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Revista mexicana de fitopatología

On-line version ISSN 2007-8080Print version ISSN 0185-3309

Rev. mex. fitopatol vol.36 n.3 Texcoco Oct./Dec. 2018

http://dx.doi.org/10.18781/r.mex.fit.1805-2 

Scientific articles

Effect of alcoholic extracts of garlic (Allium sativum) and clove (Syzygium aromaticum) on the development of Mycosphaerella fijiensis Morelet

María de Lourdes Adirano-Anaya1 

Josué Mejía-Ortiz1 

Isidro Ovando-Medina1 

Víctor Albores-Flores1 

Miguel Salvador-Figueroa1  * 

1 Instituto de Biociencias. Universidad Autónoma de Chiapas. Boulevard Príncipe Akishino s/n, Colonia Solidaridad 2000, CP. 30798, Tapachula, Chiapas.

Abstract:

Black Sigatoka is the most destructive disease of the leaves of bananas. The increased resistance of the pathogen and the contamination caused by chemical fungicides have guided the search for control alternatives. The objective of the work was to determine the effect of the combination of extracts of garlic (Allium sativum) and clove (Syzygium aromaticum) in the development of Mycosphaerella fijiensis. The phytopathogen was grown in potato-dextrose-agar (PDA) media added with different concentrations of extracts. A factorial design of two factors at four levels was established. At higher concentration of garlic extract, less capacity to inhibit M. fijiensis colony. In contrast, the clove extract showed greater inhibition capacity at the higher concentration. The greatest inhibition of the growth, 39.6%, was with the mixture of 150 mg of garlic extract·ml-1 and 36 mg of clove extract·ml-1.

Key words: phytopathogen; banana; extract; plants; aromatic

Black Sigatoka (BS) is a foliar disease of bananas and plantains caused by Mycosphaerella fijiensis Morelet. The disease was first detected in the Fiji Islands but is currently present in all banana and plantain production areas worldwide (Etebu and Young-Harry, 2011). When areas of leaves become infected, they darken, which obstructs photosynthesis, and, if the disease is not controlled, the leaves will eventually die. When limited by photosynthates, bananas and plaintains ripen prematurely and production diminishes (Ewané et al., 2013). Chemical fungicides are usually applied to control BS. In the Americas, the annual frequency of chemical fungicide applications ranges from 35 to 45 times (Ploetz, 2000). However, the increased resistance of M. fijiensis to chemical fungicides, as well as their residual effects, range of action and phytotoxicity, have made it necessary to find alternative methods for controlling BS (Bastos and Albuquerque, 2004).

Plants are the organisms that have been most extensively studied in order to counteract the harmful effects of phytopathogenic fungi. For this reason, a wide range of plants (Castillo et al., 2012) and plant products (Malik et al., 2016) have been reported to have fungicidal activity. Herbs and spices (aromatic plants) are the plants that have been studied the most. Both essential oils and extracts obtained from those plants using different solvents and processes have shown an antifungal effect against phytopathogens of the following genera: Colletotrichum (Sundaramoorthy et al., 2014; Radwan et al., 2014; Garcia, 2011), Aspergillus (Tijjani et al., 2014; Askun et al., 2008), Phoma (Touba et al., 2012), Fusarium (Taskeen-Un-Nisa et al.,2011), Penicillium (Daniel et al., 2015; Ikeura et al., 2011), Botrytis (Daniel et al., 2015; Sesan et al., 2015) and Alternaria (Nashwa and Abo-Elyousr, 2012). Essential oils and extracts have been reported to have antifungal activity both on mycelial growth and spore germination (Hernández et al., 2007); and [the activity] can be biocidal or biostatic (Landero et al., 2013).

As for M. fijiensis, Gutiérrez-Jiménez et al. (2017) reported that essential clove oil (50 to 5000 ppm in agar-dextrose-potato (ADP) medium) inhibited the colony’s radial growth by 3.5% to 10.5%. Sharanamma (2012) reported that adding 5%, 10% and 15% of garlic extract (Allum sativum) (1 ggarlic·mlH2O -1) to the ADP medium inhibited the colony’s growth by 14.8%, 18.5% and 23.0%, respectively. De Hora (2009) reported that the pathogen’s spore germination was inhibited between 92% and 86% on average when it was grown in ADP to which 10% or 30% of essential clove (Syzygium aromaticum) oil or essential eucalyptus oil (Eucalypto globulus) were added, for the first value, and thyme (Thymus vulgaris) for the second.

