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2020 Vol.38, Issue 3 Preview Page

Research Article

The Relationship between Carbohydrate Translocation and the Leaf-to-Fruit Ratio in Walnut Trees
Cuifang Zhang1
,
Cunde Pan1*
,
Hong Chen1
,
Shiwei Wang1
1Collage of Forestry and Horticulture, Xinjiang Agricultural University/Key Laboratory of Forestry Ecology and Industry Technology in Arid Region, Education Department of Xinjiang
* Corresponding Author
30 June 2020. pp. 308-322
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Abstract

This study determined the relationship between the leaf-to-fruit 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 metabolism-related enzyme activity in the carpopodium of girdled fruit-bearing 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.

Keywords
carbohydrate metabolism
carpopodium
Juglans regia
physical traits
source-sink relationship

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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :원예과학기술지
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 38
  • No :3
  • Pages :308-322
  • Received Date : 2019-12-23
  • Revised Date : 2020-01-30
  • Accepted Date : 2020-02-23
  • DOI :https://doi.org/10.7235/HORT.20200030
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