THE ARCHITECTURAL ANALYSIS OF A FRUITING BRANCH IN TWO HAZELNUT CULTIVARS
We investigated the two hazelnut cultivars Istrska dolgoplodna leska (ID) and Pauetet, which differed in their vigour and growth habits, in a tree architectural analysis in order to quantitatively explain genotypic differences in their shoot morphology, including shoot dimension and geometry. A fruiting branch consisting of the five-year-old bearer plus corresponding four-, three-, two-, and one-year-old shoots was used as a structural unit. In both cultivars the branching pattern was proleptic. The fruiting shoots were one year old. In ID, annual shoots often grow on older shoots (that are three, four, or five years old), while in Pauetet, the time succession of shoot development is much more uniform, i.e. young shoots are more frequently inserted onto bearing shoots that are one year older. Basitony is better expressed in ID. In this cultivar the branching density is significantly lower than in the cv. Pauetet. In ID, which exhibits the spreading growth habit, the angles of (one- and two-year-old) young shoots are significantly larger than in Pauetet, which has a semi-erect to erect growth habit. On the contrary, the older (three, four and five year old) wood, has wider angles in Pauetet than in ID. The two genotypes significantly differ in shoot diameter. Cv. ID has thicker shoots of all ages except for its five-year-old bearers. One-, two-, and three year-old shoots on two-, three-, and four year-old bearers are longer in ID, while the older shoots are longer in Pauetet. Cv. ID develops significantly more fruits per one-year-old flowering shoot than cv. Pauetet.
Solar, A. and Stampar, F. (2005). THE ARCHITECTURAL ANALYSIS OF A FRUITING BRANCH IN TWO HAZELNUT CULTIVARS. Acta Hortic. 686, 179-186
Corylus avellana L., tree architecture, shoots, bearing potential, genotypic variation