Impact of the colonization of Leifsonia xyli subsp. xyli in a susceptible sugarcane genotype on water status and physiological traits

A - Papers appearing in refereed journals

Garcia, F. H. S., Da Silva Barros, T., Coelho, R. D., Laborde, M. C. F., Azevedo, R. A., Lyra, D. H. and Kluge, R. A. 2021. Impact of the colonization of Leifsonia xyli subsp. xyli in a susceptible sugarcane genotype on water status and physiological traits. European Journal of Plant Pathology. 159 (1), pp. 839-849. https://doi.org/10.1007/s10658-021-02209-8

AuthorsGarcia, F. H. S., Da Silva Barros, T., Coelho, R. D., Laborde, M. C. F., Azevedo, R. A., Lyra, D. H. and Kluge, R. A.
Abstract

Leifsonia xyli subsp. xyli (Lxx) is a pathogenic bacterium that causes Ratoon Stunting Disease (RSD) in the sugarcane crop. Disease symptoms caused by Lxx have been associated with hormonal imbalance, which may be intensified when plants are under water deficit conditions. However, up to date there are no studies showing that Lxx colonization decreases water status in sugarcane. The objective of this study was to evaluate the effect of water status and physiological traits of sugarcane colonized by Lxx under irrigation and water deficit conditions. We inoculated cuttings of the sugarcane genotype CB 49260 with Lxx using four treatments: i) healthy plants fully irrigated, ii) healthy plants under water deficit, iii) plants inoculated with Lxx fully irrigated, and iv) plants inoculated with Lxx under water deficit. Lxx inoculation in sugarcane did not affect relative water content (RWC) in the leaves, independently of the water conditions tested. For gas exchange and fluorescence traits, we did not identify differences between plants inoculated with Lxx and healthy plants. As expected, plants under water deficit conditions decreased RWC, CO2 assimilation, stomatal conductance, transpiration and fluorescence traits, and increased soluble amino acids and proline contents in the leaves. Lxx inoculation increased amino acids and proline contents in plants under water deficit conditions. Therefore, the results indicated that sugarcane colonized with Lxx did not change plant water status independently of the water conditions during the entire growing season.

KeywordsRatoon stunting disease ; Multiple stress; Water deficit; Irrigation ; Photosynthesis; Pathogenic bacteria
Year of Publication2021
JournalEuropean Journal of Plant Pathology
Journal citation159 (1), pp. 839-849
Digital Object Identifier (DOI)https://doi.org/10.1007/s10658-021-02209-8
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Output statusPublished
Publication dates
Online26 Jan 2021
Publication process dates
Accepted19 Jan 2021
PublisherSpringer
ISSN0929-1873

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