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Mineral and phenolic content of leaves of Tunisian caprifig (Ficus carica L.) accessions

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A. Essid1*

F. Aljane1

A. Ferchichi1, 2

 

1 Laboratoire d’Aridoculture et Cultures Oasiennes Institut des Régions Arides de Médenine, Médenine 4119, Tunisie

2 Institut National Agronomique de Tunisie, 43 Avenue Charles Nicolle, 1082 Cité Mahrajène, Tunis

 

Abstract: Leaves of twenty accessions of Tunisian caprifig (Ficus carica L.) accessions were investigated for their mineral and phenolic content. Results showed significant differences among accessions for all traits studied. Furthermore, leaves of caprifig are an important source of phenolic and mineral content. Potassium (379.05-1412.84mg/100g) is the major mineral content, followed by calcium (499.20mg/100g), magnesium (320.06mg/100g), phosphorus (175.54mg/100g), sodium (160.36mg/100g), iron (39.08mg/100g), manganese (2.54mg/100g) and zinc (1.41mg/100g). Total phenolic, flavonoid and flavonol contents ranged between 11.88-36.13mg.g-1GAE DW; 5.88-20 mg.g-1QE DW; 3-11.08 mg.g-1QE DW respectively. Cluster analysis and PCA grouped accessions studied in four groups.

 

Keywords: Caprifig, Ficus carica L., leaves, mineral content, phenolic compound Tunisia.

 

1. Introduction

Ficus carica is one the oldest fruit species in the world (Ahmad et al . 2013) and among the first plants cultivated by humans (Mawa et al. 2013). Its seems to be originated from the Southern Arabia and the eastern part of the Mediterranean areas (Ikegami et. 2009). In Tunisia, fig has been traditionally cultivated in diverse edaphoclimatic conditions (Mars 1995) resulting in a high number of local varieties (Chatti et al., 2004, Mars et al. 2008). In fact, variation is an essential criterion for any programs of survival and conservation of species (Osman 2013) and is a key component of any agricultural production system (Frankel et al. 1995). Furthermore, to facilitate breeding program, it is necessary to analyses typical varieties in terms of minerals and micronutrients content (Nicolle et al. 2004).

Minerals are an inorganic substance that plays an important role in health and disease states of humans and domestic animals (Soetan et al. 2010) and necessary for almost metabolic processes (Ndukwe et al.2013). They are classified as macroelements (K, P, Mg, Na and Ca) and microelements (Mn, Fe and Zn) (Sulaiman et al.2011).

Phenolics compounds are the secondary metabolites ubiquitous in plants (Marinova et al. 2005) that have multiple physiological roles (Mawa et al. 2013) and pharmacological properties (Teixeira et al. 2005; Ghazi et al. 2012). Their synthesis can be influenced by diver’s factors such as genotype (Saure 1990; Zadernoski, et al. 2005), nutrient availability, temperature, light (Saure 1990), divers biotic and abiotic stresses (Dixon and Paiva 1995), etc. Several work have been interested to mineral and phenolic content of fruit of female fig tree [Soloman et al. 2006; Oliveira et al. 2009; Aljane and Ferchichi 2009), rare in female fig leaves (Konyalioğlu, et . 2005; Teixeira et al. 2006; Oliveira et al. 2009; Ghazi et al. 2012) and absent in caprifig leaves.

Traditionally, Ficus carica has been used for several purposes (Kalaskar, et al. 2010). Their leaves can constitute an excellent source of phenolics compounds (Oliveira et al. 2009). It have anti-inflammatory activities (Patil and Patil 2011; Tchombé and A.Louajri 2015) and used for several diseases such as hemorrhoids, insect stings and bites (Tchombé and A.Louajri 2015), antioxidant, antimicrobial activity (Ahmad et. 2013). Also, leaf mineral analysis is an important guide for sustainable plant nutrition (Lewko et al. 2004).

Therefore, this study is interested to evaluate mineral and phenolic content of leaves of twenty Tunisian caprifig accessions.

 

2. Materials and Methods

2.1. Plant material

Leaves of twenty accessions of Tunisian caprifig (Table 1) were collected from the fig germplasm collection of Arid Land Institute of Médenine established in ‘El Gordhab’, Tataouine in the South-east of Tunisia.

