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  • 1
    Electronic Resource
    Electronic Resource
    8-Epixanthatin, a light-induced growth inhibitor, mediates the phototropic curvature in sunflower (Helianthus annuus) hypocotyls (1999)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 106 (1999), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The distribution of the endogenous auxin-inhibiting substance, 8-epixanthatin, was determined in the lighted and shaded sides of phototropically-stimulated, de-etiolated sunflower (Helianthus annuus L. cv. Taiyo) hypocotyls. From 40 min after the onset of phototropic stimulation, the growth rate at the lighted side was inhibited, whereas that at the shaded side showed no change. In the lighted side, 8-epixanthatin increased by 20 min after the onset of unilateral illumination and, after 40 min, reached a 3-fold larger concentration than that in the shaded side. Unilateral application of 8-epixanthatin suppressed the growth of etiolated hypocotyls at the applied side only, causing the hypocotyls to bend at the site of application. It is concluded that phototropic curvature in sunflower hypocotyls is caused by a lateral gradient of the auxin-inhibiting substance 8-epixanthatin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.1999.106310.x
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  • 2
    Electronic Resource
    Electronic Resource
    An allelopathic substance exuded from germinating watermelon seeds (1998)
    Springer
    Plant growth regulation 25 (1998), S. 1-4 
    Details
    ISSN: 1573-5087
    Keywords: allelopathic substance ; allelopathy ; Citrullus vulgaris ; plant growth regulator ; plant-selective activity ; seed exudate ; vanillic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract When watermelon seeds were cultured in a Petri dish together with amaranth, barnyard grass, cockscomb, lettuce or tomato seeds, the shoot growth of amaranth and cockscomb was markedly promoted, whereas the shoot growth of lettuce and tomato was inhibited. The shoot growth of barnyard grass was not affected. These results suggest that plant-selective allelopathic substance(s) affecting the shoot growth of other plant seedlings were exuded from watermelon seeds. An allelopathic substance was isolated from the exudates of germinating watermelon seeds and identified as vanillic acid by its spectral analysis and Rf value on TLC. Vanillic acid promoted the shoot growth of cockscomb at the concentrations of 300 to 10 mg/l and that of amaranth at the concentrations of 30 to 3 mg/l, although the shoot growth of amaranth was inhibited by 300 mg/l of vanillic acid. The shoot growth of lettuce and tomato was inhibited at the concentrations higher than 30 mg/l by vanillic acid. However, the shoot growth of barnyard grass was not affected at the concentrations used. All these results suggest that vanillic acid may play as a major component of allelopathic substance(s), which shows plant-selective activity, in the exudates of germinating watermelon seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005907101778
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  • 3
    Electronic Resource
    Electronic Resource
    Exudation of an allelopathic substance lepidimoide from seeds during germination (1997)
    Springer
    Plant growth regulation 22 (1997), S. 189-192 
    Details
    ISSN: 1573-5087
    Keywords: allelopathic substance ; allelopathy ; buckwheat ; Fagopyrum esculentum ; growth-promoting substance ; Helianthus annuus ; kernel ; lepidimoide ; seed coat ; seed exudate ; seed germination ; sunflower
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Lepidimoide promotes growth of the cockscomb hypocotyl. It is exuded from germinating seeds of various plant species into their culture environment. The mode of exudation of lepidimoide from seeds into the culture solution, using sunflower and buckwheat seeds, was studied in relation to seed germination. In the dry seeds, about 75% of the lepidimoide was found in the seed coat and about 25% in the kernel. Upon water imbibition it was released into the culture solution. However, the quantity of lepidimoide detected in the seed exudate was more than three times the total amount in dry and imbibed seeds, suggesting that lepidimoide was also produced de novo in the seeds and subsequently released. When seed coats or kernels were imbibed separately, the quantity of lepidimoide released from the seed coats into the culture solution was much the same as that in the dry seeds, but the amount of lepidimoide detected in the exudate of kernels was about 16 times that in the dry kernels. These results suggest that lepidimoide, already present in dry seeds, as well as that newly produced in the kernels following imbibition, was released into the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005885218610
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