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存放了一段时间的南瓜,打开后有的会出现子发芽的现象,芽能长到二三寸长,还带着小叶片.这是为什么呢?众所周知,种子萌发需要一定的温度、空气和水分.当具备了这些条件,在 10～12℃的温度下,只要瓜内再有一定量的空气,子就可以萌发,一级南瓜种子的发芽率是95%左右,二级种子的发芽率为 75%左右,只需6—8天的时间就能发芽.那么,瓜内的空气又是如何进去的呢?这是由几种因素促成的.一是南瓜通过表皮细胞的呼吸可以透入气体.二是瓜摘下后,空气从
Pumpkin stored for a period of time, after opening there will be the phenomenon of germination, the bud can grow to two or three inches long, but also with small leaves.This is why? As we all know, the seed germination requires a certain temperature, air and water When these conditions are met, as long as there is a certain amount of air in the melon at the temperature of 10-12 ° C, the seeds can germinate, the germination percentage of the first-grade pumpkin seeds is about 95% and the germination percentage of the second-grade seeds is 75% About 6-8 days will be able to germinate.Then, the air inside the melon is how to go in? This is contributed by several factors.First, the pumpkin through the epidermal cells can breathe gas.Second After the melon is taken off, the air comes from