Characteristics of Carbohydrate Assimilation and Distribution in Walnut (Juglans regia L.)

Shi-Wei Wang; Cun-De Pan; Cui-Fang Zhang; Hong Chen

doi:10.7235/HORT.20210014

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2021 Vol.39, Issue 2 Preview Page Next Page

Research Article

Characteristics of Carbohydrate Assimilation and Distribution in Walnut (Juglans regia L.)

30 April 2021. pp. 152-166

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Abstract

Based on ¹³C isotope tracer technology, we investigated the ¹³C abundance (δ¹³C), ¹³C content (¹³C_amount), and new fixed ¹³C percentage (¹³C_PCT) in different organs and different metabolic components in girdled fruit-bearing shoots at different stages of fruit growth and development in walnut. Our aim was to analyze the dynamic characteristics of carbohydrate assimilation, transportation, and utilization in different stages of walnut fruit growth and development. The results showed that (1) at 0 h after the feeding, δ¹³C, ¹³C_amount, and ¹³C_PCT in sucrose from the leaves were the highest and positively correlated with net photosynthetic rate of leaves (p < 0.05); (2) at 24 h after the feeding, δ¹³C, ¹³C_amount, and ¹³C_PCT in sucrose from the carpopodium reached their peak values; (3) δ¹³C, ¹³C_amount, and ¹³C_PCT in sucrose from the peel were lower than those of hexose at 48 h after feeding in the fast-growing stage, but they all reached maximum levels in peel sucrose at 48 h after feeding in the oil conversion stage; and (4) the highest δ¹³C, ¹³C_amount, and ¹³C_PCT were recorded in all carbohydrates from the seed kernel 48 h after feeding, among which the highest δ¹³C, ¹³C_amount, and ¹³C_PCT were recorded in sucrose. These results suggested that sucrose was the main form of carbohydrate assimilation and transportation in walnut fruit, and large amounts of sucrose are accumulated in the peel and in the kernel, where it is also the base for the transformation of oil.

Keywords

¹³C isotope

carpopodium

fruit development

photosynthesis

seasonal changes

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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 : 39
No :2
Pages :152-166
Received Date : 2020-06-29
Revised Date : 2020-10-28
Accepted Date : 2020-12-03
DOI :https://doi.org/10.7235/HORT.20210014

Horticultural Science and Technology ISSN:1226-8763(Print) 2465-8588(Online) 원예과학기술지

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