Lovisolo, Claudio

Italian

Institutional Research Information System University of Turin

08 January 2022AperTO - Archivio Istituzionale Open Access dell'Università di TorinoOriginal Citation:Comportamento ecofisiologico di piante affette da Flavescenza Dorata (FD)Terms of use:Open Access(Article begins on next page)Anyone can freely access the full text of works made available as "Open Access". Works made available under aCreative Commons license can be used according to the terms and conditions of said license. Use of all other worksrequires consent of the right holder (author or publisher) if not exempted from copyright protection by the applicable law.Availability:This is the author's manuscriptThis version is available http://hdl.handle.net/2318/1568122 since 2016-06-20T11:15:59ZFlavescence dorée phytoplasma deregulates stomatal control of photosynthesis in Vitis vinifera Annals of Applied Biology 162: 335-346 (2013) Marco Vitali, Walter Chitarra, Luciana Galetto, Domenico Bosco, Christina Marzachì, Maria Lodovica Gullino, Federico Spanna and Claudio Lovisolo  Finanziamento Masgrape, Regione Piemonte Claudio Lovisolo - (UNITO - DISAFA) Comportamento ecofisiologico di piante di vite affette da FD Introduction Aim: To highlight which mechanism controls leaf to atmosphere gas exchange during FD infection and recovery  Introduction: Ø Flavescence dorée (FD) is caused by the 16SrV-C, -D, ‘Candidatus Phytoplasma vitis’ (non-culturable plant-pathogenic prokariotes) Ø Phytoplasmas are transmitted by a vector (Scaphoideus titanus B.) Ø Symptoms: yellowing or reddening of the leaves (no photosynthesis), stunting, downward leaf rolling, shortening of internodes, bunch shriveling, and general decline that may result in plant death. Do symptoms take place after the block of phloem transport? Note that: Ø   FD-infected vines may show a spontaneous remission of symptoms (Recovery, REC)  Ø Different susceptibility among cultivars Materials and Methods Ø Measurements performed on 2 vineyards: Barbera and Nebbiolo Ø Plant physiology monitored by a portable gas exchange and fluorescence system.  Ø Four groups of plants were monitored (diagnosis were performed by Entomologists at University and CNR): - Healthy (PCR negative) - FD-infected (FD) (PCR positive) - Recovery (REC1) plants infected in the previous year (PCR negative) - Recovery 2 (REC2) plants infected two years before (PCR negative)    2008 2009 2010 ‘Barbera’ healthy 12 12 12+3* FD 12 7 5+3* REC1 5 2 REC2 5 Tot 24 24 30 ‘Nebbiolo’ healthy 10 10 10 FD 10 9 7 REC1 1 2 REC2 1 Tot 20 20 20 Population of plants used for eco-physiological measurement ‘Barbera’ 2008 2009 2010 2011 FD 100% (n=13) 100% (n=11) 100% (n=70) REC1 61.5 % (n=8) 54.5% (n=6) 51.4% (n=36) REC2 75 % (n=6) 83.3% (n=5)  ‘Nebbiolo’ 2008 2009 2010 2011 FD 100% (n=13) 100% (n=11) 100% (n=13)   REC1  23.1% (n=3) 9%  (n=1) 30.7% (n=4) REC2  33.3% (n=1) 100% (n=1) *=three plants were added in 2010 In brackets the number of plants Recovery percentage in the four experimental years in the two vineyards 53% 46% 8% 22%   Results Results Well watered Water stress NPQ = non-photochemical quenching Rate of heat loss from PSII g s (mol H2O m-2 s-1)   ci (ppm)  WS Results Soil  Water  Pn  Light  Temperature  Humidity  ci  E  gs  Rainfall  ü  Dis ase slows down Calvin cycle with a consequent rise in ci à metabolic leaf gas exchange limitation and photo-damages;  ü   Barbera shows higher susceptibility to FD than Nebbiolo plants, associated with a detrimental effect on physiological performances recorded; ü  Different attitudes to recovery from FD between the cultivars  ü The REC2 status corresponded to a stable remission of symptoms  Conclusions 

Comportamento ecofisiologico di piante affette da Flavescenza Dorata (FD)

https://iris.unito.it/bitstream/2318/1568122/1/02lovisolo.pdf

Comportamento ecofisiologico di piante affette da Flavescenza Dorata (FD)

Abstract

Similar works

Full text

Available Versions

Institutional Research Information System University of Turin