东北红豆杉开花结实的规律

东北红豆杉雌雄异株，雌、雄花芽多着生于树冠外部1年生枝条叶腋处，在一定范围内较高的温，湿度有利于花芽的分化，在花粉形成过程中，尤其是减数分裂期遇到低温或持续低温，会导致大量花粉败育；而低温可以延长成熟后的风干花粉寿命，东北红豆杉结实量少，但不同年份间结实量的重复力却较高，单株间结实量重复力较小，说明年份间结实较稳定，而个体间结实量变异较大。

The Setting Law of Taxus cuspidata

Taxus cuspidata is heterothallism. Most of flower buds are in folio pocket of I year old branches of outside crown. High-temperature and high-humidity are beneficial to flower bud differentiation. More pollens will be become abortive pollens if it is low-temperature or sustained low temperature during pollen forming especial meiosis stage. And lower temperature could prolong pollens life. There are higher repetition of seed setting among different years and lower repetition among different plants. That mean there is more stable fructification among years and bigger difference among plants.