Flowering Phenology and Reproductive Characteristics of Platycodon grandiflorum

White and purple Platycodon grandiflorum populations were taken as test objects to study their phenology and reproductive characteristics.Single flowers' floral dynamics,flowering phenology indexes and fruit setting rate of the two populations were analyzed,and the effects of flowering phenology indexes on the reproductive success of P.grandiflorum were studied.The flowering span of P.grandiflorum was from early July to mid and late September,and the flowering phase of the population,individual,and single flower lasted approximately 35 ~ 47,26 ~ 31,and 5 ~ 7 days,respectively.The flowering amplitude curves of the populations at individual level were of single peak and higher synchrony,taking on amass-floweringpattern.Correlation analysis showed that white flower P.grandiflorum fruit setting number had significantly positive correlation with flourishing flowering date and bud number and purple flower P.grandiflorum fruit setting number had significantly positive correlation with bud number.Variation coefficient analysis of flowering phenology indicated that there existed significant differences in the total flower number,flowering amplitude,peak flowering date,last flowering date and fruit setting,but less difference in synchrony index,first flowering date,flowering duration and fruit setting number among the two populations.