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Published online by Cambridge University Press: 27 March 2009
Origins of the monogerm character are described and a programme to produce a wide range of monogerm fully fertile lines is discussed. Back crossing to multigerms and hybridization among accessions of monogerm lines with relatively poor performance, together with selections from monogerm commercial varieties, provided sources from which improved lines were derived by recombination and selection. In the fifth year, experimental multiline varieties were synthesized which gave promising performance when evaluated in Institute trials at several locations in 2 years.