Abstract
The viability of pollen of 5 collectible varieties of Russian plum of the Pushkinskiye and Pavlovskiye VIR Laboratories SPB before and after cryopreservation was studied. It was found that a significant factor for the level of pollen viability is “variety” (p=0.07), the factors “cryopreservation” (p=0.457), “year” (p=0.221), as well as the interaction of the factors “variety× cryopreservation” (p=0.172), were not significant at the p<0.05 level of significance. For long-term storage of Russian plum pollen in liquid nitrogen, the year of pollen collection is not a significant factor. For most genotypes, no negative impact of cryoсonservation on pollen viability was revealed. The varieties ‘Aureus’, 'Podarok Sankt-Peterburgu’ and ‘Exotica’ after cryopreservation for 1 year showed a tendency to increase the pollen viability indicators.
Highlights
Diploid plum species, 2n=16, which include a new cultigenic species - the Russian plum (Prunus rossica Erem.), have a complex of valuable biological traits: immunity, early fruitfulness, yield, frost resistance, early ripening, decorative effect. [1, 2]
In Latvia, the Chinese plum variety ‘Skoroplodnaya’ had pollen viability ranging from 0.2 to 25.6% depending on the year of research. [6]
In the conditions of the North-Western region in the collection garden of the scientific and production base Pushkinskiye and Pavlovskiye VIR Laboratories (Saint Petersburg, Pavlovsk), in 2017-2019, a study of the pollen viability of 5 new varieties of Russian plum originating from two geographical regions of the Russian Federation was conducted (Table 1)
Summary
2n=16, which include a new cultigenic species - the Russian plum (Prunus rossica Erem.), have a complex of valuable biological traits: immunity, early fruitfulness, yield, frost resistance, early ripening, decorative effect. [1, 2]. There are significant differences in the level of pollen viability in varieties of Russian plum, in different genotypes of the species, this level was in the range of 1.6-39.0%. The high pollen viability on artificial growing medium was observed in the varieties of Russian plum in Belarus - from 47.0 to 77.0%, in this region, genotypes with low pollen viability were identified, from 1.0 to. In Latvia, the Chinese plum variety ‘Skoroplodnaya’ (one of the parent forms of many Russian plum varieties) had pollen viability ranging from 0.2 to 25.6% depending on the year of research. In Latvia, the Chinese plum variety ‘Skoroplodnaya’ (one of the parent forms of many Russian plum varieties) had pollen viability ranging from 0.2 to 25.6% depending on the year of research. [6]
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