Exogenous Application of Melatonin and Methyl Jasmonate as a Pre-Harvest Treatment Enhances Growth of Barhi Date Palm Trees, Prolongs Storability, and Maintains Quality of Their Fruits under Storage Conditions
Abstract
:1. Introduction
2. Results
2.1. Effects on Relative Chlorophyll Pigments
2.2. Effects on the Nutrient Contents
2.3. Effects on the Yield and Its Components
2.4. Effect on the Fruit Weight Loss
2.5. Effect on the Fruit Decay
2.6. Effect on the Fruit Firmness
2.7. Effect on the Total Soluble Solids Content (TSS)
2.8. Effect on the Total Sugars Content (TS)
2.9. Effect on the Total Acidity (TA)
2.10. Effect on the Total Phenolic Content and Activity of Peroxidase and Polyphenol Oxidase Enzymes
2.11. Correlations between the Recorded Variables from the Date Palm Trees
2.12. Scanning Electron Microscopy (SEM)
3. Discussion
4. Materials and Methods
4.1. Chemicals and Date Palm Cultivar
4.2. Field Experiment
4.2.1. Biochemical Analyses of Date Palm Leaves
4.2.2. Yield and Its Components
4.2.3. Postharvest Physical Properties of Date Palm Fruits
4.2.4. Postharvest Chemical Properties of Date Palm Fruits
4.2.5. Biochemical Analyses of Date Palm Fruits
4.2.6. SEM Observations
4.3. Statistical Analyses
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Treatment | Nitrogen (%) | Phosphorus (%) | Potassium (%) | ||||
---|---|---|---|---|---|---|---|
2020 | 2021 | 2020 | 2021 | 2020 | 2021 | ||
Control | 1.27 ± 0.02 g | 1.28 ± 0.01 g | 0.20 ± 0.01 g | 0.21 ± 0.01 g | 1.40 ± 0.01 f | 1.41 ± 0.02 f | |
Methyl Jasmonate (ppm) | 10 | 1.27 ± 0.04 g | 1.28 ± 0.01 g | 0.23 ± 0.01 f | 0.24 ± 0.01 f | 1.41 ± 0.01 ef | 1.43 ± 0.01 f |
20 | 1.32 ± 0.02 fg | 1.33 ± 0.01 f | 0.24 ± 0.01 f | 0.25 ± 0.02 f | 1.42 ± 0.01 ef | 1.43 ± 0.02 f | |
50 | 1.33 ± 0.02 f | 1.35 ± 0.02 f | 0.28 ± 0.02 e | 0.29 ± 0.03 e | 1.43 ± 0.02 e | 1.48 ± 0.02 e | |
Melatonin (ppm) | 10 | 1.42 ± 0.03 e | 1.44 ± 0.02 e | 0.39 ± 0.01 d | 0.40 ± 0.03 d | 1.54 ± 0.02 d | 1.56 ± 0.03 d |
20 | 1.46 ± 0.01 de | 1.47 ± 0.01 d | 0.40 ± 0.01 cd | 0.41 ± 0.02 cd | 1.55 ± 0.01 d | 1.58 ± 0.02 d | |
