Back to Search
Start Over
Aphid fecundity and defenses in wheat exposed to a combination of heat and drought stress
- Source :
- Journal of Experimental Botany
- Publication Year :
- 2020
- Publisher :
- Oxford University Press (OUP), 2020.
-
Abstract
- Combined heat and drought stress can enhance phytohormone-dependent defenses of wheat against aphids and decrease aphid fitness, providing new insights on plant–insect interactions under conditions of complex stress.<br />Plants are routinely subjected simultaneously to different abiotic and biotic stresses, such as heat, drought, and insect infestation. Plant–insect interactions in such complex stress situations are poorly understood. We evaluated the performance of the grain aphid (Sitobion avenae) in wheat (Triticum aestivum L.) exposed to a combination of heat and drought stresses. We also performed assays of the relative water content, nutritional quality, and responses of phytohormone signaling pathways. Lower relative water content and accumulation of soluble sugars and amino acids were observed in plants exposed to combined heat and drought stress. These conditions increased abscisic acid levels in the absence of aphids, as well as leading to higher levels of jasmonate-dependent transcripts. The grain aphid infestation further increased abscisic acid levels and the abundance of jasmonic acid- and salicylic acid-dependent defenses under the combined stress conditions. Aphids reared on plants grown under drought stress alone showed lower net reproductive rates, intrinsic rates of increase, and finite rates of increase compared with aphids reared on plants in the absence of stress. The heat-treated plants also showed a decreased aphid net reproductive rate. These findings demonstrate that exposure to a combination of stresses enhances plant defense responses against aphids as well as altering nutritional quality.
- Subjects :
- Triticum aestivum L
0106 biological sciences
0301 basic medicine
Hot Temperature
Sitobion avenae
Physiology
Plant Science
medicine.disease_cause
01 natural sciences
resistance
03 medical and health sciences
chemistry.chemical_compound
Infestation
Plant defense against herbivory
medicine
Animals
Abscisic acid
Triticum
Abiotic component
Aphid
Drought
biology
AcademicSubjects/SCI01210
Jasmonic acid
fungi
food and beverages
biochemical phenomena, metabolism, and nutrition
Fecundity
biology.organism_classification
Research Papers
Droughts
phytohormones
Horticulture
Fertility
030104 developmental biology
chemistry
Plant—Environment Interactions
Aphids
heat
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14602431 and 00220957
- Volume :
- 71
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Botany
- Accession number :
- edsair.doi.dedup.....1c7d1f18a3fbb327418aaa99d155085e