摘要
在全光照、30%、60%和80%遮光条件下,对引种植物大花百子莲叶片结构特征和光合特性进行了研究。结果表明:遮光处理后,大花百子莲叶面积随遮光率增加而逐渐增加,叶片厚度和比叶重则随遮光率增加而逐渐减小。气孔器长度随遮光率增加有逐渐变大的趋势,而气孔密度的变化趋势却相反。同时,4种光强条件下,叶绿素含量随着遮光程度的提高不断增加,叶绿素a/b值有小幅下降,说明大花百子莲叶片能够适应隐蔽环境并逐渐向阴性植物特征转变;大花百子莲光饱和点均低于1000μmol·m-·2s-1,光补偿点均低于20μmol·m-2·s-1,这一结果与耐荫性植物的一般指标一致,表明大花百子莲在有限的光照条件下能最大可能地利用低光量子密度进行光合作用。
Shading （0, 30%, 60% and 80%） was applied to Agapanthus praecox ssp. orientalis ‘Big Blue’ to determine a theoretical basis for morphological and photosynthetic characteristics in plantation and landscape application. These results showed that leaf area, length of stomata apparatus, chlorophyll contents increased under low light conditions, but thickness of leaf, leaf weight ratio, the ratio value of chlorophyll a/b and density of stomata apparatus decreased. All of those indicated that the leaves made a quick adjustment to shading environment and changed gradually to cheliophytes. The light saturation point （LSP） of A. praecox ssp. orientalis ＇Big Blue＇ was less to 1000μmol·m^-2·s^-1 and light compensation point （LCP） was less to 20μmol·m^-2·s^-1 which in keeping with indicators of shade enduring plants. The results showed that A. praecox ssp. orientalis ‘Big Blue＇ could make use of low photon density for photosynthesis under limited lighting conditions.
出处
《上海交通大学学报（农业科学版）》
2009年第3期242-247,共6页
Journal of Shanghai Jiaotong University(Agricultural Science)
基金
上海市科技兴农重点攻关项目(编号:沪农科攻字(2006)第4-9号)
关键词
百子莲
遮光
叶片结构
叶绿素含量
光合特性
A gapanthus praecox ssp. orientalis ‘Big Blue’
shading
leaf structure
pigment content
photosynthetic characteristics
