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      Importance of temperature in evaluating cotton for resistance to Fusarium wilt caused by Fusarium oxysporum f. sp. vasinfectum race 4

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          Quantitative Disease Resistance under Elevated Temperature: Genetic Basis of New Resistance Mechanisms to Ralstonia solanacearum

          In the context of climate warming, plants will be facing an increased risk of epidemics as well as the emergence of new highly aggressive pathogen species. Although a permanent increase of temperature strongly affects plant immunity, the underlying molecular mechanisms involved are still poorly characterized. In this study, we aimed to uncover the genetic bases of resistance mechanisms that are efficient at elevated temperature to the Ralstonia solanacearum species complex (RSSC), one of the most harmful phytobacteria causing bacterial wilt. To start the identification of quantitative trait loci (QTLs) associated with natural variation of response to R. solanacearum, we adopted a genome wide association (GWA) mapping approach using 176 worldwide natural accessions of Arabidopsis thaliana inoculated with the R. solanacearum GMI1000 strain. Following two different procedures of root-inoculation (root apparatus cut vs. uncut), plants were grown either at 27 or 30°C, with the latter temperature mimicking a permanent increase in temperature. At 27°C, the RPS4/RRS1-R locus was the main QTL of resistance detected regardless of the method of inoculation used. This highlights the power of GWA mapping to identify functionally important loci for resistance to the GMI1000 strain. At 30°C, although most of the accessions developed wilting symptoms, we identified several QTLs that were specific to the inoculation method used. We focused on a QTL region associated with response to the GMI1000 strain in the early stages of infection and, by adopting a reverse genetic approach, we functionally validated the involvement of a strictosidine synthase-like 4 (SSL4) protein that shares structural similarities with animal proteins known to play a role in animal immunity.
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            American, Egyptian, and Indian cotton‐wilt Fusaria: Their pathogenicity and relationship to other wilt Fusaria

            (2025)
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              Author and article information

              Contributors
              Journal
              Crop Science
              Crop Science
              Wiley
              0011-183X
              1435-0653
              May 2021
              March 14 2021
              May 2021
              : 61
              : 3
              : 1783-1796
              Affiliations
              [1 ]Dep. of Plant and Environmental Sciences New Mexico State Univ. Las Cruces NM 88003 USA
              [2 ]Texas A&M AgriLife Research 1102 E. Drew St. Lubbock TX 79403 USA
              [3 ]Cotton Incorporated Cary NC 27513 USA
              Article
              10.1002/csc2.20446
              1bdc1784-e8db-42e5-bc63-88c3652bf4d8
              © 2021

              http://onlinelibrary.wiley.com/termsAndConditions#vor

              http://doi.wiley.com/10.1002/tdm_license_1.1

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