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Effects of gibberellic acid and chlormequat chloride on the proportion of phloem and xylem parenchyma in the storage root of carrot (Daucus carota L.)

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Abstract

A foliar application of gibberellic acid (GA) (100 mg/l) 5 weeks after emergence increased the shoot/storage root ratios, measured 4 weeks later, of 9 cultivars representing a range of types of carrot. Chlormequat chloride (CCC) (2000 mg/l) decreased the ratio for seven of the cultivars. Assessment 8 weeks after treatment showed fewer significant effects of both growth regulators.

At the first harvest, GA decreased the phloem/xylem ratio and significantly reduced the amount of secondary phloem produced in the storage root of all cultivars. CCC had no comparable effect except for an increase in the phloem/xylem ratio for one cultivar at both harvests. The significance of these results is discussed in relation to secondary vascular tissue production in storage roots as affected by assimilate partitioning in the whole plant.

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Authors and Affiliations

  1. National Vegetable Research Station, Wellesbourne, Warwick, U.K.

    J. M. T. McKee & G. E. L. Morris

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  1. J. M. T. McKee
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  2. G. E. L. Morris
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McKee, J.M.T., Morris, G.E.L. Effects of gibberellic acid and chlormequat chloride on the proportion of phloem and xylem parenchyma in the storage root of carrot (Daucus carota L.). Plant Growth Regul 4, 203–211 (1986). https://doi.org/10.1007/BF00028163

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  • DOI: https://doi.org/10.1007/BF00028163

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