บทคัดย่องานวิจัย

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Regulation by carbon dioxide of wound-induced ethylene biosynthesis in tomato pericarp and winter squash mesocarp tissues.

Mathooko, F. M.; Kubo, Y.; Inaba, A.; Nakamura, R.;

Postharvest Biology and Technology Year: 1993 Vol: 3 Issue: 1 Pages: 27-38 Ref: 27 ref.

1993

บทคัดย่อ

Regulation by carbon dioxide of wound-induced ethylene biosynthesis in tomato pericarp and winter squash mesocarp tissues.

The effects of CO2 treatment on wound-induced ethylene biosynthesis were investigated in excised tomato (cv. TVR-II) pericarp tissue and excised winter squash (Cucurbita maxima cv. Ebisu) mesocarp tissue. Wounding increased ethylene production rate, 1-aminocyclopropane-1-carboxylic acid (ACC) and 1-(malonylamino)cyclopropane-1-carboxylic acid (MACC) contents and ACC synthase and ACC oxidase activities. The increases in the rate of ethylene production and ACC synthase activity were suppressed by CO2 treatment and were dependent on CO2 concentration. CO2 treatment suppressed the wound-induced increase in ACC content irrespective of CO2 concentration. CO2 at 10% had no effect on ACC conjugation to MACC induced by wounding while 60% CO2 almost completely suppressed ACC conjugation. CO2 promoted induction of ACC oxidase activity in excised tomato tissue, and inhibited induction of ACC oxidase activity in excised squash tissue. These results suggest that CO2 inhibits wound-induced ethylene biosynthesis by reducing the availability of ACC through repression of ACC synthase synthesis and/or inhibition of its activity. Endogenous ethylene produced in response to wounding may also play a role in the regulation of wound-induced ethylene production.