Relationship between reproductive behavior and new shoot development in 5-year-old branches of olive trees (Olea europaea L.) |
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Authors: | Franco Castillo-Llanque Hava F Rapoport |
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Institution: | (1) IFAPA, Centro “Alameda del Obispo”, Avda. Men?ndez Pidal s/n, 14004 C?rdoba, Spain;(2) Instituto de Agricultura Sostenible (IAS-CSIC), P.O. Box 4084, 14080 C?rdoba, Spain; |
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Abstract: | The development of new shoots plays a central role in the complex interactions determining vegetative and reproductive growth
in woody plants. To explore this role we evaluated the new shoots in the olive tree, Olea europaea L., and the effect of fruiting on new shoot growth and subsequent flowering. Five-year-old branches served as canopy subunits
in order to obtain a global, whole-tree view of new shoot number, size and morphological origin. The non-bearing trees had
many more shoots than the fruit-bearing trees, and a greater number of longer shoots. In both bearing conditions, however,
the majority of shoots were less than 4 cm long, with shoots of progressively longer lengths present in successively decreasing
frequencies. Six major shoot types were defined on the basis of apical or lateral bud origin and of parent shoot age. On fruit-bearing
trees, the new shoots originated predominantly from the shoot apex, while on non-fruiting trees, they formed mainly from axillary
buds, but in both cases, they tended to develop on younger parent shoots. The previous bearing condition of the tree was the
main determinant for subsequent inflorescence development, which was independent of both shoot type and length. Thus, reproductive
behavior strongly affected both the amount and type of new branching, but subsequent flowering level was more influenced by
previous bearing than by the potential flowering sites on new shoots. |
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