 

Table 1. Accessions names, code and geographic origin of 20 Tunisian caprifig accessions studied.

No.

Accessions names

Code

Geographic Origin

1

Magouli1

MAG1

Duiret (Tataouine)

2

Jrani

JRN

Ghadhabna (Mahdia)

3

Bithri1

BTH1

Kerkennah (Sfax)

4

Assafri

ASF

Kerkennah (Sfax)

5

Bouharrag1

BHG1

Bir Amir (Tataouine)

6

Bithri2

BTH2

Bir Amir (Tataouine)

7

Dhokkar1

DHK1

Djebba (Béja)

8

Limi

LIM

Kébéli

9

Tebessi

TBS

Kébéli

10

Sawoudi

SWD

Kébéli

11

Magouli2

MAG2

Bir Amir (Tataouine)

12

Dhokkar2

DHK2

Tamaghza (Tozeur)

13

Dhokkar3

DHK3

Dégâche (Tozeur)

14

Dhokkar4

DHK4

Gafsa

15

Bouharrag2

BHG2

Toujen (Gabés)

16

Beldi

BLD

Zarzis (Médenine)

17

Dhokkar6

DKH6

Zarzis (Médenine

18

Dhokkar7

DHK7

Zammour (Médenine)

19

Bouharrag3

BHG3

Djerba (Médenine)

20

Khadhouri

KHD

Djerba (Médenine)

 

2.2. Mineral and phenolic analysis

2.2.1. Mineral compounds

For each sample about 1g of dried leaves was placed in porcelain capsule and heated at 550°C for 4h. After cooling, ashes were treated with 1ml of hydrochloric acid and 5ml of deoinised water, carried to boiling, filtered, adjusted to 100ml with deonised water and solutions were used for mineral analyses. Phosphorous contents were detected by a spectrophotometer (ANTHELIE ADVANCED, Microbeam, S.A.) while that of calcium, iron, potassium, magnesium, manganese, sodium and zinc were performed with flame atomic absorption method. For each accession the experiment was performed three times.

 

2.2.2. Phenolic compounds

The extraction of total phenolic was performed according to protocol previously described (Amin and Tan 2002) with minor modifications. About 0.5g of lyophilized leaves were homogenised with 25ml of boiled ultrapure water, agitated using an orbital shaker at 200 rpm for 2h at 50°C then submitted to centrifugation at 3000 rpm for 15 min at room temperature. The supernatant was conserved at -4°C for further analysis. For each accession extraction was performed three times.

Total phenolic, flavonoid and flavonol content were determined according to the method previously described (Kumaran and Karunakaran 2006). Total phenolic content was determined using the Folin–Ciocalteu reagent. Approximately, 100ul of extract were mixed with 500ul of FCR, 1.5ml of 20% sodium carbonate was added. The mixture was shaken thoroughly and completed to 10 ml with ultrapure water. The absorbance at 765 nm was determined after 2h. Results were expressed as mg gallic acid equivalents (GAE)/100g.

Flavonoid content was determined by aluminium chloride method. About 100ul extract was mixed with 100ul of 20% aluminium trichloride in methanol and a drop of acetic acid, and then diluted with ultrapure water to 5 ml. After 40 min the absorption at 415 nm was read. Results were expressed as mg quercetin equivalents (QE)/100g.

In order to determine a content of flavonols, about 1 ml of each extract was mixed with 1 ml aluminum trichloride (20 mg/ ml) and 3 ml sodium acetate (50 mg/ ml). The absorbance at 440 nm was read after 2.5 h. Results were expressed as mg quercetin equivalents (QE)/100g.

 

2.3. Statistical analysis

Analyses of Variance (ANOVA) were performed for data obtained from mineral and phenolic compound using the XLSTAT-Pro 7.5 program. The Fisher test (LSD) was used to compare the differences among accessions. Principal Component Analysis and cluster analysis of mineral and phenolic compounds were performed using the program NTSYS 2.11 (Exeter Software, Stauket, NY).