Based on the information above, we would assume that a combination of extracts and/or essential oils of aromatic plants could be an alternative for reducing M. fijiensis development. However, since using a combination of two or more extracts and/or essential oils for this purpose has been underexplored, the objective of the present research was to determine the effect of a combination of garlic (Allium sativum) and clove (Syzygium aromaticum) extracts on Mycosphaerella fijiensis development.

MATERIALS AND METHODS

Mycosphaerella fijiensis isolates

Mycosphaerella fijiensis was isolated from banana leaves with BS symptoms, following the procedure described by Conde-Ferráez et al. (2008). The leaves were washed with water and detergent, and then subjected to aseptic processing (they were immersed in 5% sodium hypochlorite for 5 min, in 70% ethanol for 5 min, and then rinsed with sterilized water). The leaves were placed in plastic bags containing cotton swabs saturated with sterile distilled water, and incubated at 26 °C for 48 h in darkness. Once the incubation period ended, circles 20 cm in diameter from infected leaves were stuck to filter paper sterilized and moistened with sterile water, taking care to ensure that the leaves’ underside faced the paper. This array was placed on the lid of a Petri dish in such a way that the leaf surface faced the culture medium (ADP) at the base of the Petri dish. The Petri dish was incubated at 27 °C for 12 h. Once the period of incubation ended, M. fijiensis hyaline ascospores were spotted under a laminar flow hood using an stereoscopic microscope.

Morphological ascospore identification and characterization of the M. fijiensis colony

To morphologically identify M. fijiensis ascospores, we followed the procedure suggested by Pérez (2002). The ascospores were hyaline and spherical with a slightly constricted septum. To characterize the M. fijiensis colony, the ascospores were grown in ADP medium, following the procedure of Sepúlveda (2015) and Manzo-Sánchez et al. (2001). The colony’s morphology was quasi-circular, white above and black below, and presented exudates.

Preparing garlic (Allium sativum) and clove (Syzygium aromaticum) extracts.

The garlic extract was obtained in a Soxhlet extractor applying the reflux technique. For extraction, 45 g of fresh garlic were macerated in a porcelain mortar and placed on filter paper to form a “thimble-shaped” structure that was placed in the Soxhlet. For the reflux procedure, 60% ethanol (200 ml) was used. When the boiling point of 60% ethanol was reached, the reflux was repeated for six cycles. To obtain the clove extract, 100 g of cloves previously ground to <2mm particles were suspended in one liter of 96% ethanol. The mixture was kept in darkness for 28 days, and shaken manually every three days. The extracts were concentrated by low-pressure evaporation at 37 °C in a Rotavapor (Buchi R300) until dry. The solids obtained were kept in amber jars at 6 °C until they were used. To use the extracts at the required concentration, the solids were diluted in absolute ethanol.

Treatment design.

A two-factor (garlic and clove extracts) 42 factorial design was used at four levels (extract concentration), which resulted in 16 treatments (Table 1).

Table 1 Treatments used to determine the capacity of alcoholic clove and garlic extracts to inhibit the growth of M. fijiensis

Tratamiento Extracto de ajo
(µg·ml-1)
Extracto de clavo
(µg·ml-1)
1 0 0
2 0 12
3 0 24
4 0 36
5 150 0
6 150 12
7 150 24
8 150 36
9 300 0
10 300 12
11 300 24
12 300 36
13 450 0
14 450 12
15 450 24
16 450 36

Determining M. fijiensis growth inhibition and colony growth rate.

