대추나무(Zizyphus jujuba Miller)의 交配育種을 爲限 受精障害因究明 및 育種方法開發에 관한 硏究 : I.開花狀態에 따른 花粉發芽率 및 花粉發芽促進에 관한 硏究 I.Pollen Germination as related to Flowering Stage and Effective Substances on Pol = Studies on Cause of Low Fruit Setting in Artificial Pollinated Flowers and on Developrrant of Artificial Pollinating Method in Chinese Jujube(Zizyphus jujuba Miller)

다국어 초록 (Multilingual Abstract)

In order to investigate the cause of low fruit setting in the artificial Pollinated flowers in Chinese jujube, the in vitro 맨lien germination was studied with effective substances added on the medium. Pollen germination varied with flowering stage with the highest germination rate at just after flowering in both cultivars. Pollen germination rate reduced below 30% after 6 hours from flowering. Boron 0.1% and sucrose respectively promoted pollen germination rate when added on medium. NAA 100ppm among plant growth regulators treated on medium was the most effective in pollen germination. None pollen germination observed in nectar collected from flowers. It was suggested that the impossible artificial pollination in Chinese jujube was not caused by un-usual pollen germination.