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- W2609011504 abstract "Resulting from the facts that sterilized, bacteria-free plants possess less extractable and diffusible auxin than nonsterile plants which are settled with epiphytic bacteria, and that the reinfection of sterilized plants with IAA-producing epiphytic bacteria restores the auxin content, the influence of epiphytic bacteria on some auxin dependent physiological reactions was investigated. In experiments with etiolated corn and cucumber seedlings and with green corn plants, coleoptile, mesocotyl and epicotyl length, fresh, dry and ash weight of the shoot parts of sterile plants were lower than the same parameters of nonsterile plants. In plants reinfected with IAA-producing epiphytic bacteria, all these parameters were higher than in sterile plants. Pea seedlings obviously were not affected by epiphytic bacteria. Opposite to the relations in shoot parts, length, fresh und dry weight of roots were lowered by IAA-producing epiphytic bacteria. This result underlines the assumption that the effects of the bacteria are mediated by their positive influence on the auxin level in the tissues. Isolated sections from sterile corn coleoptiles develop alower rate of elongations than sections from nonsterile coleoptiles, the same is true with sections from pea epicotyls. Sections of reinfected coleoptiles have the same rate of elongation as nonsterile sections. Treating the coleoptiles with IAA previous to section isolation has the same effect as the reinfection with IAA-producing bacteria. Experiments with antibiotics exclude the possibility that the bacteria develop their effect by producing auxin in the test medium after section isolation; the superiority of the non-sterile and the reinfected sections must result from their higher auxin content at the moment of section isolation. The bacteria-induced increase of the elongation is discussed to be the cause of all the other effects of the bacteria mentioned above. After a geotropic stimulation, sterile and nonsterile corn coleoptiles develop the same degree of curvature. But the curvature degree is raised by treating the coleoptiles with IAA or with a concentrated suspension of IAA-producing epiphytic bacteria previous to geotropic stimulation. Adventitious root formation at corn seedlings is stimulated by abscising the main root but is not influenced by the epiphytic bacteria. Obviously, under natural conditions the auxin amount produced by the epiphytic bacteria is high enough to affect the most auxin sensitive one of the investigated processes, namely growth, but is not high enough to affect the less auxin sensitive ones, namely geotropic reactivity and root formation." @default.
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- W2609011504 date "1973-01-01" @default.
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- W2609011504 title "Beziehungen zwischen Pflanzen und epiphytischen Bakterien hinsichtlich ihres Auxinstoffwechsels" @default.
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- W2609011504 doi "https://doi.org/10.1016/s0015-3796(17)30703-5" @default.
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