Mycosphaerella fijiensis growth inhibition was calculated after analyzing the area gained by the colony. For this purpose, Petri dishes (15 cm in diameter) were filled with ADP, to which the required amount of garlic and/or clove extract for each treatment was added. A disk ≈3 mm in diameter containing mycelium from the M. fijiensis colony, which had been previously grown in ADP culture medium, was placed in each Petri dish (four dishes per treatment). The fungus was cultured at 30 °C. Every seven days, and for a 28-day period, and the colony’s diameter was measured with a digital calibrator (Mitutoyo, Digimatic, at 0.01 mm resolution). Having obtained the diameter of the colony, the growth area was calculated by applying the circle formula [A (mm2) = π r2)]; to calculate the treatment’s inhibition (%), we used the following formula:

Inhibition (%) = [(AET1 - AETN) (AET1)-1] (100), where

AET1 = Effective growth area of the control treatment

(mm2) = AT1n - AT10

AETN= Effective growth area of the N treatment

(mm2) = ATNn - ATN0

AT1n = Growth area of the control treatment at any time (mm2)

AT10 = Growth area of the control treatment at t = 0 (mm2)

ATN0 = Growth area of any treatment at any time (mm2)

ATN0 = Growth area of any treatment at t = 0 (mm2).

The rate at which the colony grew (µ=week-1) was calculated as the slope of the linear ratio between the conversion of the nominal value of AETN to Ln and the time (weeks).

Statistical analysis.

The values of the colony area were subjected to an analysis of variance, and where differences were found, we used the Tukey’s test (α<0.05). The analysis and tests were conducted with the InfoStat program Profesional version 2011.

RESULTS

Table 2 shows the values of the growth area of M. fijiensis colonies in the different treatments and sampling times. These results show that the inoculum was of similar size (week 0), and that the growth of the colony during the first week was similar too. As of the second week and up to the final week, the area of the colony was different. When the present research was concluded (week 4), the area of the colonies in all the treatments in which garlic and/or clove were used was statistically smaller than the area in the treatment with no extracts (Treatment 1). Also, the area of the colony in Treatment 1 was 1.6 times larger than the area in treatments 9 and 10. The analysis of variance for the values of M. fijiensis growth area showed that there were significant differences between them, for clove and garlic extracts individually, and when they were combined (Table 3).

Table 2 Area of M. fijiensis colony after four weeks of growth in ADP medium to which garlic and/or clove extract were added. 

Tratamiento Semana 0 Semana 1 Semana 2 Semana 3 Semana 4
1 7.23 R 26.89 P 100.88 LM 193.98 CDE 264.73 A
2 6.52 R 29.38 P 97.52 MN 150.94 GHIJK 201.95 BCD
3 8.45 QR 28.26 P 97.09 MN 160.40 FGH 210.77 B
4 7.36 R 27.65 P 85.36 MN 137.74 K 194.97 BCDE
5 7.42 R 28.32 P` 88.76 MN 151.82 GHIJK 194.39 BCDE
6 7.76 R 31.06 P 100.49 LM 163.20 FG 200.00 BCDE
7 7.23 R 24.36 PQ 82.05 N 142.66 IJK 168.83 F
8 8.04 QR 30.67 P 52.38 Q 88.07 MN 163.61 FG
9 7.15 R 27.03 P 92.01 MN 145.49 HIJK 185.31 E
10 6.91 R 34.95 P 90.39 MN 155.77 FGHIJ 207.61 BC
11 6.75 R 25.22 P 87.79 MN 155.31 FGHIJ 200.79 BCDE
12 7.31 R 34.26 P 92.44 MN 141.89 JK 203.32 BCD
13 7.24 R 30.87 P 115.01 L 163.47 FG 204.14 BCD
14 6.84 R 22.12 PQR 85.02 MN 148.97 GHIJK 210.16 BC
15 6.59 R 25.30 P 90.93 MN 159.60 FGH 192.00 DE
16 6.93 R 25.17 P 86.14 MN 159.00 FGHI 191.87 DE

Different letters indicate significant values [Tukey a< 0.05; significant minimum difference (DMS) =16.05; standard error = 5.91]. The composition of the culture medium for the treatment was ADP to which garlic and/or clove extract was added, in accordance with the statistical design.

Table 3 Analysis of variance of the values of the area of an M. fijiensis colony grown in ADP medium to which garlic and/or clove extract was added. 

