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Role of plant enzymes and phytochemical components on the susceptibility of some tomato varieties to the tomato borer, Tuta absoluta infestation in Egypt
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| Author:
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EMAN KH.AMIN, GAMAL M.HASSAN, TALAAT E.EMARA, SAKR H.H
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| Abstract:
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The susceptibility of the tomato varieties to T. absoluta infestation and its relation with some leaf phytochemical components as phenols, flavonoids, proteins, carbohydrates, and free amino acids as well as some leaf enzymes such as phenoloxidase, peroxidase and Glutathione S-transferase were studied. The five investigated tomato varieties were cultivated on the 15th March during two successive summer seasons, 2018 and 2019 to classify the susceptibility of the tested tomato varieties depending on the general mean numbers of T. absoluta infestation (X¯) and the standard deviation (SD).
In the present study, three degrees of susceptibility were observed during both of the two tested seasons; susceptible (S) in 130, T306 and Super Hagen varieties; low resistance (LR) in 586 variety and moderate resistance (MR) in 585 varieties. The mean numbers of eggs, larvae and adults of T. absoluta significantly affected. Present results indicated that the lowest level of enzyme was found in T306 variety (Phenoloxidase) and in 130 variety (peroxidase). Moreover, the 586 variety contained the highest amount of peroxidase and Glutathione S-transferase GST enzymes. Additionally, the increasing of the T. absoluta infestation rates was correlated with the three tested enzyme contents in tomato leaves.
The tomato variety, 585 had a moderate resistance against T. absoluta infestation, as it had high levels of total phenols and flavonoids. Moreover, this tomato variety had low levels of total proteins, carbohydrates and free amino acids. The components of total phenols, flavonoids (phytochemical contents) and peroxidase and GST enzymes were highly affected the infestation rates of T. absoluta stages on the five tested tomato varieties.
The variability of T. absoluta plant tomato infestations interactions depends on the leaf phytochemical compounds and plant enzymes. These constituents might act as antifeeding and/or repellent components in leaves of tomato varieties against tomato borer. Accordingly, these results may be helpful to evaluate good IPM elements against T. absoluta on tomato varieties during summer plantation in Egypt.
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| Keyword:
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Tuta absoluta, phytochemical components, enzymes, phenoloxidase, peroxidase, Glutathione S-transferase, susceptibility, Solanum lycopersicum, tomato borer, infestation.
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| EOI:
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| DOI:
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https://doi.org/10.31838/ijpr/2021.13.02.427
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| Download:
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