superior with a long style attached to a thickened, incurved, and swollen stigma. Pigeonpea is an often cross-pollinated crop with an average of 20% cross-pollination. The fruit of pigeonpea is called pod, which is of various colors, with and without deep constrictions. Seeds (with 20-22% proteins and amino acids) can be round or lens shaped, in shades of white and brown color with yellow color cotyledon. Pigeonpea is a widely consumed multi-utility pulse crop, thus the knowledge about the crop botany is vital for modifying it according to future challenges and goals.

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Chitosan is a natural linear amino polysaccharide produced from the deacetylation of chitin obtained from crustaceans and insects. Chitosan structure consists of 2-acetamido-d-glucose and 2-amino-d-glucose units linked with glycosidic linkages. It is a versatile compound due to presence of reactive amino and hydroxyl groups making it easily available for chemical reactions. Various functional chitosan derivatives have been prepared using ionic interactions and other chemical modifications. Chitosan is known to exhibit excellent properties such as biodegradability, biocompatibility, non-toxicity and easy absorption which led to significant research towards industrial, pharmaceutical and biomedical applications. This review discusses the importance and characteristics of chitosan and its derivatives by describing various aspects including biological properties, chemical properties, techniques of preparation and its applications.