Journal ArticleDOI
Electrical signalling and systemic proteinase inhibitor induction in the wounded plant
D. C. Wildon,J. F. Thain,P. E. H. Minchin,I. R. Gubb,A. J. Reilly,Y. D. Skipper,H. M. Doherty,P. J. O'Donnell,Dianna J. Bowles +8 more
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TLDR
It is shown that translocation in the phloem of tomato seedlings can be completely inhibited without effect on the systemic accumulation of pin transcripts and pin activity, and without hindrance to propagated electrical signals.Abstract:
THE wound response of several plant species involves the activation of proteinase inhibitor (pin) genes and the accumulation of pin proteins at the local site of injury and systemically throughout the unwounded aerial regions of the plant1,2. It has been suggested that a mobile chemical signal is the causal agent linking the local wound stimulus to the distant systemic response, and candidates such as oligosaccharides3, abscisic acid4 and a polypeptide5,6 have been put forward. But the speed of transmission is high for the transport of a chemical signal in the phloem. The wound response of tomato plants can be inhibited by salicylic acid7 and agents like fusicoccin that affect ion transport8, and wounding by heat9 or physical injury produces electrical activity that has similarities to the epithelial conduction system10 used to transmit a stimulus in the defence responses of some lower animals11. Here we design experiments to distinguish between a phloem-transmissible chemical signal and a physically propagated signal based on electrical activity. We show that translocation in the phloem of tomato seedlings can be completely inhibited without effect on the systemic accumulation of pin transcripts and pin activity, and without hindrance to propagated electrical signals.read more
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Insect-plant biology
TL;DR: The mechanisms underlying plant resistance to invading herbivores on the one side, and insect food specialization on the other, are the main subjects of this book.
Journal ArticleDOI
Biosynthesis and action of jasmonates in plants
TL;DR: Modulation of lipoxygenase and allene oxide synthase gene expression in transgenic plants raises new questions about the compartmentation of the biosynthetic pathway and its regulation.
Journal ArticleDOI
Systemic acquired resistance
TL;DR: The molecular events underlying SAR are discussed: the mechanisms involved in SAR, including lignification and other structural barriers, pathogenesis-related proteins and their expression, and the signals for SAR including salicylic acid.
Journal ArticleDOI
Differential Gene Expression in Response to Mechanical Wounding and Insect Feeding in Arabidopsis
TL;DR: A feeding strategy of P. rapae is revealed that may minimize the activation of a subset of water stress–inducible, defense-related genes that contribute to tissue defense and repair.
Journal ArticleDOI
Arabidopsis Mutants Selected for Resistance to the Phytotoxin Coronatine Are Male Sterile, Insensitive to Methyl Jasmonate, and Resistant to a Bacterial Pathogen.
TL;DR: It is concluded that coronatine mimics the action of MeJA and that coi1 controls a step in MeJA perception/response and in flower development.
References
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Journal ArticleDOI
Improved method for the isolation of RNA from plant tissues.
TL;DR: A fast and efficient method for the isolation of RNA from plant tissues is described, of particular use for isolating RNA from tissues with a high polysaccharide and nuclease content such as wounded potato tubers.
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Protease Inhibitors in Plants: Genes for Improving Defenses Against Insects and Pathogens
TL;DR: The inducible chemicals, which can also occur constitutively, include such complex sub stances as antibiotics, alkaloids, and terpenes, as well as proteins such as enzymes, enzyme inhibitors, and lectins, which have provided interesting systems for studying inducibles plant defense.
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Octadecanoid Precursors of Jasmonic Acid Activate the Synthesis of Wound-Inducible Proteinase Inhibitors.
TL;DR: The results suggest that the octadecanoid intermediates may participate in a lipid-based signaling system that activates proteinase inhibitor synthesis in response to insect and pathogen attack.
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Defense-related proteins in higher plants.
TL;DR: Proteins that Change the Properties of the Extracellular Matrix, Extensins: hydroxyproline-rich glycoproteins .
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A Polypeptide from Tomato Leaves Induces Wound-Inducible Proteinase Inhibitor Proteins
TL;DR: It is established that a polypeptide factor can initiate signal transduction to regulate the synthesis of defensive proteins in plant tissues.