Effects of plant growth regulating substances on pollen germination and tube growth in Chaohong peach

【Objective】 The effects of five plant growth regulating substances such as GA3,6-BA,2,4-D,NAA and PP333 with different mass concentrations on pollen germination and tube growth of Chaohong peach were studied.【Method】 Peach pollen was gathered and cultivating liquid was confected,including the plant growth regulating substances with different mass concentrations,the method of liquid media to cultivate pollen was taken in order to research the effects of plant growth regulating substances with different mass concentrations on pollen germination and pollen tube growth.【Result】 Results showed that GA3,6-BA,2,4-D would stimulate pollen germination and tube growth when they were in lower mass concentrations,but they would inhibit pollen germination and tube growth when they were in higher mass concentrations,the most suitable mass concentrations that would stimulate pollen germination and tube growth were 25-100 mg/L,12.5-25 mg/L and 0.5-5 mg/L;NAA inhibited pollen germination and tube growth,the inhibitoty effect became stronger with the increase of the mass concentration;PP333 had inhibitoty effect on pollen germination,the inhibitory effects became stronger with the increase of the mass concentration,while it had stimulating effect on pollen tube growth when it was in lower mass concentration.The most suitable mass concentration for pollen tube growth was 100 mg/L.【Conclusion】 The most suitable mass concentrations that stimulated pollen germination and tube growth of GA3,6-BA and 2,4-D were 25-100 mg/L,12.5-25 mg/L and 0.5-5 mg/L,NAA inhibited pollen germination and tube growth;PP333 had inhibitoty effect on pollen germination,while it had stimulating effect on pollen tube growth when it was in the mass concentration of 50-100 mg/L.