PRO－LONG涂膜处理对后熟香蕉果实乙烯形成以及其它有关生理变化的影响

EFFECTS OF PRO-LONG COATING ON ETHYLENE BIOSYNTHESIS AND OTHER RELEVANT PHYSIOLOGICAL CHANGES OF BANANA FRUIT DURING RIPENING

摘要:

香蕉（ＭｕｓａａｃｕｍｉｎａｔａＣｏｌｌａｃｖ．ＤｗａｒｆＣａｖｅｎｄｉｓｈ）果实采后以商业上推荐使用的１．５％Ｐｒｏ－ｌｏｎｇ溶液处理，贮藏于２０℃和７５％相对湿度下，分别测定果实的ＡＣＣ含量、ＭＡＣＣ含量、ＥＦＥ酶活性、乙烯释放、叶绿素含量的变化和果实的硬度变化．结果表明，ＰＲＯ－ＬＯＮＧ处理延缓了香蕉果实果皮的叶绿素降解、硬度的下降以及乙烯释放的增加．在后熟过程中，处理果实的ＡＣＣ含量发生积累．ＡＣＣ含量的高峰在乙烯释放高峰和ＥＦＥ酶活性高峰之前出现．与对照比较，处理果实的ＡＣＣ含量和ＥＦＥ酶活性的高峰延迟了５ｄ出现．在后熟过程中，以Ｐｒｏ－ｌｏｎｇ处理果肉四片，其ＥＦＥ酶活性受部分抑制（抑制率为１９．４５％至４０．５１％）．果实ＭＡＣＣ含量在贮藏起初处于一个较显著水平，随着后熟的发展而逐步增加，但与ＡＣＣ含量的明显增加相比变化是微小的．我们的研究进一步阐明了ＰＲＯ－ＬＯＮＧ涂膜对香蕉果实后熟的影响主要是通过减少氧的供给，部分地抑制了ＥＦＥ酶活性，延缓了乙烯的形成和释放，从而延长了后熟过程．

Abstract:

Coating banana (Musa acuminata Colla cv. Dwarf Cavendish) fruitS with 1.5%Pro-long delayed chlorophyll breakdown in peel, the decrease in firmness of the fruit and the increase in ethylene production of the whole fruit. During ripening, the accumulation of ACC content occurred in banana fruit treated with Pro-long. The beak in ACC content appeared a short time before that in ethylene production and in EFE activity. The peaks in ACC content and EFE activity of Pro-long treated fruits occurred 5 days later than that of the control. During ripening EFE activity in banana pulp discs treated with Pro-long was partially inhibited (from 19.45% to 40.51%). MACC contentS in banana fruit were at significant levels at the beginning, and then increased gradually with the development of ripening, but only slightly as compared With the marked increase in ACC levels. We suggest that effectS of Pro-long coating on banana fruit during ripening mainly due to affecting ethylene biosynthesis of the fruit through partially inhibiting EFE activity by reducing the supplement of oxygen, so as to delay the increase in ethylene production and so extend the ripening processes.