Sucrose Synthase Isozymes Related to Sucrose Accumulation During Fruit Development of Japanese Pear (Pyrus pyrifolia Nakai).

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  • ニホンナシ果実の生長成熟過程におけるスクロース蓄積に関係するスクロース合成酵素アイソザイム

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Abstract

The relationship between sucrose metabolizing enzymes, especially sucrose synthase (SS) isozymes and sucrose accumulation was investigated throughout fruit development of the Japanese pear. The sucrose content in the fruit which was very low at the young stage, drastically increased with maturation, as did the sucrose phosphate synthase activity. The activities of soluble and cell wall-bound acid invertases, which were high in the young fruit, decreased rapidly during fruit maturation. SS activity was, likewise, high in young fruit but decreased with fruit enlargement ; however, it rose again concomitant with sucrose accumulation during maturation. The fluctuation in SS activity was caused by two SS isozymes (SSI and SSII) ; SSI activity was high in young fruit and decreased with fruit development, while SSII activity, which was very low in young fruit, increased with fruit development. These results indicate that these two isozymes differ in their functions. SSII catalyzes sucrose synthesis which contributes to sucrose accumulation during fruit maturation, whereas SSI facilitates sucrose cleavage together with acid invertases and supplies substrates for growth in young fruits.

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