Usually primocanes (vegetative) and floricanes (reproductive) are present at the same time. ![]() On cultivated red raspberry plants, biennial canes grow on a perennial root system. Keywords: Rubus idaeus nonheated greenhouse carbohydrate starch soluble protein Our experiment suggested that in red raspberry plants grown under poor environmental conditions, current yield is reduced but there is enough carbohydrate accumulation to support next year's growth. Reserve carbohydrates in the root system were unaffected by pruning and cane density, and were rapidly used during active vegetative growth, began to recover just after bloom, and were fully recovered at the end of the season. Soluble protein concentrations did not differ significantly between pruning dates. Sucrose concentration was higher in fine roots than in suberized roots and had a slight decrease during flowering and the beginning of harvest. ![]() Earlier pruning dates corresponded to earlier fruit production, but yield was significantly reduced on later pruning dates and higher cane densities. Relative root biomass decreased from pruning to first flower stage and remained constant thereafter for all pruning dates. ![]() Three summer-pruning dates (early, mid, and late July) and four cane densities (8, 16, 24, and 32 canes/m row) were imposed. ![]() In a 2-year experiment (19), plants of primocane-fruiting red raspberry cultivar ‘Autumn Bliss’ grown in a plastic greenhouse were destructively harvested at different growth stages to determine the effect of pruning date and cane density on dry matter distribution, carbohydrate concentration, and soluble protein concentration in different plant parts.
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