Fuente de variación gl F Valor de P
Ajo 3 22.89 <0.0001
Clavo 3 23.71 <0.0001
Ajo * Clavo 9 10.5 <0.0001
Error 260

Regarding the individual effect of the extracts, Figure 1 shows that as the garlic extract concentration increased, the average growth area of the colony increased (less inhibition). In contrast, the higher the concentration of clove extract, the greater the inhibition. In both cases, the differences were significant (Tukey α< 0.05; DMS = 3.57).

Figure 1 Average growth area of the M. fijiensis colony in ADP culture medium to which diffferent concentrations of garlic (above) and clove (below) were added. 

Figure 2 shows the percentage of colony inhibition after four weeks growing in the culture media of the different treatments. All treatments proved to be able to inhibit the development of the M. fijiensis colony (ranging from 21.0% to 39.6%). The highest inhibition percentage was observed in a culture medium containing the smallest amount of garlic extract and the greatest amount of clove extract (Treatment 8).

Figure 2 Growth inhibition of the M. fijiensis colony (% area) after four weeks of cultivation in the different treatments shown in Table 1

When data from the area of the colony (mm2) were converted to Ln for each week of culture, a similar performance was observed in all treatments. Figure 3 shows the extreme treatments, that is, the treatment with the largest areas (Treatment 1) and the one with the smallest areas (Treatment 8). The values of the regression line for all the treatments are shown in Table 4. As can be seen in the table, the slope of the line (m) or colony growth rate (week-1) for all the treatments ranged from 0.7081 week-1 to 0.9177 week-1. Therefore, the colony growth rate of Treatment 10 was 23% slower compared to the growth rate of Treatment 1. As for the intercept, it had an average value of 2.3589 ±0.07675 and, except for Treatment 13, all the determination coefficients were higher than 0.9.

Figure 3 Correlation between the Ln of the M. fijiensis colony in the treatment without garlic and/or clove extracts (Treatment 1, above) and the treatment in which 150 µg of garlic extract ml-1 and 36 µg of clove extract ml-1 were used (Treatment 8; below), and growing time (weeks). 

Table 4 Slope values (m) or growth rate (week-1), intercept (b) and determination coefficient (r2) after linearizing Ln data from the colony area (mm2) and the cultivation week. 

Tratamiento m B r2
1 0.92 2.31 0.94
2 0.85 2.33 0.91
3 0.82 2.46 0.93
4 0.82 2.36 0.93
5 0.82 2.38 0.92
6 0.82 2.47 0.91
7 0.81 2.32 0.92
8 0.71 2.39 0.95
9 0.82 2.36 0.91
10 0.83 2.42 0.91
11 0.86 2.27 0.93
12 0.81 2.45 0.91
13 0.83 2.44 0.89
14 0.88 2.21 0.94
15 0.86 2.27 0.92
16 0.85 2.29 0.9243

DISCUSSION

Like many phytopathogenic fungi, M. fijiensis was sensitive to the components of ethanolic garlic and clove extracts. The type of compound and/or its concentration, or flavonoids, phenols, terpenes, essential oils, alcaloids, lectins, polypeptides, among others, could be responsible for this action (Hernández et al., 2007). Oxidation of various compounds caused by phenols, lipophilic action of essential oils, insertion of alcaloids into the DNA, formation of ionic channels in the cell envelope mediated by lectins and competitive inhibition of receptor polysaccharides by polypeptide adherence, are some of the mechanisms that may explain the fungicidal activity (Cowan, 1999; Nonsee et al., 2011; Rahnama et al., 2012).

The higher sensitivity of M. fijiensis to the antifungal action of clove (Figure 1) may also be due to the composition and/or concentration of the compounds it contains. In this regard, essential clove oil, which is miscible in ethanol, contains, among other compounds, eugenol, eugenyl acetate, caryophyllene and a-humulene (Costa et al., 2011; Moura et al., 2012). Garlic is rich in alicin, diallyldisulfide and diallyltrisulfide (Campa-Siqueiros et al., 2017; Chong et al., 2015).

