ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Textural changes during nectarine (Prunus persica) development and ripening.

Heyes, J. A. and Sealey, D. F.

Scientia Horticulturae Year: 1996 Vol: 65 Issue: 1 Pages: 49-58 Ref: 15 ref.

1996

บทคัดย่อ

Changes in nectarine cv. Fantasia fruit texture were measured during the last 10 weeks of fruit development before commercial maturity, and during ripening. Both tensile and compressive textural characteristics of mesocarp tissue were measured using an Instron Universal Testing Machine. Developmental fruit softening was primarily a consequence of cell expansion. On 3 occasions during the developmental series changes in texture during 3-5 days of postharvest storage at 20 deg C were compared with textural change over the same period on the tree. In the first 2 periods the fruits were not physiologically mature and harvested fruits did not undergo normal ripening. The distinctive patterns of change in tensile and compressive properties at these times were consistent with changes due to low turgor, as predicted by cellular theories. Harvested fruits from the third period (physiologically mature fruits producing ethylene at around 13 nmol kg-1 h-1) showed an accelerated rate of ripening and softenin

g compared with fruits left on the tree. Reductions in cell wall strength and cell-to-cell adhesion would explain the observed patterns of change in tensile and compressive properties of mature fruits. Scanning electron microscopy confirmed there was a change in the predominant cause of tensile failure from cell rupture in immature fruits to cell separation in mature fruits. A tensile parameter which correlated with this change is described.