With a Little Help from My Cell Wall: Structural Modifications in Pectin May Play a Role to Overcome Both Dehydration Stress and Fungal Pathogens

Forand, Ariana D.; Finfrock, Y. Zou; Lavier, Miranda; Stobbs, Jarvis; Qin, Li; Wang, Sheng; Karunakaran, Chithra; Wei, Yangdou; Ghosh, Supratim; Tanino, Karen K.

doi:10.3390/plants11030385

Title: With a Little Help from My Cell Wall: Structural Modifications in Pectin May Play a Role to Overcome Both Dehydration Stress and Fungal Pathogens

Journal Article · 30 January 2022 · Plants

DOI: https://doi.org/10.3390/plants11030385 · OSTI ID:1883616

Forand, Ariana D. ^[1]; Finfrock, Y. Zou ^[2];

^[3]; Stobbs, Jarvis ^[3];

^[1]; Wang, Sheng ^[1]; Karunakaran, Chithra ^[3]; Wei, Yangdou ^[1];

^[1]; Tanino, Karen K. ^[1]

University of Saskatchewan, Saskatoon, SK (Canada)
Argonne National Lab. (ANL), Lemont, IL (United States); Canadian Light Source, Saskatoon (Canada)
Canadian Light Source, Saskatoon (Canada)

Cell wall structural modifications through pectin cross-linkages between calcium ions and/or boric acid may be key to mitigating dehydration stress and fungal pathogens. Water loss was profiled in a pure pectin system and in vivo. While calcium and boron reduced water loss in pure pectin standards, the impact on Allium species was insignificant (p > 0.05). Nevertheless, synchrotron X-ray microscopy showed the localization of exogenously applied calcium to the apoplast in the epidermal cells of Allium fistulosum. Exogenous calcium application increased viscosity and resistance to shear force in Allium fistulosum, suggesting the formation of calcium cross-linkages (“egg-box” structures). Moreover, Allium fistulosum (freezing tolerant) was also more tolerant to dehydration stress compared to Allium cepa (freezing sensitive). Furthermore, the addition of boric acid (H₃BO₃) to pure pectin reduced water loss and increased viscosity, which indicates the formation of RG-II dimers. The Arabidopsis boron transport mutant, bor1, expressed greater water loss and, based on the lesion area of leaf tissue, a greater susceptibility to Colletotrichum higginsianum and Botrytis cinerea. While pectin modifications in the cell wall are likely not the sole solution to dehydration and biotic stress resistance, they appear to play an important role against multiple stresses.

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Research Organization:: Argonne National Laboratory (ANL), Lemont, IL (United States)

Sponsoring Organization:: Canada Foundation for Innovation (CFI); Canadian Institutes of Health Research (CIHR); National Research Council (Canada); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE Office of Science (SC); University of Saskatchewan

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1883616

Journal Information:: Plants, Journal Name: Plants Journal Issue: 3 Vol. 11; ISSN 2223-7747

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
Allium and X-ray microscopy
Botrytis cinerea
Colletotrichum higginsianum
boron
calcium
cell wall
dehydration
homogalacturonan
pectin
rhamnogalacturonan II

Title: With a Little Help from My Cell Wall: Structural Modifications in Pectin May Play a Role to Overcome Both Dehydration Stress and Fungal Pathogens

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