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Article

Leaf vs. Whole-Plant Biotic Attack: Does Vine Physiological Response Change?

1
Department of Integrative Biology and Biodiversity Research, Institute of Botany, University of Natural Resources and Life Sciences, Vienna (BOKU), Gregor-Mendel-Straße 33, 1180 Vienna, Austria
2
Department of Crop Sciences, Institute of Viticulture and Pomology, University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad Lorenz Strasse 24, A-3430 Tulln, Austria
*
Author to whom correspondence should be addressed.
Academic Editors: Guido D’Urso and Teresa Afonso do Paço
Water 2021, 13(10), 1429; https://doi.org/10.3390/w13101429
Received: 20 April 2021 / Revised: 9 May 2021 / Accepted: 17 May 2021 / Published: 20 May 2021
Phylloxera is one of the most invasive and widespread insects in viticulture. An increase in populations feeding on leaves and/or roots of formeR + Ly resistant grapevines has been observed, but information on leaf and whole plant phylloxera infestation effects is lacking. We monitored the water and carbon metabolism of vines (one rootstock x scion combination) inoculated with insects’ eggs on leaves (L) or both leaves and roots (R+L). Nonstructural carbohydrates (NSC) in infested and noninfested tissue of different organs and plant biomass were measured at the end of the experiment. At the peak of the biotic stress treatment, the plants reduced transpiration by about 30% compared to control, while photosynthesis remained unaffected. Lower soluble NSC were measured in infested than in the nearby noninfested tissue of both L and R+L groups, suggesting sugar consumption by the insect, while infested roots increased starch content by fivefold. NSC were depleted in noninfested roots of R+L plants as well, giving strength to the hypothesis of intense metabolites translocation in favor of the insect. A more distinct physiological depression in R+L vines compared to L was highlighted, even if the total biomass reduction was more marked in L plants. Our preliminary results suggest that the insect reprograms plant metabolism stimulating a more conservative water use, while competing with the host plant for carbon resources. Further studies should validate current results and quantify the NSC invested in the plant’s defense against the pest. View Full-Text
Keywords: phylloxera; gas exchange; NSC; grapevine; source–sink relationship; Kober 5BB phylloxera; gas exchange; NSC; grapevine; source–sink relationship; Kober 5BB
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MDPI and ACS Style

Savi, T.; Herrera, J.C.+.L.; Forneck, A. Leaf vs. Whole-Plant Biotic Attack: Does Vine Physiological Response Change? Water 2021, 13, 1429. https://doi.org/10.3390/w13101429

AMA Style

Savi T, Herrera JC+L, Forneck A. Leaf vs. Whole-Plant Biotic Attack: Does Vine Physiological Response Change? Water. 2021; 13(10):1429. https://doi.org/10.3390/w13101429

Chicago/Turabian Style

Savi, Tadeja, Jose C.+.L. Herrera, and Astrid Forneck. 2021. "Leaf vs. Whole-Plant Biotic Attack: Does Vine Physiological Response Change?" Water 13, no. 10: 1429. https://doi.org/10.3390/w13101429

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