Plant Pathol J > Volume 35(4); 2019 > Article
Perlikowski, Wiśniewska, Góral, Ochodzki, Majka, Pawłowicz, Belter, and Kosmala: Identification of Proteomic Components Associated with Resistance to Fusarium Head Blight in Rye


Rye was used here to dissect molecular mechanisms of resistance to Fusarium head blight (FHB) and to go deeper with our understanding of that process in cereals. F. culmorum-damaged kernels of two lines different in their potential of resistance to FHB were analyzed using two-dimensional gel electrophoresis and mass spectrometry to identify resistance markers. The proteome profiling was accompanied by measurements of α- and β-amylase activities and mycotoxin content. The proteomic studies indicated a total of 18 spots with clear differences in protein abundance between the more resistant and more susceptible rye lines after infection. Eight proteins were involved in carbohydrate metabolism of which six proteins showed a significantly higher abundance in the resistant line. The other proteins recognized here were involved in stress response and redox homeostasis. Three remaining proteins were associated with protease inhibition/resistance and lignin biosynthesis, revealing higher accumulation levels in the susceptible rye line. After inoculation, the activities of α- and β-amylases, higher in the susceptible line, were probably responsible for a higher level of starch decomposition after infection and a higher susceptibility to FHB. The presented results could be a good reference for further research to improve crop resistance to FHB.

The important cereals, including wheat (Triticum aestivum L.), barley (Hordeum vulgare L.), oat (Avena sativa L.), triticale (xTriticosecale Wittm.) and rye (Secale cereale L.), cultivated in different climatic zones, can suffer from Fusarium head blight (FHB). The disease is caused by numerous fungal pathogens that belong to the Fusarium genus (Bottalico, 1998; Bottalico and Perrone, 2002; Kiecana and Mielniczuk, 2010; Muthomi et al., 2008; Šrobárová et al., 2008). In small-grain cereals, ca. 20 different Fusarium species are thought to be associated with FHB symptoms (Gerlach and Nirenberg, 1982). These fungal species attack cereals in a wide range of environmental conditions. Warmer areas are dominated by F. graminearum and cold areas by F. avenaceum while F. culmorum occupies the intermediate temperature range (Bottalico and Perrone, 2002; Parry et al., 1995; Xu et al., 2005). In Poland and Germany, FHB in rye is caused primarily by F. culmorum, F. graminearum and Microdochium nivale differentiated from Fusarium genus (Kiecana and Mielniczuk, 2010; Lees et al., 1995; Miedaner et al. 2001, 2003).
The fungal infection of plant heads and kernels results both in significant reductions of a grain yield and the contamination with Fusarium toxic metabolites which influence human and livestock health (Desjardins, 2006; Pirgozliev et al., 2003). The disease symptoms are mainly the result of contamination of Fusarium-damaged kernels (FDK) with such compounds as zearalenone (ZEN) and trichothecene B toxins, namely nivalenol (NIV) and deoxynivalenol (DON) (Bottalico and Perrone, 2002; Buerstmayr et al., 2009; Chakraborty et al., 2006; Marin et al., 2013).
The selection of plants with high resistance to FHB is difficult since this is regulated both by the genes of host plant and pathogen, and also by external, environmental conditions (Chełkowski et al., 2000; Cowger et al., 2009; Mesterházy, 1995; Miedaner, 1997; Snijders, 2004). In our previous work, we found that some important cellular components of wheat (Perlikowski et al., 2014) and triticale (Perlikowski et al., 2016) are associated with resistance to FHB. Although Langevin et al. (2004) demonstrated that rye is less susceptible to infections of Fusarium species compared to wheat and triticale, rye can also suffer significantly from FHB. Thus, the work performed here is required to complete the comprehensive research and to draw a more comprehensive model of resistance mechanisms in cereals.
The application of proteomic tools has proved to be a valuable strategy to recognize numerous cellular mechanisms involved in the resistance to a broad range of environmental stresses, abiotic and biotic, in different plant species (e.g. Kosmala et al., 2009, 2012; Perlikowski et al., 2014, 2016). In this paper for the first time, we reported the research on rye, involving the analysis of protein accumulation profiles in the FDK of two plant groups, more resistant and more susceptible lines to FHB. The proteome profiling in the analyzed kernels, was complemented by α- and β-amylase activity assays, the evaluation of pathogen content and the accumulation level of DON.

