Comparison of Endogenous Gibberellins and of the Fate of Applied Radioactive Gibberellin A1 in a Normal and a Dwarf Strain of Japanese Morning Glory 1

AUTOR(ES)

Barendse, Gerard W. M.

RESUMO

The effect of application of GA3 on hypocotyl growth, the endogenous GAs, and the metabolism of applied 3H-GA1 were investigated in relation to dwarfism and light-mediated growth inhibition in the normal (tall) strain Violet and the dwarf strain Kidachi of Japanese morning glory (Pharbitis nil). GA3 applied in a wide concentration range (10−9 to 10−3m) to 4-day-old seedlings caused great extension of the hypocotyls in light-grown plants of both the normal and the dwarf strain. However, the dwarf strain did not attain the same length as the normal one at any given GA3 concentration, even when saturation was reached. Dark-grown plants of the dwarf strain responded to GA3, although relatively much less than light-grown ones; dark-grown plants of the normal strain showed no GA3 response at all.

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