模拟微重力对植物幼苗光合特性的影响(英文)

Effects of Simulated Microgravity on Characteristics of Photosynthesis in Plant Seedling

目的研究模拟微重力对植物幼苗光合特性的影响。方法采用 1π回转器模拟微重力并处理植物样品 1 2 0h。结果 1 )株高和叶片数有所增加 ;2 )草莓的叶绿素含量降低 47.5 % ,香石竹叶绿素含量增加4.3% ;3)回转后两种幼苗的叶绿素主要吸收峰位不变 ,而每个峰位吸收强度有所增加 ;4)两种幼苗的叶片快速荧光动力学参数 ,回转后除CA/Fo外 ,Fv/Fo ,Fv/Fm和T1 / 2 均有提高 ;5 )对照和处理的叶绿体的两个光系统间的激发能分配有差异。结论微重力对叶绿体的正常光合功能没有显著影响 ,故植物幼苗在微重力条件下可以正常生长。

Objective To study the effects of simulated microgravity on the characteristics of photosynthesis in some plant seedlings. Method Plant samples were treated on a 1 π clinostat rotated at 2 γ/min for 120 h.Then chlorophyll absorption and chlorophyll fast fluorescence induction kinetics were determined. Result After treatment on the clinostat:1)there were some increase in height and number of leaves per plant;2)the strawberry seedlings contained 47.5% less chlorophyll and the carnation seedlings contained 4.3% more;3)there was no change in position of the main absorption peaks of chlorophyll in both seedlings after the rotation, but their intensity was increased;4)there were significant increase in the parameters of fluorescence induction kinetics in the leaves of both seedlings: there was an increase in Fv/Fo, Fv/Fm and T 1/2 , except CA/Fo;5) there were some differences in excitation energy distribution between the two photosystems in the chloroplasts of control and treated samples. Conclusion Simulated microgravity does not have a significant effect on normal photosynthetic function in chloroplasts, so plant seedlings can grow up normally under microgravity.