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Title: Efficient phloem remobilization of Zn protects apple trees during the early stages of Zn deficiency

Journal Article · · Plant, Cell and Environment
DOI: https://doi.org/10.1111/pce.13621 · OSTI ID:1637927
 [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [3]; ORCiD logo [1]
  1. Zhejiang Univ., Hangzhou (China)
  2. Univ. of California, Davis, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
+ Show Author Affiliations

Apple trees are extensively cultivated worldwide but are often affected by zinc (Zn) deficiency. Limited knowledge regarding Zn remobilization within fruit crops has hampered the development of efficient strategies for providing adequate amounts of Zn. In the present study, Zn distribution and remobilization were compared among apple trees cultivated under different Zn conditions. Without Zn application, plants showed visible symptoms of Zn deficiency at the shoot tips after 1 year but appeared to grow normally during the first 6 months (early stage of Zn deficiency). Compared with apple plants under sufficient Zn treatment, plants suffering from early-stage Zn deficiency showed preferential Zn distribution to young leaves and higher Zn levels in phloem, demonstrating that hidden Zn deficiency triggers a highly efficient remobilization of Zn in this species. The in vivo Zn-nicotianamine complex in phloem tissues, combined with the significant enhanced expression of MdNAS3 and MdYSL6 , suggested a positive role for nicotianamine in the phloem remobilization of Zn. These results strongly suggest that a proportion of Zn in the old leaves of apple trees can be efficiently remobilized by phloem transport to the shoot tips, partially in the form of Zn-nicotianamine, thus protecting apple trees against the early stages of Zn deficiency.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; 31471939
OSTI ID:
1637927
Journal Information:
Plant, Cell and Environment, Vol. 42, Issue 12; ISSN 0140-7791
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Figures / Tables (12)

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Related Subjects

59 BASIC BIOLOGICAL SCIENCES
apple plants
distribution
fruit crops
micro X‐ray fluorescence
nicotianamine
phloem
remobilization
speciation
zinc
zinc deficiency