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Response of Eucalyptus nitens seedlings to gibberellin biosynthesis inhibitors


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Williams, DR, Ross, JJ, Reid, JB and Potts, BM 1999 , 'Response of Eucalyptus nitens seedlings to gibberellin biosynthesis inhibitors' , Plant Growth Regulation, vol. 27, no. 2 , pp. 125-129 , doi: 10.1023/A:1006176928861.

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The plant growth regulators (PGRs) paclobutrazol, chlormequat chloride and prohexadione where applied to 11
month old seedling of Eucalyptus nitens to examine their relative effects on precocious flowering, growth and
levels of GA20 and GA1 in the shoot apex. Paclobutrazol was most effective in reducing growth and levels of GA20
and GA1 in the seedlings followed by chlormequat chloride with prohexadione being least effective. Paclobutrazol
and chlormequat chloride reduced both GA20 and GA1 levels by similar degrees, but prohexadione reduced GA1
levels considerably more than GA20 levels. None of these PGRs was effective in promoting precocious flowering.
This suggests that there is an extra level of reproductive control operating in juveniles of this species compared
to those of the closely related species E. globulus previously found to flower precociously in response to similar
paclobutrazol treatments.

Item Type: Article
Authors/Creators:Williams, DR and Ross, JJ and Reid, JB and Potts, BM
Keywords: chlormequat chloride, Eucalyptus, gibberellin, paclobutrazol, precocious flowering, prohexadione
Journal or Publication Title: Plant Growth Regulation
ISSN: 0167-6903
DOI / ID Number: 10.1023/A:1006176928861
Additional Information:

BM Potts. The original publication is available at

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