 

3. Results and Discussion

3.1. Minerals compounds

Our study showed that mineral composition varied depending on the accession (Table2). Potassium was the highest average content followed by calcium, magnesium, phosphorus, sodium, iron, manganese and zinc. Predominance of potassium content has been indicated in other species of Moraceae such as mulberry species [Ercisli and E.Orhan 2007; Gungor and Sengul. 2008), female figs (Aljane and Ferchichi 2009). The mineral content of caprifig leaves ranged between 379.05 to 1412.84mg/100g for potassium, 169.16 to779.05mg/100g for calcium, 121.14 to 416.27mg/100g for magnesium, 102.16 to 236.60 mg/100g for phosphorus, and 45.76 to 391.68 for sodium, 17.16 to 61.41 for iron, 0.84 to 6.09 for manganese and 0.76 to 2.30 for zinc. Results seem to be in the range to those found in female fig fruit (Soloman et al. 2006; Aljane and Ferchichi 2009).

 

3.2. Phenolic compounds

The concentration of total phenolic, flavonoid and flavonol contents are shown in Table 3. Average of total phenolic was 20.82±5.94mg.g-1GAE DW. The highest value was recorded in TBS (31.38±0.83mg.g-1GAE DW) while the lowest was in DKH3 (11.88±2.44 mg.g-1GAE DW). Those values seem to be higher than those reported in leaves of female fig tree (Konyalioğlu et al. 2005). This higher value in phenolic compound can be attributed to genetic factor (Zadernoski, et al. 2005). But also, to conditions of water stress frequent in Southern Tunisia. In fact, insufficiency of the water in the plant tends to generate this situation of stress which induces the production of phenols (Par and Bolwell 2000).

Total flavonoid content varied from 5.88±0.45mg.g-1QE DW (DKH3) to 17.21±2.43 mg.g-1QE DW (DKH1) with an average of 10.43±2.61 mg.g-1QE DW. Concerning the flavonol content, the values ranged from 3±1.03 mg.g-1QE DW (DKH3) to 8.91±0.30 mg.g-1QE DW (DKH1) with a mean of 5.88±1.77 mg.g-1QE DW

 

Table 2. Mineral composition of leaves of Tunisian caprifig accessions (Ficus carica L.).

