Effect of Fusicoccin on Adventitious Root Formation of Birch Shoot Tips (Betula pendula ROTH) Cultured in vitro |
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Authors: | Dembny H; Zoglauer K; Muromtsev G S; G?oring H |
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Institution: | 1Humboldt University, Department of Biology, Division of Plant Physiology, Invatidenstr 42, Berlin 1040, G.D.R.
2Institute of Molecular Biology and Genetics of the Academy or Agricultural Sciences Moscow, U.S.S.R. |
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Abstract: | The effect of fusicoccin (FC) on adventitious root formationwas investigated using in vitro shoot tip cultures of birch(Betula pendula ROTH) as test system. Treatment with 107105M FC hastened root appearance as well as 5 ? 106 M IAAdid. Optimal FC concentrations also promoted rooting by increasingthe root number per cutting. FC application during the first48 hours of culture was enough to obtain these effects. Usinginternode segments without any bud it was shown that FC couldnot replace the root inducing activity of endogenous auxin asapplied IAA did, but FC lowered the threshold concentrationof IAA for rooting response and stimulated adventitious rootformation if it was applied with IAA simultanously. Root growthwas enhanced in the early phase but inhibited later by continuoustreatment with FC. Some aspects of possible FC IAA interactionsare discussed. (Received September 4, 1986; Accepted November 24, 1987) |
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