The Relationship between Carbohydrate Translocation and the LeaftoFruit Ratio in Walnut Trees

다국어 초록 (Multilingual Abstract)

This study determined the relationship between the leaftofruit ratio (LFR) and carbohydrate translocation in walnut tree. We artificially manipulated the LFR to analyze the specific mass transfer rate (SMTR), physical traits, carbohydrate content, and metabolismrelated enzyme activity in the carpopodium of girdled fruitbearing shoots with different LFRs. Our findings showed that when the same number of leaves was retained on the girdled shoots, the glucose content, acid invertase (AI) and sucrose phosphate synthase (SPS) activity, SMTR, and phloem area (PA) increased significantly with decreasing LFR (p < 0.05), whereas the sucrose and starch content, carpopodium diameter growth rate (CDGR), and carpopodium length growth rate (CLGR) did not change significantly (p > 0.05). When the same number of fruits was retained on the girdled shoots, the glucose, sucrose and starch content, AI and SPS activity, SMTR, CLGR, and CDGR of the carpopodium increased significantly with increasing LFR (p < 0.01), whereas the PA and carpopodium length did not change significantly (p > 0.05). The above results suggested that the carbohydrate translocation was adjusted by regulating the carpopodium AI activity by changing the LFR in walnut shoots, while the amount of carbohydrate allocated to the carpopodium was determined by the availability of carbohydrates from the sources.

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