The effects of auxin transport inhibitors on gravitropism in protonemata of the moss Pohlia nutans (Hedw.)

1Khorkavtsiv, Ya.D, 2Demkiv, ОТ
1Institute of Ecology of the Carpathians of the National Academy of Sciences of Ukraine, L’viv, Ukraine
2Institute of Ecology of the Carpathians of the National Academy of Sciences of Ukraine, L'viv, Ukraine
Kosm. nauka tehnol. 2003, 9 ;(2-3):077-082
Publication Language: Ukrainian
Gravitropism of the protonemata of the moss Pohlia nutans (Hedw.) is studied after the treatment with auxin transport inhibitors and auxin-related substances. The phytotropin NPA (naphthylphthalamic acid) known to block auxin efflux in higher plants inhibited gravitropic curvature of apical protonemal cells. The auxin 1-NAA (N-1-naphtylphthalamic acid) did not impair gravitropism of protonemata but reduced the inhibitory effect of NPA. IAA (indole-3-acetic acid), even at high concentrations, did not interfere with protonemal gravitropism. In line with our results, the auxin transport and action in a unicellular graviresponse system are discussed.
Keywords: auxin transport, gravitropism, inhibitors
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