Phloem as a possible major determinant of rapid cavitation reversal in stems of Laurus nobilis (laurel)

Functional Plant Biology : FPB
Sebastiano SalleoMaria A Lo Gullo

Abstract

Xylem recovery from embolism was studied in stems of Laurus nobilis L. that were induced to cavitate by combining negative xylem pressures with positive air pressures applied with a pressure collar. Xylem refilling was measured 2 and 20 min and 15 h after air pressure release in January, March and June when increasing percentages of wood parenchyma cells with high starch content (HSC-VAC) were counted (from 0% in January to 87.3% in June). In January, no xylem repair was measured. In June, stems refilled by 75% of previous conductivity loss with a parallel decrease of HSC-VAC. Xylem refilling was tested for stems with phloem either intact or excised by 20 and 50% and with phloem inactivated by girdling stems at both sides of the embolised segment. Stems with 50% of the cortex removed showed some recovery 15 h after embolism. Girdled stems did not recover from embolism and no starch depolymerisation was measured. Girdled stems where a radial mechanical pressure was applied for 20 min after embolism refilled in the same way as stems with intact phloem. Our conclusion is that phloem may export some signal for starch depolymerisation and this, in turn, would drive sugar efflux into embolised conduits with consequent osmotic water f...Continue Reading

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Citations

Feb 10, 2011·PloS One·Elisabeth M R RobertNico Koedam
Mar 7, 2013·Journal of Integrative Plant Biology·William J LucasPradeep Kachroo
Dec 5, 2015·Frontiers in Plant Science·Georg von ArxPatrick Fonti
Jun 1, 2008·Functional Plant Biology : FPB·Sebastiano SalleoMaria Assunta Lo Gullo
Feb 21, 2008·Plant, Cell & Environment·Andrea NardiniSebastiano Salleo
Mar 19, 2008·Physiologia Plantarum·Andrea NardiniSebastiano Salleo
Apr 12, 2011·Annals of Botany·Veerle De Schepper, Kathy Steppe
Jul 6, 2016·Frontiers in Plant Science·Barbara BeikircherStefan Mayr
Dec 2, 2010·Plant, Cell & Environment·Francesca Secchi, Maciej A Zwieniecki
Feb 13, 2016·Frontiers in Plant Science·Kimberly O'KeefeAnthony M Swemmer
Feb 9, 2013·Annals of Botany·Christian TötzkeAnita Roth-Nebelsick
Dec 1, 2014·Functional Plant Biology : FPB·Sergio TombesiTheodore M DeJong
Jun 1, 2017·Functional Plant Biology : FPB·Barbara Beikircher, Stefan Mayr
Dec 28, 2019·International Journal of Molecular Sciences·Martina TomasellaValentino Casolo
Sep 18, 2015·Tree Physiology·Tom De SwaefKathy Steppe
Mar 16, 2017·Journal of Integrative Plant Biology·Martin D VenturasUwe G Hacke
Dec 14, 2011·The New Phytologist·Mairgareth A ChristmanDuncan D Smith
Jul 3, 2021·Plants·Aleksandra SłupianekKatarzyna Sokołowska

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