关键词: UV-B辐射, 施硅, 水稻, 光合作用, 蒸腾作用

Abstract: To clarify the effects of 2-year-old female cone’s development on vegetative growth and biomass accumulation of shoots and leaves in Pinus koraiensis, the differences of shoot growth and biomass accumulation in the current year were analyzed with reproductive branches and vegetative branches. The results showed that the 2-year-old female cones inhibited the development of 1-yearold female cones. The vegetative growth of the reproductive branches in the current year was more vigorous than that of the vegetative branches. The vegetative growth of the reproductive branches (excluding the terminal buds) in the current year was positively correlated with the length and basal diameter of the parent shoots (P<0.05). The biomass of the terminal and lateral shoots of the reproductive branches in the current year was positively related with the biomass of the parent shoots (P<0.05). The number of 2-year-old female cones was significantly positively correlated with the basal diameter of terminal shoot, length of lateral shoot, diameter of lateral shoot, number of lateral shoot buds, and number of lateral shoot of the reproductive branches in the current year (P<0.05). The biomass of 2-year-old female cones was significantly positively correlated with the biomass of terminal shoots, the biomass of lateral shoots, and the biomass of total shoots in the current year (P<0.05). These results indicated that the development of 2-year-old female cones could promote vegetative growth and biomass accumulation in the current year’s growth of the reproductive branches. The terminal shoots and needles, the lateral shoots and needles of the reproductive branches were allocated more biomass in the current year than the vegetative branch. More than 87% of the biomass in the reproductive branches was allocated to 2-year-old female cones, while only 0.22% was allocated to 1-year-old female cones. The development of 2-year-old female cones directly affected the biomass accumulation of the parent shoots of the reproductive branches, while the biomass of the parent shoots of the reproductive branches directly affected the biomass accumulation of the reproductive branches and vegetative branches in the current year.

Key words: UV-B radiation, silicon supply, rice, photosynthesis, transpiration.