Increased growth in sunflower correlates with reduced defences and altered gene expression in response to biotic and abiotic stress

Maya Mayrose, Nolan C. Kane, Itay Mayrose, Katrina M. Dlugosch, Loren H. Rieseberg

Research output: Research - peer-reviewArticle

  • 2 Citations

Abstract

Cultivated plants have been selected by humans for increased yield in a relatively benign environment, where nutrient and water resources are often supplemented, and biotic enemy loads are kept artificially low. Agricultural weeds have adapted to this same benign environment as crops and often have high growth and reproductive rates, even though they have not been specifically selected for yield. Considering the competing demands for resources in any plant, a key question is whether adaptation to agricultural environments has been accompanied by life history trade-offs, in which resistance to (largely absent) stress has been lost in favour of growth and reproduction. The experiments reported here were designed to test for growth-defence trade-offs in agricultural weeds, crops and native varieties of common sunflower (Helianthus annuus L., Asteraceae) by comparing their performance in the presence or absence of abiotic (drought and crowding) or biotic (simulated herbivory, insect herbivory and fungal) stress. We found that growth, as well as viability of crops and weeds, was reduced by abiotic drought stress. The weakened defence in the agricultural genotypes was further evident as increased susceptibility to fungal infection and higher level of insect palatability. To uncover molecular mechanisms underlying these trade-offs, we monitored gene expression kinetics in drought-stressed plants. By correlating phenotypic observations with molecular analyses, we report the identification of several genes, including a protein phosphatase 2C and the HD-Zip transcription factor Athb-8, whose expression is associated with the observed phenotypic variation in common sunflower.

LanguageEnglish (US)
JournalMolecular Ecology
DOIs
StateAccepted/In press - 1800
Externally publishedYes

Fingerprint

biotic stress
abiotic stress
Helianthus annuus
weeds
gene expression
crops
defence
Gene expression
Correlates
Helianthus
Gene Expression
Growth
weed
crop
Drought
Trade-offs
Crops
Weeds
Droughts
herbivores

Keywords

  • Agricultural weeds
  • Defence responses
  • Domestication
  • Gene expression
  • Sunflower

ASJC Scopus subject areas

  • Organic Chemistry
  • Inorganic Chemistry
  • Cell Biology
  • Periodontics
  • Management Science and Operations Research
  • Strategy and Management
  • Genetics
  • Ecology, Evolution, Behavior and Systematics

Cite this

Increased growth in sunflower correlates with reduced defences and altered gene expression in response to biotic and abiotic stress. / Mayrose, Maya; Kane, Nolan C.; Mayrose, Itay; Dlugosch, Katrina M.; Rieseberg, Loren H.

In: Molecular Ecology, 1800.

Research output: Research - peer-reviewArticle

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