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Plant and Cell Physiology, 1984, Vol. 25, No. 6 859-866
© 1984

Article

Localized Photosynthate Deposition in Citrus Fruit Segments Relative to Source-Leaf Position1

Karen E. Koch and Wayne T. Avigne

Fruit Crops Department, Institute of Food and Agricultural Science, University of Florida Gainesville, Florida 32611, U.S.A.

Photosynthate translocation into fruit segments was examined in ‘Pineapple’ sweet orange Citrus sinensis (L.) Osbeck to determine whether previously reported patterns of distribution [Koch (1984) HortScience 19: 260] would change over time or with alterations in balance between source leaves and sink fruit. In control plants, 14CO2 was supplied to a source leaf nearest the fruit for 1 h, followed by 5 h translocation. Over 89% of [14C]assimilates in the fruit were localized in 4 segments directly aligned with the source and 73% of these were in the center 2 segments. Peel, pulp and seeds showed similar patterns. Little or no lateral spreading of [14C]photosynthates occurred when an additional 7 days were allowed for translocation, but distribution was slightly broader when the source leaf was 8 nodes farther from the fruit. Defoliation and girdling to reduce the source/sink ratio gave variable results if done 18 h before experiments, but widened the area receiving [14C]assimilates to approximately half the fruit if done 7 days earlier. This occurred only when an entire fruit, was dependent upon a single source, leaving the opposite half fruit without an external supply of photosynthates. These data show an extreme degree of preferential translocation and inflexibility which can occur in a transport path.

1Supported by United States Department of Agriculture Competitive Research Grant 59-2121-1-1-752-0, Regional Project NC-142, and the Institute of Food and Agricultural Sciences, University of Florida.

(Received January 12, 1984; Accepted May 14, 1984)
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