50 | 1.48 ± 0.01 d | 1.49 ± 0.04 d | 0.41 ± 0.02 c | 0.43 ± 0.02 c | 1.61 ± 0.01 c | 1.62 ± 0.01 c | |
Methyl Jasmonate + Melatonin (ppm) | 10 | 1.55 ± 0.02 c | 1.56 ± 0.03 c | 0.44 ± 0.01 b | 0.46 ± 0.01 b | 1.68 ± 0.02 b | 1.68 ± 0.03 b |
20 | 1.64 ± 0.01 b | 1.67 ± 0.02 b | 0.47 ± 0.02 a | 0.49 ± 0.03 a | 1.69 ± 0.03 b | 1.71 ± 0.02 b | |
50 | 1.80 ± 0.03 a | 1.82 ± 0.03 a | 0.48 ± 0.02 a | 0.49 ± 0.03 a | 1.73 ± 0.03 a | 1.74 ± 0.03 a |
Treatment | Yield/Palm (kg) | Bunch Weight (kg) | Fruit Length (cm) | Fruit Diameter (cm) | |||||
---|---|---|---|---|---|---|---|---|---|
2020 | 2021 | 2020 | 2021 | 2020 | 2021 | 2020 | 2021 | ||
Control | 96.4 ± 1.85 h | 96.6 ± 1.93 i | 9.47 ± 0.45 g | 9.57 ± 0.881 g | 2.99 ± 0.41 g | 3.00 ± 0.62 g | 2.52 ± 0.35 h | 2.53 ± 0.21 h | |
Methyl Jasmonate (ppm) | 10 | 100.4 ± 2.86 g | 100.5 ± 2.11 h | 9.73 ± 0.81 fg | 9.80 ± 1.01 fg | 3.01 ± 0.33 fg | 3.05 ± 0.81 fg | 2.53 ± 0.84 gh | 2.55 ± 0.47 h |
20 | 104.9 ± 1.81 f | 105.4 ± 1.89 g | 10.4 ± 0.74 ef | 10.5 ± 0.96 e | 3.04 ± 0.72 fg | 3.07 ± 0.56 fg | 2.55 ± 0.32 gh | 2.57 ± 0.73 gh | |
50 | 105.5 ± 2.42 f | 105.6 ± 1.74 g | 10.7 ± 0.70 e | 10.8 ± 0.93 e | 3.05 ± 0.33 fg | 3.08 ± 0.61 fg | 2.57 ± 0.44 f | 2.59 ± 0.55 g | |
Melatonin (ppm) | 10 | 115.1 ± 1.78 e | 115.7 ± 2.01 f | 11.8 ± 0.91 d | 12.4 ± 1.13 d | 3.23 ± 0.64 e | 3.25 ± 0.47 e | 2.64 ± 0.62 e | 2.65 ± 0.51 f |
20 | 119.1 ± 1.65 d | 119.3 ± 1.68 e | 12.2 ± 1.01 cd | 12.5 ± 1.12 d | 3.30 ± 0.44 d | 3.34 ± 0.63 d | 2.67 ± 0.94 e | 2.68 ± 0.32 e | |
50 | 121.3 ± 2.31 d | 123.0 ± 1.77 d | 12.7 ± 1.00 c | 13.0 ± 1.22 cd | 3.38 ± 0.95 c | 3.40 ± 0.70 c | 2.74 ± 0.32 d | 2.75 ± 0.19 d | |
Methyl Jasmonate + Melatonin (ppm) | 10 | 128.3 ± 2.57 c | 129.6 ± 2.10 c | 12.9 ± 0.98 c | 13.5 ± 0.99 bc | 3.45 ± 0.55 b | 3.48 ± 0.45 b | 2.78 ± 0.61 c | 2.79 ± 0.75 c |
20 | 132.9 ± 2.30 b | 134.7 ± 2.11 b | 13.7 ± 1.02 b | 13.9 ± 1.30 b | 3.48 ± 0.43 b | 3.49 ± 0.69 b | 2.82 ± 0.49 b | 2.84 ± 0.84 b | |
50 | 145.5 ± 1.95 a | 146.3 ± 2.05 a | 14.3 ± 1.10a | 14.6 ± 1.15 a | 3.54 ± 0.87 a | 3.59 ± 0.83 a | 2.85 ± 0.63 a | 2.88 ± 0.90 a |
Treatment | Days after Harvest | ||||||||
