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Six ethyl methanesulfonate-induced chlorophyll-deficient mutants of Melilotus alba Desr. were studied. Each of the mutants behaved as a monogenic recessive. Complementation analysis revealed that the genes from five of the mutants were nonallelic to each other and to the previously reported mutants ch4, ch5, ch6, and ch7. Proposed symbols for the five genes are ch8, ch9, ch10, ch11, and ch12. No linkage was detected between ch5 and ch7, ch7, and Mf, (multifoliolate leaf), ch8 and ch4, ch8 and ch5, ch8 and ch6, and ch8 and ch7.