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苹果成熟前后果柄的过氧化物酶(PRO)活性比果实中的高,两者的 PRO 活性皆在呼吸高峰(约在盛花后150天)前5天显著上升,当时果柄中的 PRO 活性比果实中的约高14倍。果实中的同工酶在盛花后145天,酶谱的位置有变动,酶带数目不变;果柄中的酶带数目从7条增加到9条。果实中的 PRO 活性比吲哚乙酸(IAA)氧化酶活性高,尤其是果柄中的 PRO活性比 IAA 氧化酶活性高得多。推测 IAA 或其它成熟抑制物质在进入果实以前,可能主要被果柄中的 PRO 氧化分解,而 IAA 氧化酶所起的作用较小。
The fruit pericarp had higher peroxidase (PRO) activity than the fruit, and the PRO activity of both of them increased significantly at the peak of respiration (about 150 days after flowering), and the activity of PRO in the stalk About 14 times higher than in fruits. The isoenzyme in fruit 145 days after the full bloom, the position of the zymogram changes, the number of enzyme bands unchanged; fruit stalk in the number of bands increased from 7 to 9. The PRO activity in fruits is higher than that of indoleacetic acid (IAA) oxidase, especially the activity of PRO in stems is much higher than that of IAA oxidase. It is speculated that IAA or other mature inhibitory substances may be mainly oxidized and oxidized by PRO in the stalk before entering the fruit, while IAA oxidase has less effect.