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- Hydraulic signals in plants are detected as changes in the organism's water potential that are caused by environmental stress like drought or wounding. The cohesion and tension properties of water allow for these water potential changes to be transmitted throughout the plant. Plants respond to external stimuli through thigmomorphogenesis. For example, bending a shoot can cause arrestment of growth on another area of the plant. These types of nonlocal responses can be induced by long distance signaling. Long distance communication in plants must satisfy two things: First, signaling must occur rapidly to an apical area of the plant; Second, the signal must be perceived at the apical site and be converted to a physiological or thigmorphogenetic response. One form of long distance signaling is through hydraulic pulses from the roots to the shoots of a plant. Tree branches and stems contain microchannels that make up the xylem network and serve to carry water longitudinally. Stimuli like wounding can cause tension and compression of plant tissues, which pinches the cross section of the shoot. Hydraulic signaling begins with a local response like water expulsion, creating a suction in the vascular system. The compression of the cross section will then lead to a general increase of hydraulic pressure in the channels of the shoot. This extensive change in hydraulic pressure will lead to activation of hydraulic sensors. (en)
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- 17656 (xsd:nonNegativeInteger)
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- Hydraulic signals in plants are detected as changes in the organism's water potential that are caused by environmental stress like drought or wounding. The cohesion and tension properties of water allow for these water potential changes to be transmitted throughout the plant. (en)
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- Hydraulic signaling in plants (en)
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