Abstract：Taking cultivated variety ‘Yujiang No.1’as the contrast of wild type（WT），this study
conducted identification and evaluation on phenotypic characteristics，cytology，resistance and quality，
etc. relative indexes of yield increasing Zhugen ginger height mutant line（HM15）．The results showed that
comparing with WT，the plant height，weights of fresh root，leaf，stem and tuber were all significantly
or extremely significantly increased．While，there were no distinct deferences in emergence rate，maturity
period，stem thickness and branching numbers．Cytological observation from seedling stage to harvest time
by transverse and longitudinal sections of reciprocal No.3 internode having the largest increasing indicated
that the plant height of HM15 was determined by internode length，and having nothing to do with internode
number．The expand of stem cell volume was the reason for internode elongating．The contents of 3 stimulating
growth hormones，including brassinosteroid （BR），auxin（IAA） and gibberellin（GA3） in HM15 stems were
signifi cantly higher or extremely signifi cantly higher than that of WT，while the content of growth inhibiting hormone
abscisic acid（ABA）was signifi cantly lower than that of WT．The activities of defense enzymes peroxidase（POD），
superoxide dismutase（ SOD） and contents of total biomass（TP）and lignin i n HM15 leaves were significantly
higher or extremely signifi cantly higher than those of WT under strong light stress．During harvest time，the contents
of critical function 6-Gingerol in tuber was signifi cantly higher than that of WT and crude fi ber in HM15 tuber was
signifi cantly lower than that of WT．So HM15 can be used as an excellent breeding material．The results of this study
have laid a foundation for gene location，map-based cloning，function analysis and breeding utilization．
