Cultivar differences with respect to storage potential and carbohydrate status of rooted chrysanthemum cuttings.
Rajapakse, N. C.; Kelly, J. W.;
Acta Horticulturae Year: 1995 Issue: No. 405 Pages: 427-434 Ref: 18 ref.
1995
บทคัดย่อ
ABSTRACT :
Low temperature storage potential of rooted garden chrysanthemum cultivars and its relationship to carbohydrate reserves were evaluated. The quality of rooted cuttings stored at 0-3 deg C for 4 weeks varied with the cultivar. The quality of Emily and Naomi cuttings was reduced within a week in dark storage at 0-3 deg due to the development of necrotic areas, while Anna and Debonair cuttings could be held for 4-6 weeks without a significant quality loss at these temperatures. Regardless of the storage temperature, leaf and stem soluble sugar concentrations were significantly reduced by 4 weeks' dark storage. Depletion of soluble sugar pools during low temperature dark storage was greater in Emily and Naomi than in Anna and Debonair. Low irradiance (approx equal to 10 micro mol m-2 s-1 PAR) in storage greatly improved overall quality and delayed the development of leaf necrosis in Naomi. Cuttings stored in light were darker green and had higher leaf and stem carbohydrate concentrations than those
stored in the dark. Medium and high (25-35 micro mol m-2 s-1) irradiance in storage increased leaf and stem DM accumulation compared with storage in the dark or in low light. Results indicate that the storage potential of rooted chrysanthemum cuttings vary considerably among cultivars and that the loss of carbohydrate pools are greater in cultivars with a short storage life. Light in low temperature storage is beneficial for maintaining carbohydrate pools and delaying the development of leaf necrosis in cultivars with short storage life.