作　　者： ; ; ;

机构地区： 金陵科技学院园艺学院

出　　处： 《园艺学报》 2007年第4期979-984,共6页

摘　　要： 以7叶龄幼苗为试材,研究了可溶性硅(Si)对盐(NaCl)胁迫下库拉索芦荟(Aloevera L.)叶绿素荧光参数和叶绿体超微结构的影响。结果表明,随处理时间延长,芦荟对NaCl(100mmol/L)胁迫的响应愈加明显,胁迫30d的伤害明显重于10d,但NaCl胁迫下加Si(2.0mmol/L)与不加Si相比,叶绿素(Chl.)总含量下降幅度小,Chl.a含量显著提高,叶绿素初始荧光(Fo)值的上升与可变荧光(Fv)值的下降受到抑制,光系统Ⅱ(PSⅡ)潜在活性(Fv/Fo)显著增强,同时,加Si有利于保持盐胁迫下芦荟叶绿体的形态,保护类囊体的超微结构,说明施Si缓解盐胁迫对光合细胞器的伤害,可改善盐胁迫下芦荟的光合作用。 Effects of soluble silicon （Si） on parameters of chlorophyll fluorescence and ultrastructure of chloroplast in Aloe vera L. under salt stress were investigated with seven-leaf-old seedlings. Experimental results showed that the responses of aloe to NaCl （ 100 mmol/L） stress were more evident with prolongation of treatment time; salt injury of 30 d after treatment was more serious than that of 10 d. However, compared with the plants treated with NaCl alone, under NaCl stress with added Si （2.0 mmol/L） , the decrease of total chlorophyll content slightly decreased, chlorophyll a content significantly increased, the increase of minimal fluorescence （Fo） and the decrease of variable fluorescence （Fv） were inhibited, and the potential activity of photosystem Ⅱ（ PS Ⅱ ） , i. e. Fv/Fo ratio was significantly enhanced. Meanwhile, added Si was favourable to maintain the morphology and structure of aloe chloroplast and to protect the integrity of thylakoid structure, illustrating that exogenous soluble Si alleviates injury of salt stress to photosynthetic organelle and improves photosynthetic efficiency of salt-stressed aloe plant.

关 键 词： 芦荟 叶绿素荧光 叶绿体超微结构 盐胁迫 硅

领　　域： [生物学] [农业科学] [农业科学]