外源赤霉素对台农一号芒果开花和坐果影响研究

摘要

为探究生长调节剂对芒果开花结果的调控作用,采用单因素随机区组试验设计,研究了不同浓度的赤霉素对台农一号芒果抽生花序及坐果的影响。结果表明：台农一号芒果摘除早花后,叶面喷施一次40、70、100 mg・L-1的赤霉素液,均有降低二次花抽花率的作用。赤霉素浓度100 mg・L-1时抽花率最低,70与40 mg・L-1之间差别不大。在第一次落果高峰期,用25、50、70 mg・L-1赤霉素液喷施果穗,总坐果数均有大幅增加。赤霉素液喷施果穗,增加的果数大部分是无胚果,对正常果坐果率无明显促进作用,在70 mg・L-1浓度时,正常果的数量反而减少。喷施赤霉素70 mg・L-1的无胚果数最多,50、25 mg・L-1次之,最低为对照。%　　In order to explore the adjust function of Growth regulator ,the single-factor randomized block experi-ment was adopted to study the effect of different concentration exogenous GA 3 on the flowering rate and fruit setting of mango variety Tainong No .1 .The result in the field showed that 40、70 and 100 mg・L-1 of GA3 ,all of them would reduce secondary flowing rate .100 mg・L-1 of GA3 had the lowest rate .There was no difference be-tween 70 and 40 mg・L-1 GA3 .During the first peak of physiological drop ,25、50 and 70 mg・L-1 of GA3 sprayed on Tainong No .1 Mango’ s clusters ,the fruit setting increased greatly ,but most of them were without embryos fruit ,and it was maximum when sprayed on 70 mg・L-1 of GA3 ,followed by 50 and 25 mg・L-1 ,there was no stimulation to normal fruit setting ,however ,at the 70 mg・L-1 ,the normal fruit reduced .