Flowering dynamics and breeding system of Holcoglossum omeiense,a wild plant with extremely small populations
Holcoglossum omeiense was endemic to China,with extremely small population.In order to ex-plore its flowering characteristics and breeding system,the flower phenology,floral syndrome and flower-ing process were investigated.Meanwhile,pollen viability and stigma receptivity determination,hybridiza-tion index estimation,and artificial controlled pollination test were studied to analyze floral characteristics and breeding system of the H.omeiense.The results showed that in 2022,the flowering period begined in the Mid September and ended in the beginning of November.The flowering period of a single plant was 16 to 22 days,and the life span of a single flower was 10 to 13 days.During flowering,strong stigma receptiv-ity and high pollen vialility have a overlapping period of 3 to 4 days.The hybridization index(OCI)was 4 and the pollen-ovule ratio was 276.1±24.1.It can be self-pollinated spontaneously.There was no apomix-es.The artificial cross-pollination rate was as high as 100％.There were significant differences in seed ger-mination rate and seedling growth trend between out-crossing and self-crossing,showing a decline trend of inbreeding.The breeding system of H.omeiense was a mixed mating system that need pollinators.The lack of pollinators was the main reason for its sexual reproductive failure.
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万方数据