---|---|---|---|---|---|---|---|---|---|
Weight Loss (%) | Fruit Decay (%) | ||||||||
14 | 28 | 14 | 28 | 14 | 28 | 14 | 28 | ||
2020 | 2021 | 2020 | 2021 | ||||||
Control | 1.40 ± 0.31 a | 3.03 ± 0.51 a | 1.83 ± 0.44 a | 3.30 ± 0.60 a | 6.0 ± 1.0 a | 15.0 ± 1.1 a | 6.3 ± 1.0 a | 15.7 ± 1.2 a | |
Methyl Jasmonate (ppm) | 10 | 1.04 ± 0.22 b | 2.27 ± 0.34 b | 0.93 ± 0.12 b | 1.67 ± 0.47 b | 3.0 ± 0.9 b | 8.67 ± 0.9 b | 4.0 ± 0.7 b | 8.67 ± 0.9 b |
20 | 0.48 ± 0.08 c | 1.10 ± 0.37 c | 0.41 ± 0.09 c | 0.83 ± 0.14 c | 2.7 ± 0.8 bc | 7.67 ± 0.6 c | 3.7 ± 0.5 bc | 8.33 ± 0.8 bc | |
50 | 0.16 ± 0.03 d | 0.49 ± 0.09 d | 0.22 ± 0.05 d | 0.60 ± 0.11 d | 2.7 ± 0.7 bc | 6.67 ± 0.6 d | 3.0 ± 0.5 d | 8.00 ± 0.4 c | |
Melatonin (ppm) | 10 | 0.23 ± 0.06 bc | 0.49 ± 0.07 d | 0.20 ± 0.05 d | 0.49 ± 0.09 de | 2.3 ± 0.6 c | 6.33 ± 0.7 de | 3.0 ± 0.6 d | 7.33 ± 0.7 d |
20 | 0.25 ± 0.05 bc | 0.42 ± 0.06 de | 0.18 ± 0.04 de | 0.42 ± 0.09 e | 2.3 ± 0.6 c | 6.33 ± 0.5 de | 2.7 ± 0.7 de | 6.67 ± 0.7 de | |
50 | 0.19 ± 0.08 d | 0.32 ± 0.11 f | 0.17 ± 0.05 de | 0.32 ± 0.14 f | 2.0 ± 0.5 cd | 4.67 ± 0.7 f | 2.7 ± 0.8 de | 5.00 ± 0.5 f | |
Methyl Jasmonate + Melatonin (ppm) | 10 | 0.16 ± 0.07 de | 0.31 ± 0.13 f | 0.16 ± 0.07 e | 0.31 ± 0.15 f | 2.0 ± 0.7 cd | 4.00 ± 0.5 fg | 2.3 ± 0.7 e | 5.00 ± 0.4 f |
20 | 0.14 ± 0.05 e | 0.27 ± 0.08 g | 0.14 ± 0.03 e | 0.25 ± 0.09 g | 1.3 ± 0.5 e | 2.67 ± 0.6 h | 1.7 ± 0.3 f | 3.33 ± 0.6 g | |
50 | 0.10 ± 0.04 f | 0.16 ± 0.07 h | 0.11 ± 0.05 f | 0.14 ± 0.05 h | 1.0 ± 0.4 e | 2.00 ± 0.4 i | 1.0 ± 0.4 g | 2.00 ± 0.5 h |
Treatment | Days after Harvest | ||||
---|---|---|---|---|---|
14 | 28 | 14 | 28 | ||
2020 | 2021 | ||||
Control | 5.4 ± 0.20 d | 4.4 ± 0.11 e | 5.2 ± 0.19 d | 4.1 ± 0.17 f | |
Methyl Jasmonate (ppm) | 10 | 5.8 ± 0.17 c | 5.0 ± 0.13 d | 5.6 ± 0.16 c | 5.0 ± 0.14 e |
20 | 5.9 ± 0.14 bc | 5.3 ± 0.16 cd | 5.7 ± 0.17 c | 5.1 ± 0.12 e | |
50 | 6.0 ± 0.19 b | 5.5 ± 0.14 c | 5.7 ± 0.14 c | 5.2 ± 0.17 de | |
Melatonin (ppm) | 10 | 5.9 ± 0.13 bc | 5.3 ± 0.16 cd | 5.8 ± 0.13 bc | 5.3 ± 0.14 d |
20 | 6.0 ± 0.10 b | 5.5 ± 0.17 c | 5.8 ± 0.20 bc | 5.4 ± 0.15 cd | |
