Overexpression of plasma membrane SUT1 in poplar alters lateral sucrose partitioning in stem and promotes leaf necrosis

Xue, Liang‐Jiao; Hozain, Moh'd I.; Frost, Christopher J.; Talebi, Afraz; Nyamdari, Batbayar; Aulakh, Kavita B.; Zhou, Ran; Harding, Scott A.; Tsai, Chung‐Jui

doi:10.1002/pld3.70023

Title: Overexpression of plasma membrane SUT1 in poplar alters lateral sucrose partitioning in stem and promotes leaf necrosis

Journal Article · 11 March 2025 · Plant Direct

DOI: https://doi.org/10.1002/pld3.70023 · OSTI ID:2530639

^[1]; Hozain, Moh'd I. ^[2]; Frost, Christopher J. ^[3]; Talebi, Afraz ^[4]; Nyamdari, Batbayar ^[4]; Aulakh, Kavita B. ^[2]; Zhou, Ran ^[5];

^[4];

^[5]

Warnell School of Forestry and Natural Resources University of Georgia Athens GA USA, Department of Genetics University of Georgia Athens GA USA, State Key Laboratory of Tree Genetics and Breeding, College of Forestry Nanjing Forestry University Nanjing Jiangsu China
Warnell School of Forestry and Natural Resources University of Georgia Athens GA USA, Department of Genetics University of Georgia Athens GA USA
Warnell School of Forestry and Natural Resources University of Georgia Athens GA USA, BIO5 Institute Danville VA USA
Warnell School of Forestry and Natural Resources University of Georgia Athens GA USA
Warnell School of Forestry and Natural Resources University of Georgia Athens GA USA, Department of Genetics University of Georgia Athens GA USA, Department of Plant Biology University of Georgia Athens GA USA

Abstract In Populus and many other tree species, photoassimilate sucrose diffuses down a concentration gradient via symplastically connected mesophyll cells to minor vein phloem for long‐distance transport. There is no evidence for apoplastic phloem‐loading in Populus . However, plasma membrane sucrose transporters (SUT1 and SUT3) orthologous to those associated with apoplastic phloem loading are expressed in vascular tissues of poplar. While SUT3 functions in sucrose import into developing xylem, the role of SUT1 remains unclear. Here, we overexpressed PtaSUT1 in Populus tremula x P. alba to examine the effects on sucrose partitioning in transgenic plants. Overall leaf sucrose levels were similar between wild type and transgenic lines. Stem sucrose levels were not changed in bark but were significantly reduced in the adjacent xylem, suggesting hindered intercellular sucrose trafficking from the phloem to the developing xylem. Fully expanded leaves of transgenic plants deteriorated prematurely with declining photosynthesis prior to severe necrotic spotting. Necrotic spotting advanced most rapidly in the distal portion of mature leaves and was accompanied by sharp hexose increases and sharp sucrose decreases there. Leaf transcriptome profiling and network inference revealed the down‐regulation of copper proteins and elevated expression of copper microRNAs prior to noticeable leaf injury. Our results suggest ectopic expression of PtaSUT1 altered sucrose partitioning in stems with systemic effects on leaf health and copper homeostasis mediated in part by sucrose‐sensitive copper miRNAs.

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Research Organization:: University of Georgia, Athens, GA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0005140

OSTI ID:: 2530639

Journal Information:: Plant Direct, Journal Name: Plant Direct Journal Issue: 3 Vol. 9; ISSN 2475-4455

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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