engleski

Ploidy of some arborescent willow clones in relation to their production in field tests

Cytological investigations were conducted of the following willows: Salix sitchensis Bong., a complex hybrid between S. alba L. x S. fragilis L. x S. caprea L. (S. x savensis Trinajstić et Krstiniać, a hybrid clone of S. alba x S. sitchensis, and the white Salix alba L. The cytological analysis confirmed the diploid nature of S. sitchensis, the triploid nature of S. alba x S. sitchensis clone V164, and the tetraploid nature of S. alba. It was not possible to obtain a chromsome count for S. x savensis, as dividing cells were not observed. In nursery conditions, hybrid triploid and putative triploid clones expressed vigorous juvenile growth, making them suitable for biomass production in short rotations (2 - 6 years) at dense spacings. Field tests of hybrid and tetraploid clones on various hydromorphic soil types along the Drava and the Sava rivers, revealed that a S. alba x S. sitchensis triploid clone V 164 exhibited slower diameter growth rate then tetraploid S. alba clones. For intensive plantations in long rotations, planting of hybrid, triploid clones was not recommended due to slower volume production.

Salix, chromosome, diploid, triploid, tetraploid, ploidy, biomass

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