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Title of Journal: Trees

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Springer-Verlag

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1432-2285

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Branching of annual shoots in common walnut Emph

Authors: Anita Solar Gregor Osterc Franci Štampar Damijan Kelc
Publish Date: 2011/06/16
Volume: 25, Issue: 6, Pages: 1083-1090
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Abstract

Relationship of bud production axillary and terminally of annual shoot 1Y and/or the content of budderived indol3acetic acid IAA to branching of the 1Y was studied in common walnut Juglans regia L cvs Franquette and Lara Cultivarrelated branch architecture was determined Lara tended to branch more densely than Franquette 53 vs 42 Significantly more fruiting offspring shoots FO than vegetative ones VO grewout per 1Y in both cultivars whereas the ratio FO/VO of Lara exceeded that of Franquette by four times An acrotonic branching pattern was more strongly expressed in Lara compared to Franquette Budderived IAA was influenced by the cultivar Franquette had 36 times more cumulative IAA along the 1Y than Lara and by the relative position terminal subterminal medial and basal of the buds along 1Y An opposite relationship between branching density and cumulative IAA content was established in both cultivars At the 1Y relative position level the opposite ratio between branching density and IAA content was clearly shown only on the basal position of the bud along 1Y in the Lara cultivar Such an inconsistent linkage between bud production and the IAA spatial distribution along the 1Y illustrated that hormonal factors probably weakly affect the branching of Franquette and Lara The length of the parent 1Y the position of the buds along the 1Ylength and the fate of the buds seemed to have a stronger influence on the bud outgrowth and further development of the offsprings In further analyses seasonal fluctuations of the IAA and the following activity of the buds should be investigated in order to improve the understanding of a complex branching phenomenon in walnutThis work was supported by the Slovenian Ministry of Higher Education Science and Technology and is a part of the programme Horticulture No P400130481 The authors thank Dr Evelyne Costes for her valuable comments and two anonymous reviewers for the greatly appreciated suggestions on the manuscript

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