บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Evaluation of rheological properties contributing to fruit texture

Martin, R., Dawson, D., Sakurai, N. and Nevins, D. J.

Acta Horticulturae Year: 1998 Issue: No. 464 Pages: 405-410.

1998

บทคัดย่อ

Evaluation of rheological properties contributing to fruit texture.

Transgenic tomato isolines wild-type, antisense-PG, antisense-PME, rin and rin[(E8/PG)/(E8/PG)] have been created having reduced or enhanced levels of single pectin degrading enzymes, with the purpose of altering fruit texture. However, because of limitations in current methods of fruit textural analysis, it has been difficult to identify and characterize the often subtle effects of altered pectin chemistry on fruit texture. Stress relaxation measurements provided additional insights beyond that which could be achieved by conventional textural analysis. The methodology permits the acquisition of time-dependent as well as non-time-dependent parameters. Important texture differences between transgenic genotypes could be identified using stress-relaxation analysis. Antisense-PG fruits were significantly more resistant to initial load stress than wild-type isolines, but relaxation of tissue following stress application in antisense-PG fruits was not significantly altered. In contrast, antisense-PME

fruits showed no alteration in resistance to initial load stress, but the time required for relaxation of tissue following stress was significantly lower in antisense-PME fruit than in wild-type isolines. In rin[(E8/PG)/(E8/PG)] fruits, resistance to initial load was lower and time of relaxation was longer than in wild-type fruits. In transformed rin fruits, the pericarp was softer but nevertheless the analysis suggested the development of a higher tissue viscosity.