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No Estado de São Paulo cultiva-se quase que exclusivamente o cultivar de mamoeira 'IAC-38', que possui porte pequeno, grande vigor, chegando a dar 2000 kg de sementes por hectare e 41% de óleo. Tem, porém, o inconveniente de apresentar frutos deiscentes, resultando na necessidade de várias colheitas por ano, o que encarece o produto. Em 1957 realizaram-se hibridações visando transferir o caráter indeiscência do cultivar 'Cimarron' para o 'IAC-38'. Das numerosas progênies estudadas até F5, duas se destacaram e deram origem a promissoras linhagens de frutos indeiscentes. Após a análise destas duas seleções em ensaios comparativos de produção, aproveitou-se a melhor delas para multiplicação. Essa linhagem constituiu o cultivar 'Campinas'. Além de ter produção comparável à do 'IAC-38' e de apresentar frutos in-deiscentes, tem ainda a vantagem do porte médio e de possuir o teor de 46% de óleo nas sementes. The castor bean crop in São Paulo has been expanding in recent years and reached about 30,000 tona of seed annually. The IAC-38 cultivar is the most planted It has a dwarf size, a cycle of 180 to 200 days, and yields about 2,000 tons of seed per hectare. Its seed oil content is 41%. It is an outstanding cultivar, but has the disadvantage of having dehiscent fruit. This requires a great number of harvests and consequently increases the labor costs. Hybrids between IAC-38 and the non-shattering cultivar Cimarron were made in 1957. After five generations of successive selfings and individual selection testings, a progeny was found that associates good vegetative characters with high yield and indehiscent capsules. Plants representative of this new selected cultivar have medium height, erect branches, and a cycle of 140 to 150 days. They show a partial defoliation at hervest time. The yield is comparable to that of the IAC-38 and its seed oil content is better (46%). The new cultivar that has been named Campinas will probably be released to farmers in the next two years

Melhoramento da mamoneira transferência do caráter indeiscência para o cultivar 'IAC-38' de mamoneira