Effects of greenhouse conditions on pollen viability of remontant raspberry

The article presents the results of the study of the genotype influence, as well as the cultivation conditions of remontant raspberries on the pollen viability. The studies were carried out in 2021–2023 at the collection site of the Bioresource Center of the Siberian Branch of the Russian Academy of Sciences (Irkutsk). The object of the study is raspberry varieties with a remontant type of fruiting, grown in open ground and greenhouses with film and polycarbonate covering. The quality of pollination directly correlates with the productivity of the crop. We investigated the relationship between the pollen viability collected at different times and under different cultivation conditions (open and closed ground) and the productivity of remontant raspberry plants. In open ground, high pollen viability was noted during the period of mass flowering (August 1) – 71.8 ± 7.86%, in a greenhouse with a polycarbonate covering from August 1 to September 1 – 74.5 ± 6.42 ... 75.9 ± 9.78%. Correlation analysis showed the influence of pollen viability on the fruit quality and plant productivity from 1 m2. The correlation coefficient in all variants tends to one and can be assessed as strong. According to the determination coefficient, the relationship between pollen viability and fruit weight is 98%, fruit size – 68%, productivity – 92%. The results can help in developing optimal conditions for cultivating crops in closed ground and selecting a flexible variety.