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Latex in plant defence

The power to manipulate latex. Variation of Rubber Manipulation. The user can create, shape and manipulate latex , a stable dispersion emulsion of polymer microparticles in an aqueous medium. It is found in nature, but synthetic latexes can be made by polymerizing a monomer such as styrene that has been emulsified with surfactants. It is a complex emulsion consisting of proteins, alkaloids, starches, sugars, oils, tannins, resins, and gums that coagulate on exposure to air. It is usually exuded after tissue injury.
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Plants use latex to harm and heal

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Arabidopsis Transcriptome Analysis Reveals Key Roles of Melatonin in Plant Defense Systems

Here we report on new experiments on the heritability and inducibility of latex in several milkweed species. In addition, we review what is known about the genetic and environmental determinants of latex exudation, hormonal regulation, evolution within and among species, and the role and frequency of latex in agricultural crops. All species showed substantial genetic variation for latex exudation and six of seven species responded to monarch herbivory two species increased latex, two species decreased, and two showed variation among genetic families. Exogenous application of jasmonic acid JA to three species induced a consistent increase in latex including species which showed a decline following caterpillar herbivory.
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Why Don't Monarchs Get Sick From Eating Milkweed?

Milkweed contains toxins, which makes the monarch butterfly unpalatable to most predators. The monarchs even use aposematic coloration to warn predators that they will be eating a toxic meal, should they choose to prey on the orange and black butterfly. But if milkweed is so toxic, why don't the monarchs get sick from eating milkweed?
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Here we report on new experiments on the heritability and inducibility of latex in several milkweed species. In addition, we review what is known about the genetic and environmental determinants of latex exudation, hormonal regulation, evolution within and among species, and the role and frequency of latex in agricultural crops. All species showed substantial genetic variation for latex exudation and six of seven species responded to monarch herbivory two species increased latex, two species decreased, and two showed variation among genetic families.
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