Evaluation of Red Raspberry Cultivars Used for Breeding and Commercial Growing in the Baltic Region

Abstract

The structure of raspberry cultivars and genetic resources in the Baltic countries have been influenced by the historical political situation in the 20th century and climatic conditions, especially winterhardiness. The genetic resources consist of some old European and American cultivars, but mostly of cultivars and hybrids bred in Russia. Currently, targeted breeding programmes are active only in Estonia and Latvia, which aim to develop winterhardy, disease-resistant cultivars, well adapted to the local climate. Therefore, parent material for hybridisation has been chosen from local advanced hybrids and introduced cultivars suitable to the regional climatic conditions. The aim of the study was to estimate the level of genetic diversity of Rubus germplasm and assess inter-specific and intra-specific relationships using phenotypical characterisation and molecular markers. Forty one Rubus genotypes were evaluated by 41 phenotypical traits and 15 previously described SSR markers. Both characterisation approaches discovered high correspondence with pedigree and a low level of diversity. A limited amount of the diversity of raspberry genetic material has been used in various breeding programmes, despite their broad geographical origin. The obtained results indicate the need for including local wild R. idaeus plant material into breeding programmes.

Comparison of the Micromorphology and Ultrastructure of Pollen Grains of Selected Rubus idaeus L. Cultivars Grown in Commercial Plantation

“…Rubus shrubs grow in forests and their margins and in roadside thickets [ 12 , 13 ]. The species has many cultivars used for home-garden cultivation and commercial production [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ].…”

Molecular markers in the genetic diversity studies of representatives of the genus <i>Rubus</i> L. and prospects of their application in breeding

“…Созданные наборы SSR-маркеров широко использовались для изучения генетического разнообразия и генотипирования селекционных сортов ежевики и малины (Castillo et al, 2010a;Лебедев и др., 2018), малины обыкновенной (Badjakov et al, 2009;Lamoureux et al, 2011;Girichev et al, 2015;Lacis et al, 2017) и малины западной (Dossett et al, 2012а, b).…”

“…С помощью SSR-маркеров проведено генотипирование российских сортов малины обыкновенной и сортов селекции сопредельных стран (Lamoureux et al, 2011;Lacis et al, 2017), а также европейских сортов (Girichev et al, 2015). В этих исследованиях не было получено четкой кластеризации сортов, созданных в селекционных программах разных стран, и сортов, имеющих различное генетическое происхождение.…”

Nectar Secretion, Morphology, Anatomy and Ultrastructure of Floral Nectary in Selected Rubus idaeus L. Varieties

“…Rubus idaeus belongs to the subgenus Ideobatus [13]. In Poland, this species occurs in its natural state but there are also numerous varieties grown in amateur and commercial cultivation [14][15][16].…”