Modification of gibberellin biosynthesis in the grafted apple scion allows control of tree height independent of the rootstock

Bulley Sean M., Wilson Fiona M., Hedden Peter, Phillips Andrew L., SJ Croker, James David J.

Research output: Contribution to journalArticle (Academic Journal)

39 Citations (Scopus)

Abstract

The availability of short stature apple scions that required minimal applications of chemical growth retardants and could be used with a range of rootstocks would be of considerable benefit to fruit growers. We have suppressed the expression of a gene encoding the gibberellin (GA) biosynthetic enzyme GA 20-oxidase to reduce the levels of bioactive GAs in a scion variety, resulting in significant reductions in stem height. Application of GA3 reversed the effect. The scion remained dwarfed after grafting on to normally invigorating rootstocks, whilst control plants of the same cultivar displayed the expected vigour when grafted on to these rootstocks. This approach could be applicable to any perennial crop variety, allowing dwarf trees to be obtained on any available rootstock or on their own roots without the need for chemical growth retardant application. In effect, seedlings that are well suited to local conditions (drought, salinity) could be employed as tree rootstocks, as could existing rootstocks valued for characters other than vigour control, such as pest and disease resistance.
Translated title of the contributionModification of gibberellin biosynthesis in the grafted apple scion allows control of tree height independent of the rootstock
Original languageEnglish
Pages (from-to)215 - 223
Number of pages8
JournalPlant Biotechnology Journal
Volume3(2)
Publication statusPublished - Mar 2005

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    Sean M., B., Fiona M., W., Peter, H., Andrew L., P., Croker, SJ., & David J., J. (2005). Modification of gibberellin biosynthesis in the grafted apple scion allows control of tree height independent of the rootstock. Plant Biotechnology Journal, 3(2), 215 - 223.