Starch-to-sugar conversion in wood parenchyma of field-growing Laurus nobilis plants: a component of the signal pathway for embolism repair?

Functional Plant Biology : FPB
Sebastiano SalleoMaria A Lo Gullo

Abstract

The ability of stems of Laurus nobilis (L.) to refill embolised xylem conduits was studied in plants both at optimal water supply (W) and under conditions of soil drought inducing xylem pressures (Px) of -1.54 (S1) and -2.35 MPa (S2). Starch depolymerisation in wood parenchyma was measured as percentage of cells 'with high starch content' (HSC-cells) counted under a microscope. HSC-cells decreased during embolism and increased again in refilled stems. A direct relationship was found between percentage of HSC-cells and Px, with HSC-cells between 65 and 75% of the total at Px ≥ -0.6 MPa, at which recovery from PLC was recorded. At low transpiration, starch re-appeared in wood parenchyma cells but only in plants that showed diurnal stomatal opening (W- and S1-plants). In S2-plants showing diurnal stomatal closure and nocturnal opening with Px between -1.2 to -2.4 MPa, HSC-cells were only 25% and plants did not recover from PLC. This finding suggests that (i) the Px threshold for embolism repair was ≥ -0.6 MPa, and (ii) impeded phloem loading limits starch content in wood parenchyma and embolism repair. We conclude that starch depolymerisation acts as a signal to phloem unloading sugars to embolised conduits thus generating the nec...Continue Reading

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Citations

Mar 7, 2013·Journal of Integrative Plant Biology·William J LucasPradeep Kachroo
Apr 25, 2013·Tree Physiology·Frederick C Meinzer, Katherine A McCulloh
Jan 16, 2013·The New Phytologist·José Miguel OlanoVicente Rozas
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Dec 5, 2015·Frontiers in Plant Science·Georg von ArxPatrick Fonti
May 18, 2016·Plant, Cell & Environment·Francesca Secchi, Maciej A Zwieniecki
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May 31, 2018·Journal of Experimental Botany·Silvia TraversariAlessio Giovannelli
May 22, 2019·Ecology and Evolution·Melanie J B ZeppelStephen W Pacala
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Dec 2, 2010·Plant, Cell & Environment·Francesca Secchi, Maciej A Zwieniecki
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Jun 7, 2014·Frontiers in Plant Science·Sonali Sengupta, Arun Lahiri Majumder
Jul 15, 2015·Tree Physiology·Sebastian PfautschMaurizio Mencuccini
Nov 10, 2015·The New Phytologist·Hugh MorrisSteven Jansen
Feb 22, 2017·Nature Plants·Kevin R HultineThomas G Whitham

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