Germination of Cotoneaster multiflorus Bunge., under different dormancy breaking treatments

Abstract

Cotoneaster multiflorus is a large deciduous, ornamental shrub, suitable for landscape use. It has long arching branches and very abundant white flowers followed by scarlet-red fruit. It is low-demanding species which can grow on clay soils. As a drought tolerant species, it has potential to withstand the effect of climate change. Generative propagation of this species is difficult due to its combined embryo and seed coat dormancy. For that reason, the aim of this study was to establish quick and effective method for generative propagation of selected elite genotypes of C. multiflorus that are growing in the Belgrade area. The seeds were collected in a public green spaces in the park in Petlovo brdo, Belgrade, and after maceration, the effect of different treatments was examined. These treatments included soaking seeds in sulfuric acid at 96 % for 60 or 90 minutes, 5 months of cold stratification at 3-5oS in perlite or without substrate (naked stratification), and combinations of these treat?ments. The obtained results showed that C. multiflorus requires the combination of sulfuric acid pre?treatment and a cold stratification in perlite for germination. The seeds treated with sulfuric acid followed by 5 months of naked stratification didn?t germinate. The length of sulfuric acid treatment also influenced germination rate and better results were achieved with seeds that were soaked for 90 minutes in sulfuric acid compred to 60 minutes treatment. However, the maximum germination percentage obtained in this research did not exceed 40%, real ger?mination rate was 59%. It is necessary to perform additional research in order to improve germination.