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Growth of rose flower peduncles and effects of applied plant growth regulators

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Abstract

Removal of flower buds results in abscission of peduncles of the rose cv. Nubia and cessation of peduncle growth in cv. Mercedes. Peduncle growth was inhibited when pistils and stamens were removed, but was not affected by removal only of sepals and petals. Growth of the decapitated peduncles of ‘Mercedes’ was partially restored by the application of auxin in lanolin paste on the base of the peduncle and was completely restored by the application of gibberellin, while the combined application of auxin and gibberellin was the most effective for growth restoration. Growth of non-decapitated ‘Nubia’ peduncles was promoted by application of gibberellin or gibberellin and auxin but not auxin alone.

Peduncle elongation of both cultivars was not affected by application of cytokinin and the effect of gibberellin was antagonized by combined application with cytokinin. The peduncles strength (resistance to bending) was affected more strongly by auxin than by gibberellin, and most strongly when auxin and gibberellin were combined. The effect of auxin on the strength of peduncles, but not of gibberellin, was antagonized by application of cytokinin. Excised, non-decapitated flowering stems of ‘Nubia’ treated with gibberellin and auxin in situ, showed, recovery of the peduncles from wilting after exposure to heat conditions.

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Authors and Affiliations

  1. Faculty of Agriculture, The Hebrew University of Jerusalem, P.O. Box 12, 76100, Rehovot, Israel

    N. Zieslin, F. Starkman & E. Zamski

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  1. N. Zieslin
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  2. F. Starkman
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  3. E. Zamski
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Zieslin, N., Starkman, F. & Zamski, E. Growth of rose flower peduncles and effects of applied plant growth regulators. Plant Growth Regul 8, 65–76 (1989). https://doi.org/10.1007/BF00040917

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  • DOI: https://doi.org/10.1007/BF00040917

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