GIBBERELLINS IN IMMATURE SEEDS OF CANAVALIA .I. ISOLATION AND BIOLOGICAL ACTIVITY OF GIBBERELLINS A21 AND A22

Two novel gibberellins, GA21 (I) and GA22 (II), were isolated from immature seeds of sword bean, Canavalia gladiata DC. The isolation procedure of these substances as well as their growth-promoting effects on dwarf maize mutants d1 and d5, rice, cucumber and dwarf peas (Progress No. 9) are described. The structures of two new gibberellins, GA21 and GA22, isolated from immature seeds of sword bean, were determined as 4aα, 7α-dihydroxy-8-methylenegibbane-1, 1, 10β-tricarboxylic acid 1→4a lactone (II) and 4aα, 7α-dihydroxy-l β-hydroxymethyl-8-methylenegibb-2-ene-1α, 10β-dicaboxylic acid 1→4a lactone (IV), respectively, on the basis of chemical and physicochemical studies. © 1961 Taylor & Francis Group, LLC.