ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The relationship between petal water potential and levels of abscisic acid in rose flower.

Orlandini, M.; Arene, L.; Page-Degivry, M. T. le;

Acta Horticulturae Year: 1991 Issue: No. 298 Pages: 161-164 Ref: 7 ref.

1991

บทคัดย่อ

Rosa hybrida (cv. Sonia) stems were harvested and placed individually in suspensions containing Pseudomonas aeruginosa, isolated from rose stems, at 5 x 109 cfu/ml. The suspensions were untreated, or had been held at 75 deg C for 15 min (pasteurized, to inactivate bacteria) or at 121 deg for 15 min (sterilized, to kill bacteria). The stems were kept in the suspensions at 20 deg for 0.5-4.0 h. In further experiments, stems were placed individually in aqueous suspensions of 1 g cellulase/litre or 1 g egg albumin/litre (both about 50 kDa), or an aqueous solution of extracellular slime from P. aeruginosa. Water uptake and hydraulic conductance of the basal 5 cm of the stem were determined. All 3 bacterial suspensions significantly reduced water uptake and hydraulic conductance of the stems compared with control stems. Hydraulic conductance was reduced to 25% of control values within 0.5 h in all 3 bacterial suspensions. The cellulase and egg albumin suspensions and the bacterial slime solution alsorapidly reduced hydraulic conductance. When pasteurized or sterilized bacterial suspensions were kept at 5 deg for 7 days (resulting in cell fragmentation), hydraulic conductance and water uptake were further reduced. The results indicate that vascular blockage depends on particle size and is not dependent on the action of a living organism, nor is it a physiological response of the rose stem.