Letter | Published:

Effects of Gibberellic Acid and Allogibberic Acid on Flowering and Internode-Length in Pisum sativum

Naturevolume 191pages514515 (1961) | Download Citation



SEVERAL workers1,2 have shown that gibberellic acid causes an increase in internode-length in peas, especially in the dwarf (le) varieties where the increase may be as great as 500 per cent. In addition we have shown that gibberellic acid delays flowering by 1–2 nodes in tall (Le) or dwarf (le) and late (Sn) or early (sn) varieties2. Segregation of alleles at the Le and Sn loci has a number of overlapping effects3. It thus appears that genes at both loci may be working by way of some aspect of gibberellin metabolism. Accordingly we have tested the effect on flowering and stem-length of peas of a number of compounds related in structure to gibberellic acid. We are indebted to Dr. P. W. Brian (Imperial Chemical Industries, Ltd.) for the gift of the compounds used.

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  1. 1

    Brian, P. W., and Hemming, H. G., Physiol. Plant., 8, 669 (1955).

  2. 2

    Barber, H. N., Jackson, W. D., Murfet, I. C., and Sprent, J. I., Nature, 182, 1321 (1958).

  3. 3

    Barber, H. N., Heredity, 13, 33 (1959).

  4. 4

    Cross, B. E., J. Chem. Soc., 4670 (1954).

  5. 5

    Brian, P. W., Grove, J. F., Hemming, H. G., Mulholland, T. P. C., and Radley, M., Plant Physiol., 33, 329 (1958).

  6. 6

    Cross, B. E., Grove, J. F., MacMillan, J., Mulholland, T. P. C., and Sheppard, N., Proc. Chem. Soc., 221 (1958).

  7. 7

    Cross, B. E., Grove, J. F., MacMillan, J., and Mulholland, T. P. C., Chem. and Indust., 954 (1956).

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  1. Botany Department, University of Tasmania, Hobart

    • I. C. MURFET
    •  & H. N. BARBER


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