Contents of non-structural carbohydrates in fruiting cape gooseberry (Physalis peruviana L.) plants
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Universidad Nacional de Colombia
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Although the cape gooseberry has become the second mostimportant export fruit in Colombia, information is scarce forits carbohydrate partitioning, which plays a major role in plantproductivity. Seed-propagated Colombia ecotypes were keptin a greenhouse in 2.5-L plastic containers filled with washedquartz sand and were ferti-irrigated. The plants were pruned toone main vegetative stem with two generative stems. Dry matter(DM) partitioning during the initial plant growth showed thehighest accumulation rate in the roots during the first 20 days,whereas, at a later stage of development, the shoot DM gain washigher and the leaf DM gain was lower than that of the roots.Sixty days after transplant, the plant parts were quantified andanalyzed for glucose, fructose, sucrose, and starch. The rootswere the largest carbohydrate pool for starch, but the sucrosecontent was lower in the roots than in the vegetative stem andthe lower part of the reproductive stems. At 5-15 cm of thevegetative stem base, 6.4 mg of starch, 1.4 mg of monosaccha-rides and 5.3 mg/100 g of DM sucrose were found, indicatingthat this lower organ is also important for starch accumulationand, especially, for sucrose transport. In the two reproductivestems, the starch contents were much higher in the base partthan in the apical part; the same relationship was found inthe leaves. The monosaccharide content was the highest inthe apical stem position with 8.2 mg/100 g DM. In contrast,the apical-positioned 10-day-old fruits had maximum starchconcentrations (11.6 mg/100 g DM), possibly due to the as-similatory starch from green fruit photosynthesis, whereas themature basal fruits (60-day-old) mainly accumulated sucrose(25.7 mg) and monosaccharides (21.2 mg/100 g DM).
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