title: Defence responses regulated by jasmonate and delayed senescence caused by ethylene receptor mutation contribute to the tolerance of petunia to Botrytis cinerea.
abstract: Ethylene and jasmonate (JA) have powerful effects when plants are challenged by pathogens. The inducible promoter-regulated expression of the Arabidopsis ethylene receptor mutant ethylene-insensitive1-1 (etr1-1) causes ethylene insensitivity in petunia. To investigate the molecular mechanisms involved in transgenic petunia responses to Botrytis cinerea related to the ethylene and JA pathways, etr1-1-expressing petunia plants were inoculated with Botrytis cinerea. The induced expression of etr1-1 by a chemical inducer dexamethasone resulted in retarded senescence and reduced disease symptoms on detached leaves and flowers or intact plants. The extent of decreased disease symptoms correlated positively with etr1-1 expression. The JA pathway, independent of the ethylene pathway, activated petunia ethylene response factor (PhERF) expression and consequent defence-related gene expression. These results demonstrate that ethylene induced by biotic stress influences senescence, and that JA in combination with delayed senescence by etr1-1 expression alters tolerance to pathogens.
authors: College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China.
authors: Hong
authors: H
authors: Wang
authors: Gang
authors: G
authors: Liu
authors: Chunxia
authors: C
authors: Li
authors: Ann L T
authors: AL
authors: Powell
authors: Michael S
authors: MS
authors: Reid
authors: Zhen
authors: Z
authors: Zhang
authors: Cai-Zhong
authors: CZ
authors: Jiang
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects* / Q000235:genetics; D020171:Botrytis / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D003517:Cyclopentanes / Q000494:pharmacology*; D003907:Dexamethasone / Q000494:pharmacology; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D008954:Models, Biological; D009154:Mutation / Q000235:genetics*; D054883:Oxylipins / Q000494:pharmacology*; D032306:Petunia / Q000187:drug effects / Q000254:growth & development / Q000276:immunology* / Q000382:microbiology*; D010641:Phenotype; D010935:Plant Diseases / Q000276:immunology / Q000382:microbiology; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D030821:Plants, Genetically Modified; D011956:Receptors, Cell Surface / Q000235:genetics* / Q000378:metabolism
chemical_list: D003517:Cyclopentanes; D054883:Oxylipins; D010940:Plant Proteins; D011956:Receptors, Cell Surface; C083750:ethylene receptors, plant; C011006:jasmonic acid; D003907:Dexamethasone; D004121:Dimethyl Sulfoxide