Material and Methods

Plant material and field experiments

The details associated with field experiments, including fungal material and analysis of plant resistance components were similar to those described previously for wheat (Perlikowski et al., 2014) and triticale (Perlikowski et al., 2016).
Two Polish cultivars of rye, Tur and Horyzo, were used in this research. Their levels of resistance were evaluated under the field conditions in 2016, in two locations: Radzików (central Poland; GPS coordinates: N 52.211754, E 20.631954) with rich, sandy-clay soil and Cerekwica (western Poland; GPS coordinates: N 52.521012, E 16.692005) with poor, sandy-clay soil. The pathogen material was a mixture of three isolates of F. culmorum (W.G. Sacc.): KF 846 (DON chemotype), KF 350 (NIV chemotype) and ZFR 112 (ZEN type) (Góral et al., 2019). Equal volumes of conidial suspensions of these three isolates were mixed (Góral et al., 2016). The flowering rye heads (65 ZGS) were inoculated by spraying with the spore suspension at a rate of approximately 100 ml/m2. Conidia concentration was adjusted to 5 × 104 conidia/ml. The experiments in both locations were performed using the same design and all the details were described precisely in our earlier studies on wheat (Perlikowski at al., 2014) and triticale (Perlikowski et al., 2016). The FHB index (FHBi) was calculated according to the formula: FHBi (%) = (% of head infection × % of heads infected per plot)/100, as described precisely earlier (Perlikowski at al., 2014).

Pathogen biomass and mycotoxin content

The pathogen biomass and the level of deoxynivalenol accumulation in the kernels of the R (with a higher resistance) and the S (with a lower resistance) rye lines were evaluated as described in detail by Perlikowski et al. (2016).

Proteome profiling and identification of differentially accumulated proteins

The plants from Cerekwica were applied into the proteomic research using two-dimensional gel electrophoresis (2-DE) and mass spectrometry (MS). The FDK derived from 20 heads were pooled, separately for each inoculated plot, giving three separate pooled samples (bulk flour) for each analyzed line, the R and the S. The kernels derived from 20 heads of the control plot were also pooled for each analyzed line. The pooled samples (bulk flour) were used for proteomic research - each one in three technical replicates. The proteomic protocol was the same as that described in detail by Perlikowski et al. (2014, 2016). The proteins were resolved in the pH range = 4-7 during isoelectrophocusing, followed by SDS-PAGE, coomassie brilliant blue staining and ImageMaster 2-D Platinum 6.0 (GE Healthcare) processing. The presented here raw 2-D images cannot reveal protein abundance for comparisons. To compensate for differences in sample loading, gel staining and destaining, the abundance of each protein spot was normalized as a relative volume (% Vol). The % Vol of each spot was automatically calculated by Image Master software as a ratio of the volume of particular detected spot to the total volume of all the spots marked on the gel. This procedure has been applied in our numerous previous experiments focused on the resistance of plants to biotic (e.g. Perlikowski et al., 2014, 2016) and abiotic stresses (e.g. Augustyniak et al., 2018). The protein identification in the selected spots was performed in the Mass Spectrometry Lab, Institute of Biochemistry and Biophysics, Polish Academy of Sciences (Warsaw, Poland). The identified proteins were grouped according to UniProt categories (

α- and β-amylase activity assays

α-amylase and β-amylase activities in rye FDKs were tested using the Ceralpha α-Amylase Assay Kit and the “Betamyl-3® method” Assay Kit (Megazyme International Ireland Inc., Bray, Ireland), respectively, as described in our earlier work on triticale (Perlikowski et al., 2016).

