| 摘要: |
| 对番茄采后各后熟生理时期的 ACC,乙烯水平及 EFE 酶活性变化以及与之相应的细胞超微结构进行了观察。乙烯产量从绿熟期到转红期没有明显变化,且水平相对较低。同时这几个时期的 ACC 水平也较一致。进入粉红期乙烯产量迅速上升并达到高峰,这时 ACC 水平降至最低点。高峰过后的全红期,过熟期乙烯水平迅速下降,而这时 ACC 水平逐渐上升至最高水平。EFE 酶活性在乙烯高峰前逐渐上升到最大值,高峰过后活性骤然降低直至失去活性。通过电镜观察,采后番茄果实细胞结构的最大变化在于乙烯高峰过后细胞壁的解体和质壁分离。在整个后热过程中,细胞膜结构、各细胞器依然完好,由于 ACC 的大量积累和乙烯水平下降与 EFE 活性有关,从而推断 EFE 酶的活性及作用不仅与膜结构有关而且同与膜有密切联系的细胞壁有关。 |
| 关键词: EFE 酶 乙烯 ACC |
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| ACTIVITY OF THE ETHYIENE-FORMING ENZYME IN RELATE TO THE ULTRASTRUCTURE OF TOMATO FRUIT DURING RIPENING |
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Luo Yunbo Lou Chenghou (Plant Physiology Lab)
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| Abstract: |
| The changes of ACC content,ethylene production and EFE activity in relate to ultrastructural changes of pericarp of tomato(LyCopersicon esculentum Mill)fruit were investigated during ripening.Striking changes in the structure of cell wall were noted with dissolution of middle lamlla and seperation of the cell wall and plasmolemma at various ripening stages after onset of ethyleno production while most of the organelles,especially the membranes remalnded relatively intact. The changes of ACC level indicated ... |
| Key words: ethylene forming enzyme ethylene amino-cyclopropane-1-carboxylic acid |