In the beginning, the expectation was that increased concentrations of clove and garlic extracts would increase the level of antifungal activity. This did happen when clove extract was used alone, but exactly the opposite happened when garlic extract was used (Figure 1), a fact that corroborated the results reported by Landero et al. (2013). This might be explained as being a model of competitive inhibition of some enzyme, where as the garlic extract concentration increases, one of its components takes the place of the one that has antifungal activity. Therefore, when the extract is diluted (lower concentration), the competitive component of the antifungal is not able to occupy all the “active sites;” as a result, the inhibition of the development of the M. fijiensis colony was lower. The results of the final phase (data not shown) support what we previously proposed, because when the garlic extract concentration was reduced to 100 mg·ml-1, the antifungal activity increased. In the future, it will be necessary to determine which competitive component (or components) is/are involved and where the action takes place (site(s)).

As for the antifungal activity of the clove extract (Figure 1), it was typical of molecules whose activity increases as their concentration increases. However, it had a maximum value (Figure 4), and, again, this may suggest that it contains an active fungicidal component and that the carrier system has a limited concentration in the M. fijiensis cell envelope.

The fact that no significant differences in the area of M. fijiensis growth were found during the first two weeks of treatment (Table 2) may indicate that a) the action site of the antifungal treatment is intracellular, which means that first it has to be introduced through a transportation mechanism, possibly an active one, and b) the active component is a compound derived from the metabolic process of one of the extract components. In both cases, transportation through the cell envelope seems to be the limiting stage because, once the critical concentration of the antifungal is reached, its impact is expressed as a reduction of growth rate (Figure 3).

The maximum inhibition value expressed when using a mixture of clove and garlic extracts in Treatment 8 (Figure 2) shows a potential synergy between the components of both extracts, since in the treatments containing only garlic (Treatments 5, 9 and 13) or only clove (Treatments 2, 3 and 4) at different concentrations, the average inhibition activity was 27.2% and 24.2%, respectively. Based on the above, it could be assumed that the components of both extracts act independently, a fact that remains to be proven.

Regardless of the above, the maximum inhibition of M. fijiensis population growth caused by the garlic and clove mixture (Treatment 8) obtained in the present study was four times higher than the inhibition reported by Gutiérrez-Jiménez et al. (2017), who used Petri dishes containing ADP to which 50, 100, 500, 1000 and 5000 ppm of essential clove oil were added, and 2.7 to 1.8 times higher than the inhibition reported by Sharanamma (2012), who used Petri dishes containing ADP to which 5%, 10% and 15% of aqueous garlic extract (1 ggarlic·mlH2O -1) was added.

On the other hand, the maximum inhibition is within the range reported for garlic extracts used for controlling diverse phytopathogenic fungi, such as Colletotrichum sp. (García, 2011; Landero et al., 2013; Sundaramoorthy et al., 2014; Cruz et al., 2013; Hernández et al., 2007), Rhizoctonia sp. (Chávez and Aquino, 2012), Fusarium sp. (Taskeen-Un-Nisa et al., 2011; Chávez and Aquino, 2012), Sclerotium sp. (Chávez and Aquino, 2012), Botrytis sp (Daniel et al., 2015; Sesan et al., 2015), Alternaria sp. (Nashwa and Abo-Elyousr, 2012), Aspergillus (Tijjani et al., 2014), and Penicillium (Ikeura et al., 2011), or for clove extracts: Colletotrichum sp. (Radwan et al., 2014).

CONCLUSIONS

As the concentration of alcoholic garlic extract in the ADP medium increases, the inhibition of M. fijiensis colony growth decreases.

As the concentration of alcoholic clove extract in the ADP medium increased, the level of inhibition of M. fijiensis colony growth also increased.

The mixture of alcoholic garlic and clove extracts has a positive synergistic effect that inhibits M. fijiensis colony growth.

In the ADP medium to which 150 mg·ml-1 of alcoholic garlic extract and 36 mg·ml-1 of alcoholic clove extract were added, M. fijiensis growth colony was reduced by 39.6%, so this could be an alternative for controlling the pathogen in the field.

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Received: May 16, 2018; Accepted: July 17, 2018

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