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

The castor bean crop in Sao 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.