摘要:
利用芒果花枝短截后剪口芽在当年还能再次进行花芽分化并开花结果的现象,研究花芽再次分化过程中ABA、GA3、IAA、ZR含量的变化规律。结果表明:花芽分化期间,芒果山庄、华侨农场、元江农场剪口芽内IAA一直保持较低水平;ABA含量分别下降到225.50、397.43、610.31 ngg-1FW,然后上升到13 016.4ngg-1FW;GA3、ZR含量分别上升到9 375.20、6 022.51、8 924.24 ngg-1FW;9 761.68、10 764.91、9 176.39 ngg-1FW。随着花芽分化的完成,芒果山庄、华侨农场、元江农场剪口芽内ABA、GA3、IAA、ZR含量分别下降到840.49、309.19、309.19 ngg-1FW;183.41、167.63、187.13 ngg-1FW;540.11、573.49、1 166.48 ngg-1FW;308.51、330.86、567.79 ngg-1FW。ABA/IAA、ZR/IAA、ABA/GA3及ZR/GA3在2月25日达到高峰,之后迅速下降,表明内源激素的平衡关系在芒果花芽分化过程中起着重要的调控作用。由此推测,增加植物体内ABA、ZR的含量或者降低GA3、IAA的含量都可以促进花芽分化。
Abstract:
The mango buds continue floral bud differentiation,to blossom and bear fruits in the same year after flower brands have been headed back.That observation initiated this study.The contents of ABA,GA3,IAA and ZR in the headed-back mango were determined.The results of the analysis for the buds collected from the Mango Shan Zhuang,Hua Qiao Nong Chang and Yuan Jiang Nong Chang showed that(a) during flower bud differentiation,IAA remained low in all samples;(b) ABA decreased to 225.50,397.43 and 610.31 ngg-1FW,respectively,then increased to 13016.4 ngg-1FW;(c) GA3 increased to 9375.20,6022.51 and 8924.24 ngg-1FW,respectively;(d) ZR increased to 9761.68,10764.91 and 9176.39 ngg-1FW,respectively;(e) when the flower bud differentiation was basically completed,the ABA decreased to 840.49,309.19 and 309.19 ngg-1FW,respectively;(f) at the same time,GA3 decreased to 183.41,167.63 and 187.13 ngg-1FW,respectively;(g) also,IAA decreased to 540.11,573.49 and 1166.48 ngg-1FW,respectively;and(h) ZR decreased to 308.51,330.86 and 567.79 ngg-1FW,respectively.The ratios of ABA/IAA,ZR/IAA,ABA/GA3 and ZR/GA3 peaked on February 25,then,decreased significantly.This suggested that balances between different endogenous hormones also played an important role in regulating and controlling mango's flower bud differentiation.It was concluded that by increasing the contents of ABA and ZR,or decreasing the contents of GA3 and IAA,mango flower bud differentiation could be accelerated.
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