ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Changes in kiwifruit cell wall ultrastructure and cell packing during postharvest ripening.

Hallett, I. C.; MacRae, E. A.; Wegrzyn, T. F.;

International Journal of Plant Sciences Year: 1992 Vol: 153 Issue: 1 Pages: 49-60 Ref: 27 ref.

1992

บทคัดย่อ

Light, scanning electron and transmission electron micrographs of ripening kiwifruits were compared at different stages of softening (determined by firmness readings made with a penetrometer). The 3 tissues of the fruit, outer pericarp, inner pericarp, and core, differed in packing and cell size. Morphometric studies indicated that the volume of intercellular air spaces increased as the fruits softened. Cell walls swelled in the outer pericarp earlier than in the core and, in both tissues, well before the climacteric. Except for plasmodesmatal regions, staining of cell wall material markedly declined or was lost in ripe fruits. Middle lamella breakdown was evident in samples taken from fruits when ripe and just prior to ripeness, and electron-dense bodies accumulated between the plasmalemma and cell wall. The results are consistent with the findings of other studies on changes in chemical composition and indicate that kiwifruit cell walls undergo ultrastructrual changes during ripening similar to those in other fruits. However, the extent of cell wall swelling, loss of stainability, and timing of the changes differs.