50 | 6.1 ± 0.15 ab | 5.7 ± 0.14 b | 5.9 ± 0.18 b | 5.5 ± 0.15 c | |
Methyl Jasmonate + Melatonin (ppm) | 10 | 6.0 ± 0.16 b | 5.6 ± 0.16 bc | 5.9 ± 0.15 b | 5.6 ± 0.18 bc |
20 | 6.1 ± 0.18 ab | 5.9 ± 0.19 ab | 6.0 ± 0.17 ab | 5.7 ± 0.13 b | |
50 | 6.3 ± 0.20 a | 6.0 ± 0.20 a | 6.1 ± 0.21 a | 5.9 ± 0.20 a |
Treatment | Days after Harvest | ||||||
---|---|---|---|---|---|---|---|
0 | 14 | 28 | 0 | 14 | 28 | ||
2020 | 2021 | ||||||
Control | 27.8 ± 0.3 h | 29.5 ± 1.0 f | 31.8 ± 0.6 e | 28.0 ± 0.5 i | 29.8 ± 0.7 f | 31.9 ± 0.7 e | |
Methyl Jasmonate (ppm) | 10 | 28.7 ± 0.7 g | 30.7 ± 0.9 e | 32.8 ± 0.5 d | 28.9 ± 0.7 h | 30.8 ± 0.5 e | 32.8 ± 0.9 d |
20 | 30.4 ± 1.0 f | 32.2 ± 1.1 d | 34.2 ± 0.9 c | 30.6 ± 0.8 g | 32.3 ± 0.6 d | 34.2 ± 0.7 c | |
50 | 31.7 ± 0.9 e | 33.5 ± 0.9 c | 35.1 ± 0.7 abc | 31.8 ± 0.6 f | 33.6 ± 0.6 c | 35.2 ± 0.9 bc | |
Melatonin (ppm) | 10 | 32.3 ± 0.6 d | 33.6 ± 0.7 bc | 34.5 ± 0.8 bc | 32.3 ± 0.8 e | 33.7 ± 0.7 c | 34.6 ± 1.0 c |
20 | 32.8 ± 0.8 cd | 33.7 ± 0.5 bc | 34.6 ± 0.9 bc | 32.8 ± 0.9 de | 33.8 ± 1.1 c | 34.7 ± 0.8 c | |
50 | 33.1 ± 0.7 c | 34.2 ± 0.5 bc | 35.1 ± 1.0 bc | 33.2 ± 1.1 cd | 34.3 ± 1.0 bc | 35.2 ± 0.8 bc | |
Methyl Jasmonate + Melatonin (ppm) | 10 | 33.4 ± 1.0 bc | 34.6 ± 0.6 bc | 35.5 ± 0.7 b | 33.5 ± 1.0 bc | 34.6 ± 0.9 bc | 35.6 ± 0.6 b |
20 | 33.8 ± 1.1 b | 34.7 ± 0.8 b | 35.3 ± 0.8 bc | 33.9 ± 0.7 b | 34.8 ± 0.8 b | 35.4 ± 0.9 bc | |
50 | 34.4 ± 0.9 a | 35.3 ± 0.9 a | 36.0 ± 0.9 a | 34.6 ± 1.0 a | 35.4 ± 1.0 a | 36.0 ± 0.8 a |
Treatment | Days after Harvest | ||||||
---|---|---|---|---|---|---|---|
0 | 14 | 28 | 0 | 14 | 28 | ||
2020 | 2021 | ||||||
Control | 24.4 ± 0.4 g | 26.4 ± 0.8 g | 25.5 ± 0.4 h | 24.4 ± 0.6 g | 26.5 ± 0.7 g | 25.4 ± 0.6 h | |
Methyl Jasmonate (ppm) | 10 | 25.7 ± 0.8 f | 27.3 ± 0.7 f | 26.4 ± 0.8 g | 25.7 ± 0.8 f | 27.3 ± 0.8 f | 26.5 ± 0.5 g |
20 | 25.8 ± 0.7 f | 27.9 ± 0.6 f | 27.0 ± 0.5 g | 25.8 ± 0.9 f | 27.9 ± 0.5 ef | 27.1 ± 0.7 g | |
50 | 27.0 ± 0.9 e | 29.0 ± 0.9 e | 28.3 ± 0.6 f | 27.0 ± 0.7 e | 28.7 ± 0.5 e | 28.0 ± 0.6 f | |
Melatonin (ppm) | 10 | 28.7 ± 0.6 d | 30.6 ± 0.4 d | 29.7 ± 0.6 e | 28.7 ± 0.7 d | 30.7 ± 0.7 d | 29.7 ± 0.5 e |
