模拟失重下铁源对辣椒叶片结构及叶绿素荧光参数的影响  

Effects of Simulated Microgravity on Leaf Anatomical Structure and Chlorophyll Fluorescence Parameters of Capsicum annuum Growing under Different Iron Sources

作　　者：袁俊霞 陈瑜 李飞 李华盛 孙乔 鹿金颖 刘敏 Yuan Junxia;Chen Yu;Li Fei;Li Huasheng;Sun Qiao;Lu Jinying;Liu Min(Shenzhou Space Biotechnology Group,Beijing 100190,China)

机构地区：[1]航天神舟生物科技集团有限公司,北京100190 [2]北京市空间生物工程技术研究中心,北京100190

出　　处：《航天医学与医学工程》2018年第4期425-430,共6页Space Medicine & Medical Engineering

基　　金：国家国际科技合作专项项目(2015DFR30920)

摘　　要：目的探讨纳米铁粒子在模拟微重力环境下对植物组织结构、功能的影响。方法选取辣椒为研究对象,分别以Fe-EDTA和纳米铁作铁源,研究模拟微重力下铁源对辣椒生长、叶片结构、叶绿素含量及叶绿素荧光参数等的作用和影响。结果纳米铁作为铁源供给会增加植物的株高,引起辣椒叶肉细胞排列致密并增加叶肉细胞内叶绿体数目与片层结构。此外,模拟微重力环境下,不同铁源对叶绿素含量和叶绿素荧光参数(Fv/Fm、q P、ΦPSII)的影响不显著。结论在地面环境与模拟微重力环境下,纳米铁对辣椒的生长均具有促进作用,对植物叶片结构、叶绿素荧光参数的影响趋势也表现出相似变化特征,将纳米铁应用于空间植物栽培极具潜力。Objective To investigate the biological effects of iron nanoparticle（ Fe NPs） on plant growth under simulated microgravity（ SMG） conditions. Methods The crop plant Capsicum annuum was selected,and the effects of SMG on plant leaf anatomical features,chlorophyll contents and chlorophyll fluorescence kinetics parameters were comparatively studied under two different iron sources（ Fe-EDTA,Fe NPs）. Results Fe NPs could enhance the plant height. The anatomical features of the leaf showed more tightly packed mesophyll cells,more chloroplast numbers and more lamellae as compared with the Fe-EDTA treatment group. Under SMG,the chlorophyll contents and chlorophyll fluorescence kinetics parameters（ Fv/Fm、q P、ΦPSII） were measured,and there was no significant difference between the Fe-EDTA and Fe NPs treatment groups. Conclusion The promotion effect of Fe NPs on plant growth was observed both in ground control and in simulated microgravity groups. The effects of Fe NPs on leaf anatomical structure and chlorophyll fluorescence parameters also showed similar patterns in both groups indicating that Fe NPs could be an ideal supply for Fe2 ＋ions fertilizers in space plant growth.

关 键 词：纳米铁粒子 叶绿体 模拟微重力 辣椒 

分 类 号：Q693[生物学—生物物理学]