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- W2069567189 abstract "Caryopses of rice (Oryza sativa L. cultivar ‘Mercury’) were imbided for 2 days in water in the presence of a stream of nitrogen gas. Fully-imbibed caryopses were placed on plain 2% agar or on agar containing the phytotropin, N-l-naphthylphthalamic acid acid (NPA) at 5 μM in vertically-held Petri dishes in chambers in the dark at 29°C. Subsequent elongation growth of roots and coleoptiles, in air or in nitrogen gas, over a 36-h period, was determined, together with the angle of deviation from vertical of the apical 2 mm segment of each organ. The variances of the deviation from vertical in each treatment population, as an indicator of the degree of disruption of gravitropic mechanisms, were compared. Rice seedlings did not develop roots under anoxia. Coleoptiles grown in nitrogen elongated slightly more than those in air, but did not fully exhibit strict negative gravitropism. When treated with NPA, both coleoptiles and roots of air-grown seedlings showed diminished gravitropic responses. After seedlings were re-oriented through 90° after 18 h, neither roots nor coleoptiles were able to reattain vertical growth during a further 18 h period, and they exhibited enhanced variance in the direction of elongation. When coleoptiles of anoxically-grown seedlings were similarly reoriented, they also demonstrated a diminished capacity to respond gravitropically. In the presence of NPA, anoxically-grown coleoptiles had severely disrupted responses, but negative gravitropism was not completely eliminated." @default.
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- W2069567189 date "1993-01-01" @default.
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- W2069567189 title "Gravitropism in rice seedlings: the effects of anoxia and N-l-naphthylphthalamic acid" @default.
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- W2069567189 doi "https://doi.org/10.1016/0168-9452(93)90077-d" @default.
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