ISHS Acta Horticulturae 518: XXV International Horticultural Congress, Part 8: Quality of Horticultural Products
CUT ROSE QUALITY AS AFFECTED BY CALCIUM SUPPLY AND TRANSLOCATION |
| Authors: | R. Baas, N. Marissen, A. Dik |
| Keywords: | Botrytis cinerea, Rosa, calcium, cut rose, plant nutrition, quality |
| Abstract:
Possible relations between Ca and quality characteristics of cut roses (Rosa hybrida) were studied. In greenhouse experiments, factors presumably influencing the Ca flux in the xylem and/or the assimilate flux in the phloem were investigated with cut rose grown in a rockwool system. Previous work in 1996 had indicated that Ca in the buds was particularly influenced by the Ca concentration in the nutrient solution and by leaf removal. However, no effects on post-harvest parameters were found. In 1997, effects of Ca concentration and nutrient solution composition were studied in more detail in cut rose varieties First Red, Escada and Mercedes. It was found that compared to 4 and 7 mM Ca, 0.5 mM Ca decreased the number of stems and stem weight (length), particularly at higher K and Mg concentrations. Under Ca-deficient conditions, susceptibility to Botrytis cinerea was increased, necrosis and abscission of the older leaves occurred, and petal necrosis was slightly higher. Ca uptake and transport within rose is discussed. | |
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