Defense responses against the sorghum anthracnose pathogen in leaf blade and midrib tissue of johnsongrass and sorghum

Ahn, Ezekiel; Prom, Louis K.; Odvody, G. N.; Magill, Clint

doi:10.1016/j.pmpp.2018.12.008

Cited by 14 publications

(29 citation statements)

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“…It is reported that even though the Johnsongrass cultivars showed signs of induced defense response following greenhouse spray inoculations with FSP53, pathogen reproduction was never successful in terms of appressorium production with one exception, but differential responses were detected using an excised leaf assay 5 . FSP35 infected all twenty-six cultivars tested with high pathogenicity scores with little variability, resulting in no correlation for FSP35 versus pathogenicity level 5,6 . Conversely, Spearman's correlation test for leaf midrib thickness and pathogenicity level revealed a strong negative correlation of nearly − 0.70 in most cases.…”

Section: Discussionmentioning

confidence: 96%

“…SH1450 has the highest mean basal leaf angle among all samples, while SH1201 has the smallest mean basal leaf angle with 23 Basal leaf angle distribution is weakly correlated to Johnsongrass responses to Colletotrichum sublineola. Basal leaf angle was plotted versus mean pathogenicity level to three C. sublineola isolates that vary in virulence 5,6 . Both parametric (Pearson's correlation) and nonparametric (Spearman's rank correlation) tests were performed.…”

Section: Mean Basal Leaf Angle Distribution Statistically Differed Ammentioning

confidence: 99%

“…www.nature.com/scientificreports/ Excised-leaf spot inoculation. Disease ratings for the 21 Johnsongrass cultivars used in the leaf angle study were available from a prior study 6 . In that study, 26-cultivars of Johnsongrass from different U.S. locations were inoculated near the end of vegetative stage with three isolates of C. sublineola from sorghum by using the excised leaf assay as described by Prom et al 7 .…”

Section: Measurements Leaf Angle Distribution At Booting Stage Basmentioning

confidence: 99%

“…C. sublineola causes anthracnose on leaf and stalk of sorghum 4 . Due to the genetic similarity between Johnsongrass and sorghum, it was hypothesized that Johnsongrass is a reservoir for C. sublineola , and cross-infection of C. sublineola was tested in a previous study between sorghum and Johnsongrass 5 , 6 . In those studies, 26-cultivars of Johnsongrass from different U.S. locations were inoculated at the 8-leaf-stage with three isolates of C. sublineola from sorghum by using an excised leaf assay 7 .…”

Section: Introductionmentioning

confidence: 99%

“…Ahn et al inoculated C. sublineola to Johnsongrass and confirmed that Johnsongrass can be infected with Prom et al’s excised leaf assay 5 . Furthermore, it has been identified that midrib was more resistant to the pathogen compared to leaf blade in some sorghum and Johnsongrass lines 6 . In Johnsongrass, pathogenicity level varied among isolates and cultivars as measured on a five-point Likert scale ranging from resistant without visible fungal infection, to susceptible with formation of visible countless acervuli 6 .…”

Section: Introductionmentioning

confidence: 99%

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Leaf angle distribution in Johnsongrass, leaf thickness in sorghum and Johnsongrass, and association with response to Colletotrichum sublineola

Ahn

Odvody

Prom

et al. 2020

Sci Rep

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Basal leaf angle distribution was surveyed in twenty-one Johnsongrass cultivars near the end of the vegetative stage. The angles increased from the top to the bottom leaves, and compared to cultivated grain sorghums, the average angle was larger in Johnsongrass. When basal leaf angle distribution data were correlated with pathogenicity test data from excised-leaf assays for three isolates of Colletotrichum sublineola, the results showed a weak positive correlation between basal leaf angle and pathogenicity level in Johnsongrass. In order to investigate a protective role of leaf thickness to C. sublineola, leaf thickness was measured in three sorghum cultivars and one Johnsongrass cultivar at the 8-leaf-stage. Leaf thickness near the apex, near the base, and half-way between the two points were measured in the top four leaves of each plant. Thickness of leaf blade and midrib were recorded separately. Using an excised-leaf-assay, the three points were inoculated with C. sublineola, and pathogenicity level was recorded 4-days-post-inoculation. Results showed strong negative correlations between leaf midrib thickness and pathogenicity level in sorghum and Johnsongrass but not in leaf blades.

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Section: Discussionmentioning

confidence: 96%