Impairment of leaf hydraulics in young plants of Citrus aurantium (sour orange) infected by Phoma tracheiphila

Functional Plant Biology : FPB
Fabio RaimondoM A Lo Gullo

Abstract

Phoma trachephila (Petri) Kantschaveli et Gikachvili causes dieback of several Citrus species. The impact of this fungus on leaf hydraulics was studied in Citrus aurantium L. (sour orange) with the aim of identifying the primary mechanism of damage to leaves. Leaves inoculated with a conidial suspension were measured for conductance to water vapor (gL) and specific hydraulic conductance (Kleaf) every 3 days after inoculation. The earliest symptom of infection consisted of vein chlorosis. Functional vein density (FVD) was monitored and microscopic observations were made of major vein conduits. Impairment of vein hydraulics started 25 days after inoculation with a losses of Kleaf of 40% and gL of ~60%. Most minor veins within chlorotic areas were no longer functioning and some conduits of the major veins showed digested interconduit pits leading to vein cavitation. The close Kleaf-FVD relationship revealed that vein impairment caused drop of Kleaf and, consequently, of gL at chlorotic areas. Leaf infection was focused to veins that were first forced to embolise and then invaded by fungal hyphae. The vein embolism due to the Phoma amplifies the native dominant hydraulic resistance of leaf veins, and leads ultimately to early shedd...Continue Reading

References

Nov 10, 2001·Annual Review of Phytopathology·G De LorenzoF Cervone
May 25, 2002·Molecular Plant-microbe Interactions : MPMI·Vincenzo FoglianoMatteo Lorito
Aug 16, 2002·Current Opinion in Plant Biology·Giulia De Lorenzo, Simone Ferrari
Oct 16, 2002·Journal of Experimental Botany·Lawren SackN Michele Holbrook
Sep 25, 2003·Journal of Experimental Botany·Patrizia TrifilòSebastiano Salleo
Apr 6, 2004·Trends in Plant Science·Sonja VorwerkChris Somerville
Apr 6, 2004·Plant Physiology·Lawren SackN Michele Holbrook
Feb 3, 2005·Tree Physiology·Maria A Lo GulloSebastiano Salleo
May 4, 2006·Annual Review of Plant Biology·Lawren Sack, N Michele Holbrook
Dec 1, 2004·Functional Plant Biology : FPB·Antonio GascóSebastiano Salleo

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Citations

Feb 21, 2008·Plant, Cell & Environment·Andrea NardiniSebastiano Salleo
Dec 10, 2013·Tree Physiology·Fabio RaimondoMaria A Lo Gullo
Sep 1, 2009·Plant Disease·Quirico MigheliGaetano Magnano di San Lio

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