Results and Discussion

Field experiments and DON analysis

Herein, the mixture of three Fusarium isolates was used. This mixture was applied in our numerous experiments and it was proved to be efficient also in uncomfortable environmental conditions to develop the symptoms of Fusarium head blight in different cereal species (e.g. Perlikowki et al., 2014, 2016). The presented studies revealed that Fusarium head infection of both analyzed here rye cultivars was relatively low (Table 1). This phenomenon was supported by earlier reports, suggesting that rye is one of the most resistant species among the other cereals (Langevin et al., 2004). Thus rye could be a good source of genes governing resistance to FHB to be transferred to susceptible plants, as we proved for wheat-triticale (Perlikowski et al., 2014, 2016) and could also be the strongest model for resistance. However, the selection of rye individuals with distinct levels of resistance is required to dissect the resistance to FHB into its particular components. The difference in FHB index (associated with type I and type II resistance) was not statistically significant, although higher for the S line compared to the R line. Furthermore, as we demonstrated in Table 1, FHBi observed for both field locations (Cerekwica and Radzikow) was also different. This phenomenon was probably due to the different levels of rainfall and temperature in both locations (Supplementary Table 1). However, that important aspect was not analyzed here in details and requires further research. The analyzed rye lines were also significantly different with respect to mycotoxin amounts in the kernels in Cerekwica (Table 1), and these relationships were similar to those observed earlier in our research on triticale (Perlikowski et al., 2016). However, as indicated in Table 2, the R and S lines did not differ significantly in the pathogen biomass of the analyzed kernels (a slightly lower fungus biomass was revealed after inoculation in the R line but this evaluation was not statistically significant). We clearly showed that fungal activity was higher in the more susceptible rye genotypes, at least with respect to DON production. And finally, this phenomenon resulted in significant differences in both numbers and weights of Fusarium damaged kernels observed between the analyzed populations. Interestingly, in triticale, these components of resistance were strongly associated with Fusarium biomass content in the analyzed kernels (Perlikowski et al., 2016), stressing the importance of species specific response to environmental stresses. We hypothesize that significant, albeit subtle, differences in the resistance components identified in the two lines analyzed here could follow crucial alterations in rye cellular proteome in the controlled conditions and after inoculation. These traits make the R and the S rye lines excellent and unique models to go deeper in our understanding of resistance to FHB in cereals. Furthermore, the field experiments with wheat (in 2013), triticale (in 2014), and with rye (in 2016), were performed exactly in the same locations but in different years. The environmental conditions were monitored, thus enabling the comparisons between the particular years and the analyzed species with respect to alterations in plant metabolism after infections with the same pathogen materials. However, since such a study does not fall into the scope of this paper, we reserve it for later.

Proteome profiling and identification of differentially accumulated proteins

As clear differences with respect to the level of resistance between the analyzed lines were observed in Cerekwica, the plants grown in that location were selected for proteomic work. The accumulation levels of particular proteins could be good indicators of cellular metabolism, even more informative, compared to the corresponding gene activities evaluated at transcript levels. The proteomic experiments demonstrated a total of 18 spots with significant differences in protein accumulation profiles between the analyzed rye lines after infection (Fig. 1 and Supplementary Fig. 1), including 11 spots with significantly higher protein accumulation levels in the R rye line (spots no. 2, 4, 6-8, and 10-15), and seven spots with significantly higher protein accumulation levels in the S line (spots no. 1, 3, 5, 9, and 16-18). Fourteen proteins were successfully identified using MS approach, whereas four proteins remained unrecognized (spots no. 1, 12-13 and 17). A majority of the identified proteins were shown to be the homologs of proteins from related plant species (Table 3). Eight proteins were revealed to be involved in a cellular carbohydrate metabolism (spots no. 2-4, 6-8, 11, and 16) with six proteins showing a significantly higher abundance in the R rye line (Supplementary Fig. 1, Table 3). The importance of carbohydrate metabolism with respect to FHB was revealed also in our earlier work performed on triticale (Perlikowski et al., 2016). The remaining proteins recognized here were demonstrated to be involved in stress response (spots no. 14-15) and redox homeostasis (spot no. 10), both types of proteins showing higher abundance after infection in the R line; three other proteins were confirmed to be associated with protease inhibition/resistance (spots no. 5 and 18) and lignin biosynthesis (spot no. 9), revealing higher accumulation levels in the S line (Supplementary Fig. 1, Table 3).
Previously, we proved the involvements of different types of amylases into the mechanisms of resistance to FHB and the interactions between plants and fungi in wheat and triticale (Perlikowski et al., 2014, 2016). Here, in Fusarium damaged kernels, a significantly higher abundance of cereal-type of amylase inhibitor was revealed for the S line both at control conditions and after infection (Supplementary Fig. 1). Therefore, a more detailed research on α- and β-amylase activities were also performed.

