Study of remontant raspberry pollen viability in the conditions of the Southern Baikal region

It is known that the viability of pollen depends not only on weather conditions and agricultural technology, but also on the genotype of the plant. The study examined the relationship between the viability of pollen collected at different times and the variety of remontant raspberry. The results of phenological observations of raspberry varieties and forms during the period from the beginning of vegetation to flowering are presented, and the duration of this period in the conditions of the Southern Baikal region is also considered. The need to accumulate sums of active temperatures for the passage of phenological phases in the conditions of the region under study was taken into account. As a result, three groups of varieties were identified: early, mid-season and late flowering. The viability of pollen of different varieties and forms was determined, and genotypes characterized by consistently good pollen viability (more than 50%) were identified. The period in which the viability of pollen of almost all genotypes was assessed as good was determined. The exceptions were two forms, for which viability was less than 50% during the study period. Statistical analysis showed that air humidity (57%) has the least influence on pollen viability, while air temperature has the greatest influence (more than 90%). It is noted that a decrease in night temperatures to negative critically affects the viability of pollen. Since the viability of pollen in different genotypes was not the same, it is important to select parent plants for pollination based on this feature. Research can help in breeding remontant raspberries. It is possible to increase the efficiency of pollination and increase the yield of hybrid seeds taking this feature into account when selecting parent plants.

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