Molecular profiling of the Mahanarva spectabilis salivary glands and phytohormonal response of elephant grass

Signal perception in plants is determinant to trigger specific physiological changes that confer resistance during the early stages of the insect attack. Thus, molecular characterization of both insect effectors and plant hormonal regulators are essential in developing forage grasses resistant to in...

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Published in:International journal of tropical insect science 2021-03, Vol.41 (1), p.849-860
Main Authors: Saraiva, Nayara B., Emidio, Nayara B., Vital, Camilo E., Gusmão, Michélia A. N., Marconato, Danielle G., Coutinho, Flaviane Silva, Pereira, Jorge Fernando, Auad, Alexander Machado, Faria-Pinto, Priscila, Ramos, Humberto J. O., Oliveira, Maria Goreti Almeida
Format: Article
Language:English
Subjects:
Abscisic acid
Biomedical and Life Sciences
Crosstalk
Effectors
Elephant grass
Entomology
Fatty acids
Grasses
Herbivores
Infestation
Insects
Jasmonic acid
Life Sciences
Mahanarva spectabilis
Original Research Article
Pennisetum purpureum
Plant hormones
Regulators
Salicylic acid
Salivary gland
Salivary glands
Zeatin
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Summary:Signal perception in plants is determinant to trigger specific physiological changes that confer resistance during the early stages of the insect attack. Thus, molecular characterization of both insect effectors and plant hormonal regulators are essential in developing forage grasses resistant to infestation by spittlebug Mahanarva spectabilis . We evaluated the presence of effectors in the salivary glands of M. spectabilis that could enable the infestation of elephant grass ( Pennisetum purpureum ). The presence of an NTPDase-like enzyme was confirmed, and higher activity was observed in females that hydrolyzed ADP. High levels of long chain fatty acids, such as octadecanoid acid (19.5%), prostaglandin A2 (4.7%), eicosanoid acid and the phytohormone salicylic acid (~4.0 μg/g) were also detected in the salivary glands. After 24 h of infestation, the phytohormone profiles were altered in leaves damaged by M. spectabilis , suggesting that the insect effectors modulate the plant response. Our results suggest that the plant response modulation may be the result of crosstalk between the salicylic acid, jasmonic acid, abscisic acid and zeatin pathways, induced by molecules from the salivary glands. This shows that the spittlebugs can interfere with jasmonic acid and zeatin accumulation in elephant grass plants.
ISSN:1742-7592
1742-7584
1742-7592
DOI:10.1007/s42690-020-00275-9