α- and β-amylase activity

Both rye lines did not reveal any significant differences with respect to α-amylase activities in the control conditions. On the other hand, after inoculation, the α-amylase activities increased significantly in both rye lines, with slightly higher values in the S line (Fig. 2A). This pattern of α-amylase activity shown here for rye was quite similar to those published earlier for wheat (Perlikowski et al., 2014) and triticale (Perlikowski et al., 2016), stressing the importance of this enzyme performance in the mechanism of resistance to FHB in cereals. Interestingly, there was a higher accumulation of cereal-type amylase inhibitor (by combined 2 D and MS analysis) in the S line. Although amylase activity seems to not correlate with the inhibitor levels, the inhibitor could still be important for pathogensis. The activities of β-amylase were similar before and after inoculation in each analyzed rye line, however, both in the case of HLK and FDK, these activities were higher in the S line (Fig. 2B). Thus, FDK of S rye line showed significantly higher activities of both amylase types, α- and β-. It has been demonstrated that Fusarium pathogens can use their own hydrolytic enzymes or the enzymes derived from plants to colonize cereal kernels (Wang et al., 2005). This phenomenon was probably responsible, at least partially, for a higher level of starch decomposition after inoculation and higher susceptibility to FHB in the S rye line. On the other hand, a lower level of starch decomposition in the R rye line did not prevent Fusarium biomass expansion in kernels but reduced significantly its vitality and metabolism. Although, plant and fungal α-amylase activities could not be distinguished here, it is highly probable that the amylase activity had its source in both organisms.


A set of comprehensive experiments which have been performed recently on wheat (Perlikowski et al., 2014), triticale (Perlikowski et al., 2016), and rye (herein) resulted in a model of resistance to FHB in these cereal species involving crucial components of plant metabolism associated with the stability of kernel storage sugars after Fusarium infection. It has been clearly demonstrated that a higher amylase activity and subsequent starch decomposition were the crucial attributes of higher susceptibility to kernel damage caused by Fusarium in the analyzed cereals. Furthermore, triticale and rye with a lower amylase activities after inoculation were consequently characterized by a lower mycotoxin content in the kernels. However, the correlation between the amylase activities and the susceptibility of rye to Fusarium was not as strong as in the case of wheat and triticale. The presented results could be a good reference for further more applied research to improve crop resistance to FHB.

Supplemental Materials


The study was supported by the Polish Ministry of Agriculture and Rural Development (HORhn - 801 - PB - 9/16 no. 14, 2016). The equipment used for MS was sponsored in part by the Centre for Preclinical Research and Technology (CePT), a project co-sponsored by European Regional Development Fund and Innovative Economy, The National Cohesion Strategy of Poland. Dawid Perlikowski was a scholarshipholder of the Fundation for Polish Science (FNP).

Fig. 1
The single representative 2-DE protein maps of rye kernels in the control conditions (C) and after Fusarium culmorum infection (FDK - Fusarium-damaged kernels) 2-dimensional electrophoresis for the line more resistant (R) and more susceptible (S) to Fusarium head blight. The spots with differentially accumulated (P ≤ 0.05) proteins (1-18) between both analyzed lines, are numbered.
Fig. 2
Comparison of α-amylase (A) and β-amylase (B) activity in the kernels of rye S (line more susceptible to Fusarium head blight) and R (line more resistant to Fusarium head blight) after Fusarium culmorum infection (FDK - Fusarium-damaged kernels) and in control conditions (HLK - healthy looking kernels). The enzyme activity was expressed in Ceralpha Units (CU) per gram of flour. The means of three biological replicates and standard deviation bars are shown. Values marked with the same letter did not differ at a significance level of 0.05 (Fisher’s LSD-test).
Table 1
The components of the resistance to Fusarium head blight in the more resistant (R) and more susceptible (S) rye lines and their yields under control conditions
Rye lines Location Conditions after inoculation Control conditions

FHBi % FDK (weight [g]) % FDK (number) Total kernel number/head Total kernel weight [g]/head DON [mg/kg] Total kernel number/head Total kernel weight [g]/head
R (TUR) Cerekwica 8.0 (±1.41) a 10.5 (±0.73) b 15.7 (±3.53) b 49.1 (±17.91) 1.96 (±0.49) 4.75 (±0.25) b 50.0 2.82
S (HORYZO) 9.0 (±1.41) a 20.9 (±3.18) a 28.2 (±5.22) a 49.1 (±13.63) 2.17 (±0.40) 6.82 (±0.81) a 54.3 2.98

