Shattering and Shedding Resistance
Nonshattering and nonshedding are characteristic features of many crops which have been selected very early soon after the wild-growing ancestors had been transferred into the status of cultivated plants. Nevertheless, plenty of seeds get lost in cereals and in some oil plants during ripening or harvesting because of fruit shattering or shedding. Genes causing resistance to this damage may therefore be of direct agronomic interest. So far, only little information is available in this field. Nonshattering mutants have been selected in soybeans (Nalampang 1975; Rubaihayo 1976a, b), Brassica juncea (Nayar and George 1969), and rice (Majumder 1969). Mutants of Sesamum indicum, selected in Japan, have indehiscent capsules. This positive effect, however, cannot be utilized agronomically because of some negative features caused by the pleiotropic gene (Kobayashi 1965). The increased yield of a Russian alkaloidless mutant of Lupinus luteus is partly due to its shedding resistance (Jashovsky and Golovchenko 1967). A mutant of this type is also known in rice, but it shows a reduced fertility.