ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Influences of precooling and silver thiosulphate on leaf abscission of two forms of rice flower.

Johnston, M. E.; Tisdell, J. G.; Simons, D. H.;

Postharvest Biology and Technology Year: 1992 Vol: 2 Issue: 1 Pages: 25-30 Ref: 5 ref.

1992

บทคัดย่อ

Flowering stems of Helichrysum diosmifolium, an Australian wild flower commonly called rice or sago flower, are exported to Japan. Flowering stems of both the broad- and fine-leaved forms were either precooled or not precooled. Precooling involved holding stems for 2 h at 0 deg C within 4 h of harvest. During precooling, the stems were either kept dry or in water at 20 deg C. Some stems were pulsed with 4 mM silver thiosulphate (STS) for 15 min, prior to precooling in water. The stems which were not precooled were either kept dry or in water at 20 deg for 4 h, or were pulsed with 1 mM STS for 15 min and kept in water for 4 h. Leaf drop occurring 10, 12 and 14 days after harvest from flowering stems of both forms was reduced by STS pulsing. The most severe leaf drop occurred when flowering stems were not precooled and were kept dry until the assessment stage of the experiment. Severe leaf drop occurred 10, 12 and 14 days after harvest in flowering stems that were kept in water during precooling. The fine-leaved form had its longest vase life when it was precooled and the stems kept dry during this treatment. However, for the broad-leaved form, the longest vase life was obtained by pulsing stems with STS, followed by precooling with stems kept in water.