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Effects of Lanthanides on Potassium Channels in Guard Cells and Mesophyll Cells and on Stomatal and Transpiration Regulation

Author: XueShaoWu
Tutor: YangPin
School: Shanxi University
Course: Inorganic Chemistry
Keywords: Rare earths Guard cells Mesophyll cells Potassium channel Patch clamp
CLC: S143.7
Type: PhD thesis
Year: 2005
Downloads: 282
Quote: 3
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Abstract


Rare Earths in China's agricultural, industrial, medical and animal husbandry have a wide range of applications. Rare Earth on organisms have special physiological functions and biological effects, including the promotion of crop production, promote seed germination and seedling growth and other biological effects, so rare in our agricultural fertilizer widely used. Water shortage is a plant growth process frequently encountered in the face of adversity, one of the world's food production due to drought cut production losses caused by all the other losses caused by disasters combined. Stomata of plant gas exchange with the external environment of the portal, which regulates the opening and closing movement of photosynthesis (absorb CO 2 ) and transpiration (water discharge). Guard cells and mesophyll plasma membrane ion channel activity and stomatal movement have a close relationship, K ion cells and mesophyll cells is to defend the major osmolytes, so explore the guard cells and mesophyll cell membrane on K channel activity and stomatal movement, the relationship between transpiration have significance. In this paper, the whole-cell patch-clamp recording mode of several rare earth ions on Vicia faba guard cells and mesophyll cell plasma membrane K channels in the use of bio-analytical methods such as the epidermis of rare earth ions on stomatal movement, transpiration effect, trying to reveal the Earth in regulating plant water loss has potential applications. Experimental results are as follows: rare earth ions La 3 in the cell membrane on guard cell plasma membrane (K ) in channels and outward (K ) out channel currents are a disincentive; within the cell membrane of the guard cell inward (K ) in channel currents from inhibition of guard cell outward (K ) out small concentration activated channel current performance, high concentrations of inhibition. Extracellular Eu 3 on the plasma membrane of guard cells (K ) in channels and outward (K ) out channel currents as small concentrations of active, high concentrations of suppression: Eu 3 concentration lt; 2mmol / L when the plasma membrane (K ) in current for activation, the concentration gt; 5mmol / L when the plasma membrane (K ) in current disincentive; Eu 3 concentration lt; 200μmol / L when the plasma membrane (K ) out current is to stimulate increased, Eu 3 concentration gt; 1mmol / L, the plasma membrane (K ) out current is suppressed reduced. Visible, different types of K of the same ion channel response is different. The extracellular Nd 3 at a concentration lt; 5mmol / L when the guard cell plasma membrane (K ) in and outgoing channels (K ) out -channel current size had no significant effect. La 3 in the cell membrane and the membrane of Vicia mesophyll cell membrane outward (K ) out channel currents are a disincentive; extracellular Eu 3 on mesophyll cell membrane outward (K ) out channel current mild

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CLC: > Agricultural Sciences > Agriculture as the foundation of science > FERTILIZERS > Chemical fertilizers > Trace element fertilizers
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