Our symbionts, ourselves One Plus One Equals One – Symbiosis and the Evolution of Complex Life John Archibald (Oxford University Press, Oxford, UK; 2014) ISBN: 978-0-19-966059-9
نویسنده
چکیده
How do these plants process their prey? The entrapped struggling animal repeatedly touches the mechanosensors, thus triggering trains of action potentials. This mechano-electrical stimulation of the trap initiates the synthesis of jasmonate-type touch hormones, causing the closed trap to seal hermetically and to flood the forming green stomach with a lytic enzyme cocktail. The insect flesh is covered by a chitin shell, but hydrolases in the green stomach of Dionaea degrade the chitin polymer coat (chitinases), as well as proteins, nucleic acids, glycans and lipids from the prey into their respective monomers and dissociate the nitrogen, phosphate and sulphate side groups. The latter, together with minerals such as potassium, are the macronutrients required for plant growth, which in noncarnivorous plants are usually taken up from the soil by transport proteins in the roots of the plant. Interestingly, when in contact with trapped animals, traps express and operate root-type transporters to efficiently absorb preyderived nutrients. Dionaea gland cell transporters shuttle nutrients released by the decomposition of the animal food. In doing so, the Dionaea glands are able to take advantage of the steep proton gradient that powers protondriven solute transporters, so mining the animal food source to the trace level.
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عنوان ژورنال:
- Current Biology
دوره 25 شماره
صفحات -
تاریخ انتشار 2015