Accessions

Calcium

Iron

Potassium

Magnesium

Manganese

Sodium

Zinc

Phosphorus

MAG1

674.50±18.19BC

48.22±6.53BCD

1412.84±82.95A

416.27±23.52A

6.09±0.30A

294.05±34.17B

2.23±0.14ABC

236.60±11.08B

JRN

608.63±75.06CD

37.01±1.22FG

1107.29±38.52C

378.20±32.75ABCDE

4.27±0.34B

209.05±2.83DEF

1.73±0.30DEF

176.30±10.98E

BTH1

305.30±54.23GHI

30.20±6.68G

485.65±114.01G

160.99±26.82G

1.33±0.71GHI

45.76±14.04K

0.97±0.24IJ

139.43±14.97F

ASF

254.72±109.32IJ

29.88±4.32G

407.28±183.40G

389.02±108.56ABCD

1.98±1.62EFGH

48.46±29.82K

1.05±0.60HIJ

162.49±25.94EF

BHG1

169.16±29.08J

17.16±2.15H

379.05±74.57G

121.14±10.76G

0.84±0.60I

95.57±18.60JK

0.76±0.19J

102.16±3.11G

BTH2

375.84±39.47G

30.17±6.03G

819.55±208.73EF

298.38±53.72EF

2.92±0.65CDE

100.77±8.77JK

1.75±0.24DEF

158.41±24.29EF

DKH1

335.85±25.73GHI

36.22±2.11FG

781.47±128.67EF

285.86±70.94F

2.35±0.43DEF

191.26±1EFG

1.16±0.05HIJ

197.21±16.09DE

LIM

481.09±30.50EF

43.91±6.37CDEF

881.71±17.06E

405.12± 70.09AB

1.79±0.36FGH

127.48±8.44IJ

1.46±0.27DEFGH

179.99±19.95DE

TBS

467.81±16.77F

51.07±3.08BCD

1175.56±168.82BC

326.25±49.76BCDEF

1.23±0.32HI

131.27±14.39HIJ

1.37±0.37EFGHI

189.57±23.9 6CDE

SWD

773.65±18.22A

42.63±0.90DEF

1085.43±126.01CD

398.27±55.60ABC

2.80±0.23CDE

187.93±15.05EFGH

1.89±0.07BCD

222.03±6.20BC

MAG2

368.96±67.67GH

50.21±10.01BCD

825.09±67.19EF

275.07±52.65F

2.66±0.76CDEF

175.51±41.94FGHI

1.64±0.36DEFG

212.40±32.87BCD

DKH2

779.05±52.17A

42.19±6.11DEF

1166.07±102.79BC

337.48±35.31ABCDEF

2.87±0.22CDE

234.13±38.34CDE

1.33±0.38FGHI

187.39±14.77DE

DKH3

650.67±53.09BC

37.68±0.86EFG

795.96±120.89EF

310.86±51.40DEF

2.06±0.34EFGH

134.63±21.39GHIJ

1.33±0.06FGHI

164.01±9.15EF

DKH4

593.51±53.66CD

46.23±9.09BCDE

901.69±164.02DE

395.61±66.72ABC

2.39±0.32DEF

252.33±72.79BCD

1.38±0.3 1EFGHI

184.85±23.77DE

BHG2

649.33±22.35BC

43.39±5.29CDEF

673.31±70.50F

302.40±45.43EF

2.57±0.40DEF

177.12±40.08FGHI

1.13±0.23HIJ

137.78±25.18F

BLD

610.46±52.35CD

46.19±3.83BCDE

751.31±27.39EF

340.51±9.34ABCDEF

3.15±0.39CD

260.18±60.20BCD

1.26±0.23GHI

189.56±32.28CDE

DKH6

618.06±57.70CD

44.53±2.48CDEF

770.03±53.91EF

406.77±49.66AB

3.58±0.45BC

274.01±34.85BC

1.80±0.21CDE

178.72±18.13E

DKH7

286.11±46.73HI

51.75±7.42BC

1291.46±123.01AB

315.37±25.56CDEF

1.26±0.09HI

297.68±39.51B

2.38±0.26A

323.80±19.08A

BHG3

718.43±75AB

54.26±2.82AB

673.27±53.81F

296.60±37.28EF

2.26±0.55DEFG

204.03±45.96DEF

1.25±0.23GHI

139.39±28.63F

KHD

558.14±66.14DE

61.41±7.02A

1178.01±17.43BC

302.95±23.74EF

5.65±0.56A

391.68±37.90A

2.30±0.17AB

186.47±10.43DE

F test

35.12

10.67

19.96

7.08

17.06

19.95

8.03

14.94

Pr > F

< 0.0001

< 0.0001

< 0.0001

< 0.0001

< 0.0001

< 0.0001

< 0.0001

< 0.0001

 

 

Table 3. Total phenolic, flavonoid and flavonol composition of leaves of Tunisian caprifig accessions (Ficus carica L.).