20 | 29.8 ± 1.0 c | 31.4 ± 0.8 c | 30.2 ± 1.0 de | 29.8 ± 0.9 c | 31.4 ± 1.0 cd | 30.3 ± 0.9 de | |
50 | 30.2 ± 1.0 bc | 32.1 ± 1.0 bc | 30.8 ± 0.9 cd | 30.2 ± 0.8 bc | 32.1 ± 0.7 bc | 30.8 ± 1.0 cd | |
Methyl Jasmonate + Melatonin (ppm) | 10 | 30.5 ± 0.8 bc | 32.4 ± 0.9 b | 31.4 ± 1.0 bc | 30.5 ± 0.7 bc | 32.4 ± 0.6 b | 31.5 ± 1.0 bc |
20 | 30.9 ± 0.9 ab | 32.7 ± 1.1 b | 31.9 ± 1.0 ab | 30.9 ± 1.0 b | 32.7 ± 0.9 ab | 31.9 ± 0.9 ab | |
50 | 31.6 ± 1.1 a | 33.4 ± 1.0 a | 32.4 ± 0.9 a | 31.7 ± 1.0 a | 33.5 ± 0.9 a | 32.5 ± 1.1 a |
Treatment | Days after Harvest | ||||||
---|---|---|---|---|---|---|---|
0 | 14 | 28 | 0 | 14 | 28 | ||
2020 | 2021 | ||||||
Control | 0.33 ± 0.07 a | 0.32 ± 0.06 a | 0.31 ± 0.06 a | 0.34 ± 0.05 a | 0.33 ± 0.08 a | 0.31 ± 0.07 a | |
Methyl Jasmonate (ppm) | 10 | 0.30 ± 0.03 b | 0.29 ± 0.05 b | 0.28 ± 0.07 b | 0.32 ± 0.06 b | 0.31 ± 0.05 b | 0.29 ± 0.06 b |
20 | 0.28 ± 0.03 c | 0.26 ± 0.07 c | 0.26 ± 0.05 c | 0.30 ± 0.05 c | 0.29 ± 0.05 c | 0.27 ± 0.05 c | |
50 | 0.26 ± 0.05 c | 0.25 ± 0.06 c | 0.24 ± 0.05 d | 0.28 ± 0.07 d | 0.27 ± 0.06 d | 0.24 ± 0.07 d | |
Melatonin (ppm) | 10 | 0.23 ± 0.04 d | 0.21 ± 0.05 d | 0.20 ± 0.06 e | 0.25 ± 0.05 e | 0.24 ± 0.04 e | 0.21 ± 0.04 e |
20 | 0.22 ± 0.06 de | 0.20 ± 0.04 de | 0.19 ± 0.05 e | 0.24 ± 0.06 ef | 0.23 ± 0.04 ef | 0.20 ± 0.04 e | |
50 | 0.21 ± 0.05 ef | 0.20 ± 0.06 de | 0.18 ± 0.06 ef | 0.22 ± 0.04 fg | 0.21 ± 0.05 fg | 0.20 ± 0.06 e | |
Methyl Jasmonate + Melatonin (ppm) | 10 | 0.20 ± 0.05 ef | 0.19 ± 0.05 ef | 0.17 ± 0.04 fg | 0.22 ± 0.05 fg | 0.20 ± 0.04 g | 0.19 ± 0.03 ef |
20 | 0.19 ± 0.06 fg | 0.18 ± 0.04 fg | 0.17 ± 0.05 fg | 0.21 ± 0.05 gh | 0.19 ± 0.06 gh | 0.18 ± 0.04 fg | |
50 | 0.18 ± 0.07 g | 0.17 ± 0.04 g | 0.16 ± 0.04 g | 0.19 ± 0.03 h | 0.18 ± 0.05 h | 0.17 ± 0.04 g |
RCC | N | P | K | YPP | BW | FL | FD | TSS | TS | TA | WL | FDC | FF | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
RCC | 1 | |||||||||||||
N | 0.93 *** | 1 | ||||||||||||
P | 0.98 *** | 0.90 *** | 1 | |||||||||||
K | 0.99 *** | 0.95 *** | 0.97 *** | 1 | ||||||||||
YPP | 0.96 *** | 0.98 *** | 0.95 *** | 0.97 *** | 1 | |||||||||
