1. Bartel B 1997 Auxin biosynthesis. Annu. Rev. Plant Physiol. Plant Mol. Biol. 48, 51–66.
2. Brian P W, Hemming H G and Lowe D 1960 Inhibition of rooting of cuttings by gibberellic acid. Ann. Bot. 24, 407–419.
3. Criley R A and Parvin P E 1979 Promotive effects of auxins, ethephon and daminozide on the rooting of Protea melifolia cuttings. J. Am. Soc. Hort. Sci. 104, 592–596.
4. Davis T D, Sankla N, Walsee R and Upadhyaya A 1985 Promotion of adventitious root formation on cuttings by paclobtrazol. Hort. Sci. 20, 883–884.
5. Fawcett C H, Wain R L and Wightman F 1960 The metabolism of 3-indolylalkanecarboxic acids, and their amides, nitriles and methyl esters in plant tissues. Proc. R. Soc. Lond. Ser. B 152, 231–254.