Response of Seedlings of a Dwarf and a Normal Strain of Watermelon to Gibberellins 1

AUTOR(ES)

Loy, J. Brent

RESUMO

Hypocotyl and root elongation in a dwarf and a normal strain of watermelon (Citrullus lanatus [Thunb.] Matsu.) in the absence or presence of different gibberellins was investigated in seedlings grown under gold fluorescent light or in darkness. The normal strain, “Sugar Baby,” responded only slightly to the gibberellic acids employed. At appropriate concentrations all of the gibberellic acids were capable of normalizing growth in the monorecessive dwarf strain, WB-2, in darkness or in light. Gibberellins A4+7 and A7 were effective in stimulating hypocotyl elongation at concentrations 10 to 15 times lower than that needed for a response to GA1 or GA3. Dark-grown dwarfs responded to about a 3-fold lower concentration of GA4+7 than those grown in light.

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