ISHS Acta Horticulturae 405: VI International Symposium on Postharvest Physiology of Ornamental Plants
CULTIVAR DIFFERENCES WITH RESPECT TO STORAGE POTENTIAL AND CARBOHYDRATE STATUS OF ROOTED CHRYSANTHEMUM CUTTINGS |
| Authors: | Nihal C. Rajapakse, John W. Kelly |
| Abstract:
Low temperature storage potential of rooted garden chrysanthemum [Dendranthema x grandiflorum (Ramat.) Kitamura] cultivars and its relationship with carbohydrate reserves were evaluated. Quality of rooted cuttings stored between 0 to 3C for four weeks varied with the cultivar. Quality of 'Emily' and 'Naomi' cuttings was reduced within a week in dark storage at 0 to 3C due to the development of necrotic areas, while 'Anna' and 'Debonair' cuttings could be held for 4 to 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 four week dark storage. Depletion of soluble sugar pools during low temperature dark storage was greater in 'Emily' and ‘Naomi’ cultivars than in 'Anna' and 'Debonair' cultivars. Low irradiance (≈10 μmol·m-2·s-1 photosynthetically active radiation [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 dark stored cuttings. Medium and high (25 to 35 μmol· m-2·s-1) irradiance in storage increased leaf and stem dry matter accumulation compared to dark or low light stored plants. Results indicate that storage potential of rooted chrysanthemum cuttings vary considerably among cultivars and that the loss of carbohydrate pools are greater in cultivars with 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. | |
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