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《Acta Botanica Sinica》 1996-09
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EFFECTS OF NIFEDIPINE ON POLLEN GERMINATION, POLLEN TUBE GROWTH AND DIVISION OF GENERA TIVE NUCLEUS IN NICOTIANA TABACUM

Fan Liu min,Yang Hong yuan and Zhou Chang (Laboratory of Plant Reproductive Biology,College of Life Science, Wuhan University, Wuhan 430072)  
The deals with the effects of nifedipine (Nif), a Ca 2+ channel blocker of rather high specificity,on pollen germination,pollen tube growth and division of generative nucleus (GN) in experimentlly germinated pollen tubes of Nicotiana tabacum L. Pollen germination was inhibited by the addition of 10 -4 mol/L Nif whereas no significant inhibition by 10 -7 ~10 -5 mol/L Nif was observed.The effects of Nif on pollen tube growth were related to its concentration and duration of treatment.At the earlier stage, tube growth was promoted at the lower concentrations (10 -7 ~10 -5 mol/L),but was significantly inhibited at a concentration of 10 -4 mol/L Nif.With increasing time of culture,even the lower concentrations also became harmful;the stronger the concentration,the earlier the transition from promotion to inhibition.Generally, inhibition of tube growth occurred within 24 hours of culture with different extent in various concentrations. Moreover, higher concentrations also tended to disturb tube morphology and cytoplasmic streaming.Nif was observed to perturb GN division at various concentrations,either blocked it completely at 10 -4 mol/L,or only delayed it at 10 -7 ~10 -5 mol/L.The dynamics of membrane associated calcium in pollen tubes was tested with chlorotetracycline (CTC).With increasing time of culture and escalating Nif concentration,CTC fluorescence weakened gradually,indicating that the physiological effects of Nif is mediated by its in hibition on Ca 2+ channel activities.
【Fund】: 国家自然科学基金
【CateGory Index】: Q944.4
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