engleski

Multivariante analysis of leaf shape of the common oak (Quercus robur L.) in the "Gajno" provenance test (Croatia)

In this work, the results of morphological research of the common oak (Quercus robur) leaf shape in the provenance test in the locality of Gajno (Jastrebarsko, Croatia) are given. The provenance test was established in autumn 1987 with annual seedlings. The test included in total 16 provenances (15 from Croatia and one from Vojvodina region) belonging to various bioclimatic regions. The plot was arrenged in the form of a randomised block system with 100 plants per each repetition. The leaf sample for analysis was picked in July 1998, and 200 leaves of each provenance (50 per repetition) were analysed. On each leaf five traits (leaf blade length, leaf blade width, petiole length, number of lobes on the leaf blade left side and number of lobes on the leaf blade right side)were measured. Regularities in the variability of the particular traits under identical stand conditions corresponding to genetic differences were determined. All measured parameters were submitted to the description and regression analysis, the variance analysis and the multivariate analysis from which the differences between the studied provenances can be clearly seen. The results of this research will be very useful in the artificial regeneration of common oak forests, which is nowadays becoming more and more important and in which the selection of adequate regeneration material is of major importance, since the microsite conditions are fundamental to adequate decision making. Besides this, the quantity of acorns per area unit would be considerably reduced.

Quercus robur; leaf variability; provenance test

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