Accessions

Total phenolic

Flavonoid

Flavonol

MAG1

16.25±0.54GH

8.67±1.31HI

3.95±0.96IJ

JRN

16.81±0.85GH

10.08±0.56FGHI

5.41±0.25GH

BTH1

24.56±6.94CD

10.33±1DEFGH

7.35±0.78C

ASF

18.35±3.70FG

8.75±1.31HI

4.53±0.75HI

BHG1

26.85±4.26BC

11.88±0.75DEF

8.71±0.46B

BTH2

22.94±3.74CDEF

10±1.09GHI

5.44±0.70FGH

DKH1

26.25±6.22BC

17.21±2.43B

8.91±0.30B

LIM

16.71±1.44GH

11.04±0.44DEFG

6.11±0.17EFG

TBS

31.38±0.83AB

12±0.66DE

6.79±0.38CDE

SWD

17.15±2.75GH

12.08±1.25D

4.30±0.75I

MAG2

26.10±1.90BC

10.25±0.38EFGHI

7.15±0.11CD

DKH2

15.83±2.01GH

8.46±0.26I

4.21±0.40I

DKH3

11.88±2.44H

5.88±0.45J

3±1.03J

DKH4

19.96±3.75DEFG

8.50±0.94I

5.88±0.95EFG

BHG2

21.33±0.57CDEFG

11.25±0.37DEFG

6.41±0.59CDEF

BLD

18.54±5.18EFG

11.92±1.59DE

8.76±0.22B

DKH6

19.79±0.63DEFG

13.92±1.65C

8.39±0.62B

DKH7

36.13±4.52A

20±1.62A

11.08±0.49A

BHG3

24.17±4.41CDE

11.17±0.29DEFG

8.76±0.30B

KHD

17.65±1.03FG

9.46±0.52GHI

6.30±0.25DEFG

F test

8.64

24.22

37.13

Pr > F

< 0.0001

< 0.0001

< 0.0001

 

3.3. Cluster and Principal Compound Analysis

Cluster analysis using the unweighted pair group method with arithmetic mean (UPGMA) based on mineral and phenolic compound revealed that the 20 accessions studied could be divided into 4 groups (Figure 1). Group (A) included DKH7 accession where is content the most important values in zinc, phosphorus, total phenolic, flavonoid and flavonol. Group (B) contain two accessions (BHG1 and BTH1) were characterized by the low values in magnesium and zinc. Group (C) formed the almost of accessions and group (D) contain two accessions (KHD and MAG1) who are distinguished by the most important values in manganese. Group (C) can be subdivided in two subgroup. First subgroup (C.1) contains ASF accession and the second (C.2) is formed by the remaining of accessions.

Principal component analysis for mineral and phenolic compound indicates that the first three PCAs explained 39.90%, 30.03% and 11.72% of the total variation (Table 4). PCA results suggest that calcium, potassium, magnesium, manganese, sodium, zinc and phosphorus are the major mineral and phenolic compounds composing PCA1. Total Phenolic, flavonoid and flavonol are the important variables composing PCA2. Finally, iron is the trait that composing PCA3.

As in the UPGMA cluster analysis four groups have been found (Figure 1). Both UPGMA and PCA showed that geographic origin is not the main critical trait to classify accessions studied.

 

Figure 1. UPGMA cluster analysis of studied caprifig accessions based on mineral and phenolic content.

 

Table 4. Eigenvectors obtained from PCA analysis of studied caprifig accessions.

 

PC1

PC2

PC3

Eigenvalue

4.39

3.30

1.29

Variance(%)

39.90

30.03

11.72

Accumulative variance(%)

39.90

69.93

81.66

Traits

Eigenvalue

 

 

Calcium

0.68

0.38

0.32

Iron (Fer)

-0.27

0.45

-0.76

Potassium

0.84

-0.24

-0.30

Magnesium

0.74

0.18

-0.19

Manganese

0.79

0.22

0.12

Sodium

0.80

-0.38

0.37

Zinc

0.82

-0.38

-0.18

Phosphorus

0.61

-0.58

-0.43

Total phenolic

-0.42

-0.82

-0.17

Flavonoid

-0.11

-0.90

-0.07

Flavonol

-0.34

-0.85

0.28

 

Figure 2. Distribution of caprifig accessions studied in the first two principal components (PCs) based on mineral and phenolic traits.

 

4. Conclusions

Caprifig leaves were analyzed for their content to mineral and phenolic content. Significant differences among accessions studied were observed indicating a great mineral and phenolic diversity. Potassium presents the highest amount in mineral content. Leaves of Tunisian caprifig accessions are good source of mineral and phenolic content. So, it is important to use this specie not only for genetic diversity but also for their therapeutic effect. Cluster analysis and PCA grouped accessions studied into four groups. Both PCA and UPGMA cluster analysis showed that geographic origin is not the main critical trait to discriminate between accessions of caprifig tree studied. DKH7 originated from Zammour (Médenine) diverged from other accessions by their most important values in zinc, phosphorus, total phenolic, flavonoid and flavonol.

 

Acknowledgements

We gratefully acknowledge the farmers in ‘CFPA’ ‘El Gordhab’, Tatouine and the Institute of Arid Region, Médenine Tunisia for their cooperation and B. Lachiheb for mineral content help.

 

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