engleski

Morphological characteristics of the needles of European black pine (P. nigra Arn.), Scots pine (P. sylvestris L.), Japanese red pine (P. densiflora Sieb. et Zucc.) and their interspecific hybrids

Three morphological characteristics of the needles of P. nigra Arn. (ni), P. sylvestris (sy), P. densiflora Sieb. et Zucc. (de) and their F1 hybrids (nisy) and F2 hybrids (F2 nisy) were analysed: 1. needle length (L), 2. number of serrations on needle margins (Nz) and 3. number of stomatal rows on the above side of the needle (Np). Discriminant analysis pointed to the possibility of discriminating between the species and their hybrids, as well as subsequent clasification of new cases, on the basis of the tree needle characteristics studied. Three separate analyses were created: 1. ni, sy, nisy and F2 nisy ; 2. ni, de, nide and deni ; 3. de, sy and desy. Best possible discrimination was that between European black pine and F2 hybrids nisy, with the strongest influence of variable L (needle length). The possibility of mistaking European black pine needles for F2 hybrid needles is 4%, while there is practicaly no wrong classification of F2 hybrid needles as European black pine needles. The most reliable classification is that of F2 hybrids (88%). In the second analysis the best possible discrimination was that of Japanese red pine and the other groups taken together, with the strongest influence of variable Nz (number of serrations). Based on the tree characteristics studied, 81% of Japanese red pine needles can be correctly classified. In the third analysis, the best discrimination was that between Scots pine and Japanese red pine, the reliability for these two species amounting to 98%. Their F1 hybrids are intermediary and cannot be discriminated from the parent species only on the basis of the tree needle characterictics studied.

Pinus nigra Arn.; P. sylvestris L.; P. densiflora Sieb. et Zucc.; interspecific hybrids; needle morphology; discriminant analysis

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