Olavi Luukkanen. (1981). Effects of gibberellins GA4 and GA7 on flowering in Scots pine grafts. Silva Fennica vol. 15 no. 4 article id 5129. https://doi.org/10.14214/sf.a15186

Keywords: Pinus sylvestris; Scots pine; flowering; growth hormones; gibberellic acid; male flowering; female flowering

Abstract | View details | Full text in PDF | Author Info

Ethanolic sprays of GA₄ or GA₇ on 9-year old Scots pine (Pinus sylvestris L.) grafts, repeated four times during the shoot elongation period, resulted in a statistically significant increase in female flowering one year after the treatment. Of the two compounds, GA₄ seemed to be somewhat more efficient, yielding 47 female strobili/100 shoots vs. 36 and 6 strobili/100 shoots in GA₇ and control treatments respectively. The mixture of GA₄ and GA₇ compounds was also applied and seemed to have an effect intermediary to those of the pure compounds. However, due to the limited amounts of material, none of the differences between the gibberellins could be statistically confirmed. Male flowering frequencies were also too low to allow any firm conclusions, but the numerical results suggested that the purified gibberellins may promote male and female flowering in different ways.

The PDF includes a summary in Finnish.

Luukkanen, E-mail: ol@mm.unknown

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