R (TUR) Radzików 11.7 (±5.51) a 8.8 (±7.19) b 9.6 (±7.10) b 52.8 (±0.58) 2.58 (±0.17) 3.86 (±0.44) b 53.7 2.79
S (HORYZO) 14.0 (±3.46) a 11.1 (±0.50) b 12.4 (±0.70) b 48.6 (±1.50) 2.56 (±0.11) 4.69 (±1.81) b 52.6 2.81

FHBi - Fusarium head blight index, FDK - Fusarium-damaged kernels, R - more resistant line, S - more susceptible line; mean values and standard deviations of each parameter calculated after inoculation (three plots) and data from one plot calculated for the control conditions, are shown. Values marked with the same letter did not differ at a significance level of 0.05 (Fisher’s LSD-test).

Table 2
Fusarium culmorum biomass in the kernels of more resistant (R) and more susceptible (S) rye lines [mg/g]
Rye lines Conditions after inoculation Control conditions
R (TUR) 9.59668 (±1.12) b 0.735388 a
S (HORYZO) 11.09539 (±1.07) b 0.781604 a

R - more resistant line, S - more susceptible line; mean values and standard errors of each parameter calculated after inoculation (three plots) and data from one plot calculated for the control conditions, are shown. Values marked with the same letter did not differ at a significance level of 0.05 (Fisher’s LSD-test).

Table 3
The results of MS analysis performed on the spots that showed at least a 2.0 ratio (P ≤ 0.05) in protein abundance between the more resistant and more susceptible rye lines
Spot no.1 Accession2 Identified protein3 Score4 Coverage (%)5 No. of peptide matched Molecular function6
1 BAK03012 predicted protein [Hordeum vulgare subsp. vulgare]
blastp: not identified
338 15 5 -
2 XP_020150703 pyrophosphate--fructose 6-phosphate 1-phosphotransferase, subunit beta-like [Aegilops tauschii subsp. tauschii] 1117 29 15 carbohydrate metabolism
3 BAJ85279 predicted protein [Hordeum vulgare subsp. vulgare]
blastp: enolase [Aegilops tauschii subsp. tauschii]
1493 48 17 carbohydrate metabolism
4 ANW11921 glyceraldehyde-3-phosphate dehydrogenase [Triticum aestivum] 745 34 12 carbohydrate metabolism
5 ACN59484 serpin 2 [Triticum aestivum] 403 13 6 protease inhibition (resistance)
6 ACO44683 fructose-bisphosphate aldolase [Secale cereale] 900 38 12 carbohydrate metabolism
7 EMS58841 fructose-bisphosphate aldolase [Triticum urartu] 806 35 10 carbohydrate metabolism
8 ACQ57333 cytosolic malate dehydrogenase [Triticum aestivum] 1528 61 17 carbohydrate metabolism
9 BAD06321 putative caffeoyl CoA O-methyltransferase [Triticum aestivum] 375 22 6 lignin biosynthesis (resistance)
10 XP_020172398 1-Cys peroxiredoxin PER1 [Aegilops tauschii subsp. tauschii] 376 22 6 redox homeostasis
11 P46226 triosephosphate isomerase [Secale cereale] 1071 52 11 carbohydrate metabolism
12 BAK03707 predicted protein [Hordeum vulgare subsp. vulgare]
blastp: uncharacterized protein
318 42 4 -
13 - not identified - - - -
14 P12810 16.9 kDa class I heat shock protein 1 [Triticum aestivum] 821 62 8 stress response
15 Q02400 late embryogenesis abundant protein B19.3 [Hordeum vulgare subsp. vulgare] 234 27 4 stress response
16 AAZ67071 cereal-type amylase inhibitor [Secale cereale] 328 43 4 carbohydrate metabolism
17 - not identified - - - -
18 EMS46390 serpin-Z2B [Triticum urartu] 447 16 7 protease inhibition (resistance)

1 Spot numbering was the same as in Fig. 1 and Supplementary Fig. 1.

2 Database accession (according to NCBInr) of a homologous protein.

3 Homologous protein and organism from which it originates.

4 Mascot MudPIT (Multidimensional Protein Identification Technology) score.

5 Amino acid sequence coverage for the identified proteins; amino acid sequences for the proteins were shown in Supplementary Fig. 2.

6 Molecular function (


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