三是根尖能谱测定:植物根尖往往是对重力变化反应敏感的部位。朱治平等发现水稻种子空间飞行后,其根尖Ca~(2+)含量明显降低,推测与失重有关。氮、磷、钾等元素的含量也发生了变化。 四是光合特性的变化:飞行后,豌豆叶片中类囊体膜LHCⅡ寡聚体含量降低,单体含量增加。黄瓜种子经空间飞行后,其后代植株叶片中叶绿素含量增高,但叶绿素a/b比值以及Hill反应活性明显低于地面对照,说明空间条件可使叶绿体的光合作用光系统Ⅱ活性下降。拟南芥的聚光色素系统和作用中心色素以及能量在这两系统间传递效率也发生某种变化。 五是对碳水化合物代谢的影 Third, root tip spectrometry: plant root tips are often sensitive to changes in the site of gravity. Zhu Zhiping and others found that rice seed space flight, the root tip Ca ~ (2+) content was significantly reduced, presumably with weight loss. Nitrogen, phosphorus, potassium and other elements of the content has changed. Fourth, changes in photosynthetic characteristics: after flight, the thylakoid Membrane LHCII oligomer content in pea leaves decreased, the monomer content increased. The chlorophyll content of cucumber seeds increased after they were in space flight, but the chlorophyll a / b ratio and Hill reactivity were significantly lower than those of the ground control, which indicated that the photosynthesis photosystem Ⅱ activity of chloroplasts decreased under the conditions of space. Arabidopsis concentrator pigment system and the role of central pigment and energy transfer efficiency between the two systems also some changes. Five is the impact of carbohydrate metabolism