BW | 0.97 *** | 0.94 *** | 0.98 *** | 0.97 *** | 0.97 *** | 1 | ||||||||
FL | 0.99 *** | 0.94 *** | 0.97 *** | 0.99 *** | 0.97 *** | 0.98 *** | 1 | |||||||
FD | 0.98 *** | 0.96 *** | 0.95 *** | 0.99 *** | 0.98 *** | 0.97 *** | 0.99 *** | 1 | ||||||
TSS | 0.75 *** | 0.74 *** | 0.81 *** | 0.77 *** | 0.80 *** | 0.82 *** | 0.76 *** | 0.77 *** | 1 | |||||
TS | 0.97 *** | 0.90 *** | 0.98 *** | 0.96 *** | 0.94 *** | 0.96 *** | 0.97 *** | 0.95 *** | 0.83 *** | 1 | ||||
TA | −0.93 *** | −0.86 *** | −0.96 *** | −0.91 *** | −0.91 *** | −0.95 *** | −0.93 *** | −0.91 *** | −0.87 *** | −0.97 *** | 1 | |||
WL | −0.38 ** | −0.37 ** | −0.37 ** | −0.39 ** | −0.39 ** | −0.39 ** | −0.37 ** | −0.39 ** | −0.39 ** | −0.36 ** | 0.38 ** | 1 | ||
FDC | −0.43 *** | −0.40 ** | −0.45 *** | −0.43 *** | −0.43 *** | −0.44 *** | −0.42 *** | −0.43 *** | −0.44 *** | −0.43 *** | 0.47 *** | 0.87 *** | 1 | |
FF | 0.40 ** | 0.37 ** | 0.43 *** | 0.39** | 0.40 ** | 0.41 ** | 0.39 ** | 0.38 ** | 0.44 *** | 0.42 *** | −0.47 *** | −0.84 *** | −0.95 *** | 1 |
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Fekry, W.M.E.; Rashad, Y.M.; Alaraidh, I.A.; Mehany, T. Exogenous Application of Melatonin and Methyl Jasmonate as a Pre-Harvest Treatment Enhances Growth of Barhi Date Palm Trees, Prolongs Storability, and Maintains Quality of Their Fruits under Storage Conditions. Plants 2022, 11, 96. https://doi.org/10.3390/plants11010096
Fekry WME, Rashad YM, Alaraidh IA, Mehany T. Exogenous Application of Melatonin and Methyl Jasmonate as a Pre-Harvest Treatment Enhances Growth of Barhi Date Palm Trees, Prolongs Storability, and Maintains Quality of Their Fruits under Storage Conditions. Plants. 2022; 11(1):96. https://doi.org/10.3390/plants11010096
Chicago/Turabian StyleFekry, Waleed M. E., Younes M. Rashad, Ibrahim A. Alaraidh, and Taha Mehany. 2022. "Exogenous Application of Melatonin and Methyl Jasmonate as a Pre-Harvest Treatment Enhances Growth of Barhi Date Palm Trees, Prolongs Storability, and Maintains Quality of Their Fruits under Storage Conditions" Plants 11, no. 1: 96. https://doi.org/10.3390/plants11010096