Abstract
Ricinus communis L. is a flowering plant species from the Euphorbiaceae family; it contains about 300 genera and 7500 species and belongs to the monotypic genus Ricinus. This study aims to investigate morphological, genetic diversity, and chemical analysis of castor bean (Ricinus communis) growing in Riyadh Saudi Arabia. Using a modified Cetyl Trimethyl Ammonium Bromide (CTAB), total plant genomic DNA was extracted from young leaves of each genotype. Four random HAP primers (HAP1, HAP2, HAP3, and HAP4) were used for RAPD PCR analysis proximate analysis was done for chemical analysis. Primers produced 32 DNA fragments 4 were polymorphic bands and 28 were not polymorphic bands polymorphism between two plants in bands was revealed in phonomertic characters that were recorded in this study. Four random HAP primers (HAP1, HAP2, HAP3, and HAP4) were used for RAPD analysis of the two castor bean (Ricinus communis) populations to detect polymorphism. The study showed that the result of proximate analysis protein in seeds was 16% in sample A and 15% in sample B while the total ash was 2.7 in sample A and 2.3 in sample B and fat was 47 and 47.8 respectively in samples A and B, the study recommended that it needs further study of the two castor bean (Ricinus communis) using suitable samples from two populations and it must make DNA sequencing to clear variation between the two types.