Vol. 77 No: 1

Title:
Parthenocarpic fruit development in cloudberry (Rubus chamaemorus L.) is induced by 3β-hydroxylated gibberellins

Authors:
O. JUNTFILA, I. MARTINUSSEN, A. ERNSTSEN, G. NILSEN and T.V. BHUVANESWARI

pp: 9-12

Abstract:
The purpose of this study was to test the activity of gibberellins and auxins fqr induction of parthenocarpic fruit development in cloudberry, Rubus chamaemorus L., a dioecious, northern wild berry with potential for cultivation. Plant hormones were applied directly to open flowers, either dissolved in ethanol or as an aqueous spray. Of the tested gibberellins (GA₁, GA₃, GA₄, dimethyl-GA₄, GA₅, GA₉, GA₁₉, GA₂₀ and GA₂₄) only GA₁, GA₃, GA₄ and dimethyl-GA4 were active and induced fruit development comparable to development of polimated fruits. Lack of activity of GA20 and GA9, the immediate precursors of GA₁ and GA₄, respectively, suggests that 3β-hydroxylation of gibbereflins can be inhibited in unpollinated flowers of cloudberry. Auxin treatments induced an initial fruit development, but did not result in ripe berries. Based on these results, use of transgenic methods to regulate gibberellin or/and auxin biosynthesis m carpels of cloudberry could be used to develop a parthenocarpic cloudberry.

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