Role of acetylcholine on plant root-shoot signal transduction

Chinese Science Bulletin (Impact Factor: 1.37). 01/2003; 48(6):570-573. DOI: 10.1360/03tb9121

ABSTRACT The role of acetylcholine (ACh) on plant rootshoot communication was investigated using the root-split system of Vicia faba L. In the experiments, slight osmotic stress caused the decrease of ACh content in root tips and the xylem sap transported
up per time unit from root tip to the shoot when the water potential of the shoot was kept unchanged. It also caused the decrease
of ACh content in the abaxial epidermis. The decrease was highly correlative to the changes of transpiration rate, suggesting
that the decrease of ACh content probably functions as a signal to regulate stomatal behavior. The effect of osmotic stress
might be mainly through the inhibition of the ACh synthesis in root tip; thus further influences the ACh content in root tip,
xylem sap and abaxial epidermis and resulting in the changes of stomatal behavior. These results provide new evidence that
plants transduce positive and negative signals among roots and shoots to coordinate stomatal behavior and adapt to variable


Available from: Hengbin Wang, Nov 19, 2014
1 Follower
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The interactions of fungi and chemical messenger molecules, hormones or pheromones, are addressed in this chapter. These interactions include mammalian fungal pathogens, also plant pathogens, or nonpathogenic fungi, which can result in functional responses in receptor- or nonreceptor-mediated fashions. Endogenous ligands in the fungi have been demonstrated to be important for mating in a number of systems. Mammalian hormones have been demonstrated to have stimulatory or inhibitory effects on growth in organisms such as Candida albicans, Paracoccidioides brasiliensis, Saccharomyces cerevisiae, Rhizopus nigricans, Aspergillus fumigatus, Coccidioides, and dermatophytic fungi. A number of fungi have been shown to have specific binding proteins for corticosteroid, estrogen, and progesterone that are stereospecific and possess high affinity. In some instances, the interactions of a mammalian hormone with the organism, in vivo, affects pathogenesis. Genome expression profiles of C. albicans in the presence of estradiol or progesterone, and S. cerevisiae with progesterone, indicate major up-regulation of various drug resistance pumps, such as CDR1 and CDR2, can affect antifungal susceptibility. Azole antifungal interactions occur with fungal hormone binding proteins. Azoles also can block mammalian steroidogenesis. The finding of the interactions of mammalian hormones with fungi and subsequent functional responses by the fungi, suggest that hormonal interactions with fungal systems have been conserved throughout evolution and have an important role in fungal pathogenesis, as well as in the overall biology of the organisms.
    06/2010: pages 269-290;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The development of Microbial Endocrinology is covered from a decidedly personal perspective. Specific focus is given to the role of Microbial Endocrinology in the evolutionary symbiosis between man and microbe as it relates to both health and disease. Future avenues of research are suggested.
    04/2010: pages 1-16;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We investigated the effect of auxin and acetylcholine on the expression of the tomato expansin gene LeEXPA2, a specific expansin gene expressed in elongating tomato hypocotyl segments. Since auxin interferes with clathrin-mediated endocytosis, in order to regulate cellular and developmental responses we produced protoplasts from tomato elongating hypocotyls and followed the endocytotic marker, FM4-64, internalization in response to treatments. Tomato protoplasts were observed during auxin and acetylcholine treatments after transient expression of chimerical markers of volume-control related compartments such as vacuoles. Here we describe the contribution of auxin and acetylcholine to LeEXPA2 expression regulation and we support the hypothesis that a possible subcellular target of acetylcholine signal is the vesicular transport, shedding some light on the characterization of this small molecule as local mediator in the plant physiological response.
    International Journal of Molecular Sciences 03/2014; 15(3):4565-4582. DOI:10.3390/ijms15034565 · 2.34 Impact Factor