Microsporogenesis and Pollen Viability in Abies holophylla Maxim.

摘要

The first data have been presented concerning pollen development and viability in Abies holophylla Under climatic conditions of the Korea Forest Research Institute the process of microsporogenesis extends from the Mid-February till April 19. Frequenci es of meiotic irregularities averaged at 9.1% in two study trees as compared with 16.1% of abortive tetrads, 17.1% of abnormal pollen grains and 12.6% of disturbances during prothalial cell divisions. Cytologically, the most common types of meiotic irreg ularities were non-incorporated chromosomes into metaphase plates together with anaphase bridges and asynchronous movement of the chromosomes towards the poles of a microsporocyte. Pollen viability parameters in five study trees were mean of 63 39% of ge rmination capacity and 695.62 μm long pollen tubes. Climatically conditioned chromosome damages during prolonged prophase I are supposed to be the cause of a relatively low fertility of A. holophylla pollen.