Abstract
AbstractSix nutrient formulations were studied for their efficacy in inducing mitosis in white lupin seedling cotyledon protoplasts of which the formulations of Schäfer‐Menuhr & Stürmer (AS) and Kao (K8p) were found to be superior over the other four when supplemented with 6‐benzylaminopurine and α‐naphthaleneacetic acid (α‐NAA). An ultrafiltration treatment of K8p increased mitotic frequency by 130% when compared with the untreated control. Medium enrichment with 0.2% bovine serum albumin (BSA) brought about a dramatic 1341% rise in protoplast division in comparison with BSA‐free medium but only when the enrichment was carried out in Kao and Michayluk (KM8p) background containing 2,4‐dichlorophenoxyacetic acid, α‐NAA and zeatin. A higher number of protocolonies (each proliferating from single protoplast following multiple divisions) were seen in 0.4% BSA. With this breakthrough in white lupin protoplast research, it is now possible to reproducibly obtain protocolonies that was hitherto not possible.
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