Effect of chemical gametocides on pollen sterility and seed set in rice (Oryza sativa L.)

Of the three chemical gametocides tested on four genotypes of rice, ethrel and sodium methyl arsenate were found to induce maximum pollen sterility in all the genotypes. Phytotoxic effects were also produced by ethrel to a certain extent in all the genotypes, especially in IR-57311-95-2-3, like reduced panicle length and spikelet size. The genotypes IR-72 and Swarna recorded minimum seed set under selfing.